Historical and current usage of per- and polyfluoroalkyl substances (PFAS): A literature review

Fate of per- and polyfluoroalkyl substances through commercial composting facilities

Rising concerns about solid waste management globally necessitate the adoption of sustainable practices, particularly in dealing with organic waste, which constitutes a significant portion of municipal solid waste (MSW). Composting is an effective waste management strategy that can reduce both the environmental impact and greenhouse gas emissions of organic wastes, while producing valuable organic material (compost) for soil enhancement. However, the presence of persistent contaminants such as per- and polyfluoroalkyl substances (PFAS) in compost poses environmental and human health risks, challenging the sustainable management of organic wastes. This study investigates the fate of 33 PFAS compounds in two composting systems-windrow and in-vessel-focusing on the transformation and persistence of these compounds through the composting process, with the aim of collecting information which will support the identification of strategies to mitigate PFAS contamination in composting practices. The findings indicate significant reductions in total PFAS concentrations after composting, with reductions of 88.3% and 86.3% in the windrow and in-vessel systems, respectively. Notably, certain PFAS compounds, such as PFBS, appeared after composting, while PFPeA, became undetectable, suggesting potential leaching or transformation. Across both leachate and dust samples, PFAS concentrations were relatively low, with only a few compounds detected in each matrix. The final compost products met Australia's proposed NEMP 3.0 guidelines. However, considering the variation in PFAS content within similar categories of waste (feedstock), compliance with regulatory limits may vary. These results highlight the need for continued research into PFAS behaviour during composting and the development of best practices to mitigate contamination risks.

Neurotoxic effects of chronic exposure to perfluorobutane sulfonate in adult zebrafish (Danio Rerio)

Per and polyfluoroalkyl substances (PFAS) are synthetic compounds extensively utilized in industrial applications and consumer products. Long-chain PFAS has been linked to negative health impacts, prompting the introduction of shorter-chain alternatives like perfluorobutane sulfonate (PFBS). While long-chain PFAS are known to induce oxidative stress, neuroinflammation, and neuronal apoptosis, the neurotoxic potential of short-chain PFAS like PFBS was not well studied. This study aims to evaluate the neurotoxic effect and bioaccumulation of PFBS on adult zebrafish. In this study, adult zebrafish were exposed to PFBS at concentrations of 0.14, 1.4, and 14 μM for 28 days. PFBS accumulation in zebrafish brain tissue was confirmed by specific mass spectrum peaks. Behavioral assays revealed significant anxiety-like behavior, with PFBS (14 μM) exposed zebrafish spending more time in the bottom zone of the novel tank diving test (179.33 ± 1.03 s) and in the light and dark preference results showed increased time spent in the dark zone (165.17 ± 10.89 s). Learning and memory deficits were evident in the T-maze test, where PFBS-exposed zebrafish spent less time in the favorable zone (0.67 ± 1.15 s). Biochemical analysis showed significant inhibition of acetylcholinesterase (AChE) activity in the male and female brains (0.06 μmol/min and 0.09 μmol/min). Antioxidant enzyme levels were reduced, with superoxide dismutase (SOD) 5.45 U/mg protein in the male brain and 4.06 U/mg protein in the female brain, leading to increased oxidative stress biomarkers like lipid peroxidation and nitric oxide levels in male (0.99 μmol/mg/ml and 8.85 μM) and female brain (1.83 μmol/mg/ml and 8.74 μM), respectively. Gene expression analysis demonstrated the downregulation of SOD, CAT, GSR, and GPx, indicating impaired antioxidant defense mechanisms. Histopathological analysis of PFBS exposure groups revealed vacuolation and increased pyknotic neurons in the optic tectum region of the brain. Our study suggests that PFBS exposure leads to bioaccumulation in the brain, causing histopathological changes and cognitive impairment. In conclusion, PFBS induces neurotoxicity which can be a potential risk as they are incorporated into a range of consumer products.

A group of novel polyfluoroether substances affects lipid metabolism in human hepatocyte HepaRG cells less than classic perfluoroalkyl compounds

Per- and polyfluoroalkyl substances (PFAS) are used for numerous industrial applications including the production of fluorosurfactants. Some prominent PFAS, e.g., perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS), are non-degradable and therefore persist in the environment. They display various toxic properties including dysregulation of hepatic lipid metabolism. At the molecular level, these effects are mainly based on a PFAS-mediated activation of the peroxisome proliferator-activated receptor alpha (PPARα). A group of novel, degradable polyfluoroether compounds has been designed as building blocks for the production of alternative, degradable fluorosurfactants. In the present study, we examined the capacity of four of these novel polyfluoroether compounds to induce PPARα activation, increase intracellular triglyceride accumulation, and produce a cytotoxic response. In contrast to some classic PFAS including PFOA and PFOS, the novel compounds neither activated PPARα in a transactivation assay, nor did they induce expression of selected PPARα-dependent target genes in differentiated HepaRG cells, a model for human hepatocytes. They also did not induce triglyceride accumulation in HepaRG cells. The in vitro data indicate that the polyfluoroether compounds tested in the present study are not PPARα agonists. Since PPARα agonist activity is often associated with toxic responses, it can be assumed that these substances are less toxic than classic PFAS such as PFOA and PFOS, at least with respect to PPARα-dependent toxicity mechanisms.

PFAS removal via adsorption: A synergistic review on advances of experimental and computational approaches

Per- and polyfluoroalkyl substances (PFAS), commonly known as "forever chemicals", have become a major focus of current research due to their toxicity and persistence in the environment. These synthetic compounds are notoriously difficult to degrade, accumulating in water systems and posing long-term health and environmental risks. Adsorption is one of the most investigated technologies for PFAS removal. This review comprehensively reviewed the PFAS adsorption process, focusing not only on the adsorption itself, but also on the behavior of PFAS in the aquatic environment prior to adsorption because these behaviors directly affect PFAS adsorption. Significantly, this review summarized in detail the advances made in PFAS adsorption from the computational approach and emphasized the importance of integrated experimental and computational studies in gaining molecular-level understanding on the adsorption mechanisms of PFAS. Toward the end, the review identified several critical research gaps and suggested key interdisciplinary research needs for further advancing our understanding on PFAS adsorption.

High-Throughput Screening of Polyfluoroalkyl Substances Using Solid-Phase Microextraction Coupled to Microfluidic Open Interface-Mass Spectrometry

Efficient and sustainable methods for large-scale PFAS monitoring are critical for addressing environmental and public health challenges. This work presents a high-throughput sample preparation system capable of processing up to 48 samples simultaneously using solid-phase microextraction (SPME) and was directly coupled with mass spectrometry (MS) via an automated microfluidic open interface (MOI), bypassing the need for chromatographic separation. The SPME-MOI-MS approach achieves sensitive detection of 18 PFAS in drinking water, with limits of detection (LODs) between 1 and 10 pg/mL, using just 1.5 mL of sample and an average analysis time of 2.8 min per sample. The SPME blades, employed to enhance sensitivity in place of standard SPME fibers, incorporate a matrix-compatible coating material that enables effective PFAS screening in water as well as complex matrices including blood, beer, and beef. In addition, significantly low recovery and reproducibility of nonpolar PFAS in water analysis have been found and studied, indicating that using a glass container and adding a small percentage of acetonitrile can address this issue.

Sorption and mechanisms of legacy and emerging per- and polyfluoroalkyl substances (PFASs) on different particle size fractions of marine sediments

PFASs are ubiquitous in various environmental and biological media due to their extensive application and stability. However, the sorption of PFASs, especially emerging PFASs, on different particle size fractions of marine sediments remains unknown. Here, we investigated the sorption kinetics, isotherms, and mechanisms of six legacy and emerging PFASs on five different particle size fractions of marine sediments (F1 (69.4-190 μm), F2 (63.3-163 μm), F3 (5.25-72.6 μm), F4 (3.29-34.7 μm), and F5 (1.69-22.7 μm)). Our results indicated that the sorption kinetics and isotherms conformed well to the pseudo-second-order model and the Freundlich model, respectively, suggesting the nonlinear sorption of PFASs on marine sediments. The sorption capacities of PFASs decreased significantly with increasing sediment particle size from F5 to F1. Meanwhile, PFAS distribution coefficients (Kd) correlated positively with organic carbon content, specific surface area, and sediment pore volume. Kd values of PFOA and PFOS were 0.40-0.65 and 2.64-6.12 times higher than those of their substitutes, GenX and 6:2 FTSA. Hydrophobic interactions dominated PFAS sorption over electrostatic interactions. Overall, this study offers a comprehensive understanding of legacy and emerging PFAS distribution and mechanisms in marine sediments of varying particle sizes.

Interference of PFAS sorption on zeolites from natural water characteristics

Per- and polyfluoroalkyl substances (PFAS) are emerging anthropogenic pollutants of concern and are associated with potential human and environmental health concerns. PFAS removal can be achieved using adsorbents such as activated carbon and ion exchange resins. Recently, zeolites have been identified as another potential adsorption technology with increased selectivity and product regenerability that is not currently achieved with other adsorbents. Zeolite CP814E∗ (BEA) was tested in batch reactions for PFAS removal in different water matrix characteristics, including pH, select cations, humic acids (HA), fulvic acids (FA), and natural organic matter (NOM). In synthetic EPA waters, BEA performance increased compared to ultrapure water testing. BEA performance also significantly increased in the presence of Na+, Ca2+, and Mg2+ ions compared to ultrapure waters. PFOA and PFOS sorption did not vary significantly in the 6-9 pH range. HA, FA, and NOM did not significantly impact the sorption of PFOA and PFOS on the BEA at 1 g/L zeolite loading. One organic interferent, Suwannee River humic acids, did reduce PFOA sorption when the ratio of adsorbent to liquid was reduced to 0.1 mg/L. BEA retained sorption capacity over seven thermal regeneration cycles, and a BEA test with a real water demonstrated PFOA, PFOS and PFHxS adsorption at the parts per trillion level.

Assessment of per- and polyfluoroalkyl substances (PFAS) exposure and associations with oxidative stress biomarkers among pregnant women from the PROTECT cohort

INTRODUCTION

Per- and polyfluoroalkyl substances (PFAS) are synthetic chemicals linked with adverse pregnancy outcomes, yet they remain understudied in Puerto Rico. Moreover, underlying biological mechanisms of PFAS are not fully understood, although oxidative stress and inflammation are suspected pathways.

OBJECTIVES

We aimed to characterize PFAS exposure among pregnant women in Puerto Rico and examine associations between early to mid-pregnancy PFAS concentrations and repeated measures of oxidative stress biomarkers.

METHODS

This study included 434 participants enrolled in the PROTECT birth cohort. We analyzed serum samples (∼18 weeks of gestation) for nine PFAS, while urinary oxidative stress biomarkers [8-isoprostaglandin F2α (8-IsoP), its metabolite (IsoP-M), and prostaglandin F₂α (PGF2α)] were measured up to three times during pregnancy. We examined associations between each PFAS and oxidative stress biomarker using linear mixed effects regression models and multivariable regression analyses, adjusting for maternal demographic, socioeconomic, and study-related factors.

RESULTS

PFOS, PFNA, PFHxS, and PFOA were detected in over 50 % of participants, with PFOS being the most dominant. The majority of participants had total PFAS levels above 2 ng/mL. In repeated measures analyses, an interquartile range increase in PFHxS was associated with a 5.35 % (95 % CI: 0.12, 10.86) rise in IsoP-M levels. In categorical analyses, moderate levels of PFOS and PFNA were positively associated with PGF2α, while higher PFDeA was suggestively linked to 8-IsoP and IsoP-M.

CONCLUSIONS

Despite relatively modest levels compared to the U.S. NHANES, certain PFAS were positively linked with oxidative stress or inflammation, highlighting the need for broader investigations to examine PFAS-related alteration of inflammatory processes during pregnancy.

High-throughput screening of protein interactions with per- and polyfluoroalkyl substances (PFAS) used in photolithography

Per- and polyfluoroalkyl substances (PFAS) are synthetic chemicals used extensively across industries, including semiconductor manufacturing. Semiconductors are ubiquitous, and there is increasing global demand for semiconductors, e.g., for advanced technologies and the automotive industry. Despite their extensive use, the toxicity and bioaccumulation potential of PFAS used in photolithography, a critical process in semiconductor manufacturing, remain poorly understood. Moreover, most lack experimental data and standards for testing. Here, we identified 96 photolithography-relevant PFAS and developed a computational framework to evaluate their potential hazards through protein binding. By integrating molecular dynamics (MD) and docking, we predicted the binding affinities and positions of PFAS to five proteins-liver fatty acid binding protein (LFABP), serum albumin (SA), peroxisome proliferator-activated receptors α and γ (PPARα and PPARγ), and transthyretin (TTR). These proteins were chosen as their binding with PFAS has been linked to PFAS bioaccumulation and to hepatic, reproductive, developmental, and endocrine disruption. Comparisons with empirical data demonstrated our approach balances simulation speed and robustness, better estimating absolute and relative binding affinities than docking alone. PFAS-protein binding affinities were generally positively associated with fluorinated chain length and the presence of aromatic rings, but limited by the protein binding pocket dimensions. Notably, we identified 22 PFAS with stronger predicted binding than perfluorooctane sulfonic acid (PFOS), a known hazardous PFAS, to at least one target protein, suggesting the potential for toxicological concern. By enabling proactive evaluation of PFAS that are unavailable for experimental testing, this work contributes to safeguarding environmental and human health amidst rising semiconductor demands.

Early-pregnancy per- and polyfluoroalkyl substances and maternal post-pregnancy weight trajectory

OBJECTIVE

The objective of this study was to evaluate associations of early-pregnancy plasma per- and polyfluoroalkyl substances (PFAS) with maternal post-pregnancy weight trajectory parameters.

METHODS

We studied 1106 Project Viva participants with measures of early-pregnancy plasma concentrations of eight PFAS. We measured weight at in-person visits at 6 months and 3, 7, and 12 years after pregnancy and collected self-reported weight via annual questionnaires up to 17 years after pregnancy. Weight trajectory parameters were estimated via the Superimposition by Translation and Rotation model. We assessed individual and joint effects of PFAS with trajectory parameters using linear regression and Bayesian kernel machine regression (BKMR).

RESULTS

Perfluorooctane sulfonate (PFOS) concentrations were positively associated with weight trajectory magnitude in both linear regression (0.8 kg [95% CI: 0.1 to 1.4] per doubling of PFOS) and BKMR analyses (2.6 kg [95% CI: 1.4 to 3.8] per increase from 25th to 75th percentile of PFOS concentrations). Conversely, in BKMR analyses, perfluorononanoate was negatively associated with trajectory magnitude (-2.0 kg [95% CI: -2.9 to -1.1]). In stratified linear regression, older-aged participants had more pronounced positive associations of PFOS, perfluorooctanoate, and 2-(N-ethyl-perfluorooctane sulfonamido) acetate with weight trajectory velocity. No associations were observed with the overall PFAS mixture.

CONCLUSIONS

Select PFAS, assessed in pregnancy, may affect maternal weight trajectories spanning 17 years after pregnancy, especially for older-aged individuals.

Per- and polyfluoroalkyl substances (PFAS) exposure in the U.S. population: NHANES 1999-March 2020

Per- and polyfluoroalkyl substances (PFAS), also known as "forever chemicals" because of their persistence in the environment, have been used in many commercial applications since the 1940s. Of late, the detection of PFAS in drinking water throughout the United States has raised public and scientific concerns. To understand PFAS exposure trends in the general U.S. population, we analyzed select PFAS serum concentration data from participants ≥12 years old of nine National Health and Nutrition Examination Survey (NHANES) cycles. Our goals were to a) evaluate concentration changes of four legacy PFAS-perfluorohexane sulfonic acid (PFHxS), perfluorooctane sulfonic acid (PFOS), perfluorooctanoic acid (PFOA), and perfluorononanoic acid (PFNA) from 1999 to 2000 to 2017-March 2020, b) discuss serum concentrations and assess demographic predictors of two PFAS measured for the first time in 2017-2018, perfluoro-1-heptanesulfonic acid (PFHpS) and 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9CLPF), and c) compare concentration profiles of legacy PFAS in NHANES to profiles in exposed communities. We report a decrease in geometric mean concentrations of the four legacy PFAS (16%-87%, depending on the PFAS) from 1999 to 2000, although in 2017-March 2020, more than 96% of people aged 12-19 years, some of whom were born after PFAS production changes started in the early 2000s, had measurable concentrations of these PFAS. An estimated 78% of the U.S. general population had detectable concentrations of PFHpS, and 8% had detectable concentrations of 9CLPF (>44% of whom self-identified as Asian). Comparing profiles in NHANES and people living in communities with PFAS contamination can help identify exposure sources and evaluate and monitor exposures in select areas or among specific population groups. Collectively, our findings highlight the usefulness of NHANES data to help researchers, public health officials, and policy makers prioritize investigations, monitor exposure changes, and evaluate effectiveness of efforts to limit exposures.

INSIGHT: An integrated framework for safe and sustainable chemical and material assessment

The assessment of chemicals and materials has traditionally been fragmented, with health, environmental, social, and economic impacts evaluated independently. This disjointed approach limits the ability to capture trade-offs and synergies necessary for comprehensive decision-making under the Safe and Sustainable by Design (SSbD) framework. The EU INSIGHT project addresses this challenge by developing a novel computational framework for integrated impact assessment, based on the Impact Outcome Pathway (IOP) approach. Extending the Adverse Outcome Pathway (AOP) concept, IOPs establish mechanistic links between chemical and material properties and their environmental, health, and socio-economic consequences. The project integrates multi-source datasets (including omics, life cycle inventories, and exposure models) into a structured knowledge graph (KG), ensuring FAIR (Findable, Accessible, Interoperable, Reusable) data principles are met. INSIGHT is being developed and validated through four case studies targeting per- and polyfluoroalkyl substances (PFAS), graphene oxide (GO), bio-based synthetic amorphous silica (SAS), and antimicrobial coatings. These studies demonstrate how multi-model simulations, decision-support tools, and artificial intelligence-driven knowledge extraction can enhance the predictability and interpretability of chemical and material impacts. Additionally, INSIGHT incorporates interactive, web-based decision maps to provide stakeholders with accessible, regulatory-compliant risk and sustainability assessments. By bridging mechanistic toxicology, exposure modeling, life cycle assessment, and socio-economic analysis, INSIGHT advances a scalable, transparent, and data-driven approach to SSbD. This project aligns with the European Green Deal and global sustainability goals, promoting safer, more sustainable innovation in chemicals and materials through an integrated, mechanistic, and computationally advanced framework.

Per- and polyfluoroalkyl substances in environment and potential health impacts: Sources, remediation treatment and management, policy guidelines, destructive technologies, and techno-economic analysis

Per- and polyfluoroalkyl Substances (PFAS), also known as forever chemicals and ubiquitous persistence, pose significant public health challenges due to their potential toxicity, particularly in drinking water and soil contamination. However, PFAS occurrence and their concentrations in different environmental matrices vary globally, but factors influencing trends, transport, fate, toxicity, and interactions with co-contaminants remain largely unexplored. Therefore, this review critically examines the state-of-the-art worldwide PFAS sources, distribution, and pathways, and evaluates how PFASs are processed in wastewater treatment, generally, which causes severe problems with the quality and safety of drinking water. Importantly, the review also underscores health issues due to PFAS consumption and recent research trends on developing effective treatment strategies to manage PFAS contamination. Potential effects of PFAS were linked to urban land use and the proportion of wastewater effluent in streamflow. Besides, major emphasis was provided on challenges for conventional treatment, destructive technologies, environmental accumulation, precursor transformation, and cost-investment related to PFAS removal technologies. To combat PFAS contamination, this review proposes a framework that promotes the comprehensive identification of prevalent compounds, with a focus on their eradication through knowledge-based and targeted analysis. Additionally, it explores the ongoing debate surrounding PFAS laws and legal frameworks, offering ideas for enhancing contamination management. Lastly, this review provides a strategic plan for improving response and preparedness, serving as a foundation for addressing future environmental challenges and informing health risk assessments.

Perfluoroalkyl and Polyfluoroalkyl Substance Detection in Brewed Capsule Coffee

As food packaging materials are in direct contact with the food we eat and cook under heat or pressure, consumers are apprehensive of their adverse effects on the food products. Perfluoroalkyl and polyfluoroalkyl substances (PFASs) are often used in food packaging because of their hydrophobic properties; however, some PFASs are carcinogens, thus prompting further studies on their effects. In this study, a pretreatment method of 31 PFASs in coffee was established using the QuEChERS extraction method and analyzed by liquid chromatography-tandem mass spectrometry. We brewed 32 types of capsule coffee distributed in Korea, analyzed them for PFASs, and evaluated their safety. The results show that perfluorooctanoic acid and 8:2 fluorotelomer sulfonate levels are higher in machine-brewed capsule coffee than in capsule coffees brewed manually through a paper filter. However, the hazard quotient and excess cancer risk for all coffee samples are lower than the World Health Organization standards, and therefore, these samples are considered safe. The results of this study may aid in expanding the existing literature on PFAS detection in relation to human health.

Using Suction Lysimeters for Determining the Potential of Per- and Polyfluoroalkyl Substances to Leach from Soil to Groundwater: A Review

In-situ porewater samples were proposed to best represent the fraction of perfluoroalkyl and polyfluoroalkyl substances (PFAS) with the potential to migrate to groundwater. While there are many techniques for collecting porewater samples, suction lysimeters are frequently being used for PFAS investigations. Suction lysimeters use vacuum to extract porewater from vadose zone soils, typically fine to medium sands, which retain and release enough porewater for analysis. Importantly, determining the rate of PFAS migration to groundwater requires an independent measure of water percolation. This review covers the installation and sampling methods for suction lysimeters and provides suggestions to improve the utility and reduce the variability of the results. Because the volume of soil represented by the porewater sample varies significantly depending on the soil-water content, which is spatially and temporally variable, many suction lysimeters may be required to accurately represent soil heterogeneity. A similar limitation applies to soil or leaching protocol samples. Suction lysimeters may not provide a representative sample for all PFAS due to interactions with lysimeter materials, air-water interfaces, and the use of vacuum. Consequently, lysimeter data are best applied in combination with soil-leaching protocols, groundwater transects, and soil analysis when making remedial decisions.

Sensitive and accurate determination of 32 PFAS in human serum using online SPE-UHPLC-HRMS

Per- and polyfluoroalkyl substances' (PFAS) extreme persistence has been linked to many adverse effects on human health including increased risk of certain cancers. This study presents the development and validation of a new, highly sensitive method for the quantification of 32 PFAS in human serum using online solid-phase extraction (SPE) coupled with ultra-high performance liquid chromatography-high resolution mass spectrometry (UHPLC-HRMS). Legacy and emerging PFAS were targeted. Main steps of sample pretreatment include protein precipitation (PP), pellet rinsing, centrifugation, preconcentration through solvent evaporation, and online SPE using a weak anion-exchange polymeric sorbent. The PP and pellet-rinsing procedures were optimized through a comprehensive exploration of solvent combinations. Following this, a pretreatment that offers the best compromise for the targeted PFAS was identified using principal component analysis. The method demonstrated excellent linearity (R² = 0.977-0.997) with limits of quantification ranging from 8.9 to 27 ng/L, 5 to 15 times lower than previous methods. Precision (intraday 2.6-14.0 % and interday 1.3-11.0 % relative standard deviation) and accuracy (recoveries 72.7-106 %) were robust. The method was validated in accordance with ISO/IEC 17025 and successfully applied to five human serum samples, confirming its suitability for high-throughput profiling of PFAS in biomonitoring studies. This method is the first to use online SPE for the simultaneous determination of a broad range of PFAS, including ether congeners such as perfluoro(2-ethoxyethane) sulfonic acid and Nafion byproduct 2. Furthermore, control charts were employed to assess instrument performance during routine analysis and implement necessary actions.

Reproductive toxicity of perfluorobutane sulfonate in zebrafish (Danio rerio): Impacts on oxidative stress, hormone disruption and HPGL axis dysregulation

Per and polyfluoroalkyl substances (PFAS) are anthropogenic chemicals extensively used in consumer products. Perfluorobutane sulfonate (PFBS), a short-chain PFAS, has been introduced as an alternative to long-chain PFAS, but limited studies have investigated its reproductive toxicity in fish. In this study, adult zebrafish were exposed to PFBS at concentrations of 0.14, 1.4, and 14 μM for 28 days. PFBS accumulation in male and female gonads was confirmed by specific mass spectrum peaks detected in exposed samples. PFBS exposure at 14 μM significantly reduced egg production and hatching rates. The gonadosomatic index (GSI) was decreased by 73 % in males and 50 % in females compared to the control. PFBS impaired antioxidant enzyme activity, with superoxide dismutase (SOD) 4.73 U/mg protein in testes and 3.46 U/mg protein in ovaries, leading to elevated lipid peroxidation and nitric oxide levels in males (0.053 μmol/mg/ml and 5.65 μM) and females (0.047 μmol/mg/ml and 4.01 μM), respectively. PFBS exposure induced endocrine disruption through the hypothalamic-pituitary-gonadal-liver (HPGL) axis, showing increased estrogen (50 pg/g) in males and testosterone (181.6 pg/g) in females. Gene expression analysis revealed significant alteration in the HPGL axis, including cyp19b, er2b, fshb, lhb, 17βhsd, lhr, cyp19a, and vtg, indicating PFBS influence on sex hormone synthesis. Histopathological analysis of PFBS exposure groups revealed a reduction of spermatozoa in the testes and late vitellogenic oocytes in the ovaries. Overall, the result of the present study indicates that PFBS exposure induces oxidative stress, disrupts hormone synthesis, dysregulates HPGL axis gene expression, and causes reproductive toxicity in both male and female zebrafish.

Environment-wide association study of five per- and polyfluoroalkyl substance (PFASs) exposure pathways in Korean adolescents from the Korean National Environmental Health Survey (2018-2020)

Per- and polyfluoroalkyl substances (PFASs) are widely used in consumer products and are easily encountered in daily life. PFASs that accumulate in the human body can negatively affect adolescent health. This study aimed to identify key exposure pathways that influence serum PFAS levels in Korean adolescents, using data from the Korean National Environmental Health Survey (2018-2020) cycle 4. By employing an environment-wide association study, we assessed residential, lifestyle, and dietary factors associated with serum PFAS levels. Serum levels of five PFAS compounds-perfluorooctanoic acid, perfluorooctane sulfonate, perfluorohexane sulfonate, perfluorononanoic acid (PFNA), and perfluorodecanoic acid (PFDA)-were measured in 825 adolescents. Multivariable linear regressions were performed to explore the association between serum PFAS levels and 102 potential exposure-pathway variables. The Benjamini-Hochberg procedure was then applied to calculate false discovery rate-adjusted p-values, with values < 0.01 considered statistically significant. For internal validation, least absolute shrinkage and selection operator regression was conducted 3000 times. We found that frequent fish consumption (>once a week) was strongly associated with increased serum levels of PFNA and PFDA. Frequent consumption of shellfish (>once a month), crustaceans (>once a week), and vegetables (≥once a day) was associated with increased serum levels of PFDA. Living near roads with self-reported high traffic volume was linked to higher PFDA concentrations. Further research is necessary to assess additional exposure pathways and to develop effective strategies to minimize PFAS exposure during adolescence.

Forever Chemicals (PFAS): An Overview for Maternity and Pediatric Health Care Professionals

ABSTRACT

Per- and polyfluoroalkyl substances (PFAS) constitute a large class of chemicals with widespread exposure in the United States. They are commonly used in products because they repel water, stain, and grease. Concerns about the health impacts from PFAS exposures continue to grow as science has linked this chemical family with a wide range of health effects. A recent report by the Agency for Toxic Substances and Disease Registry (ATSDR, 2024), along with findings from the National Academies of Sciences, Engineering, and Medicine (NASEM, 2022), found sufficient evidence for the following health effects in children: decreased antibody response, dyslipidemia, and decreases in birthweight. For pregnant patients, health effects include gestational hypertension and preeclampsia. Some of these chemicals can pass through human breastmilk and when tested, are routinely found in umbilical cord blood and fetal organs (ATSDR, 2021). Concerns for human health prompted the U.S. Environmental Protection Agency (EPA) to recently regulate five different PFAS and combinations of them. We offer clinical perspectives based on the most current literature to reduce health effects including methods to reduce exposure, implications of lab testing, and clinical management considerations. This topic is important because of widespread human exposure. PFAS may bioaccumulate in humans; may increase cancer risk; have long half-lives in humans; and may affect the developing fetus and child. PFAS levels exceed EPA's Lifetime Health Advisory (LTHA) in drinking water in most states. An overview of this issue and related health concerns is presented in the context of implications for maternity and pediatric patients.

The introduction of nano zero-valent iron in constructed wetlands simultaneously enhanced the removal of perfluorooctanoic acid (PFOA) and nutrients

Constructed wetland (CW) serve as the final ecological barrier for hazardous materials entering the natural water environment. Due to the ecological toxicity and difficult bioutilization characteristics of perfluorooctanoic acid (PFOA) itself, CW technology faces great challenges in the field of PFOA remediation. In this study, nano zero-valent iron (nZVI) was introduced into CWs to explore the mechanism of the synergistic removal of PFOA and nutrients in nZVI-CW system. The results indicated that the addition of 10 mg/L nZVI improved the removal efficiency of CW for 1 and 10 mg/L PFOA, with an average removal rate increased by 3.53-8.70%. The transformation products in CW effluents were qualitatively detected using HPLC-Q-TOF-MS, suggesting that the degradation of PFOA may involve decarboxylation, hydrolysis, redox, elimination, substitution and intramolecular rearrangement processes. The presence of nZVI enhanced the average removal rates of NH4+-N, NO3--N and TP by 2.78-18.4% in CWs. The increase in key substrate enzyme activity confirmed the stimulating effect of nZVI on microbial activity. The addition of nZVI facilitated the growth and enrichment of hydroautotrophic denitrifying bacteria, nitrat-dependent iron-oxidizing bacteria, and dissimilatory iron-reducing bacteria. Two types of dissimilatory iron-reducing bacteria (Geobacter and Acinetobacter) may be potential PFOA-degrading bacteria. Additionally, signaling pathways related to carbohydrate metabolism, energy metabolism, and xenobiotic degradation and metabolism exhibited higher abundance in the nZVI treated groups.

Minimizing the Use of Per- and Polyfluoroalkyl Substances for Textured Wetting-Resistant Surfaces

Per- and polyfluoroalkyl substances (PFAS) have been used as synthetic chemicals to create textured wetting-resistant surfaces, which have a broad range of applications including omniphobic membranes, self-cleaning textiles, and anticorrosion coatings. However, the high persistence, toxicity, and bioaccumulation potential of PFAS have led to rising public concerns and stringent regulations, especially after the U.S. Environmental Protection Agency (USEPA) announced legally enforceable maximum contamination levels for six PFAS species in April 2024. In this paper, we provide our perspective that the use of PFAS can be avoided in the fabrication of textured omniphobic and superomniphobic surfaces, which display high wetting resistance against not only high surface tension liquids but also more importantly low surface tension liquids. We first discuss the role of PFAS in the design of conventional wetting-resistant surfaces. We then discuss the state-of-the-art strategies for creating PFAS-free textured omniphobic and superomniphobic surfaces with high wetting resistance while elucidating the underlying mechanism. Further, we emphasize that PFAS are indeed not always needed for textured surfaces with a sufficiently high wetting resistance in specific environmental applications such as desalination and wastewater treatment. We envision that this paper will motivate the scientific community to rethink and revolutionize the design framework toward more sustainable wetting-resistant surfaces, thereby circumventing the use of PFAS and the consequent health and environmental risks.

A High Efficiency Method for the Extraction and Quantitative Analysis of 45 PFAS in Whole Fish

This study describes and validates a new method for extracting perfluoroalkyl and polyfluoroalkyl substances (PFAS) from whole-body fish tissue, demonstrates that freeze-dry preservation of tissue conserves bioaccumulative PFAS, and details a method demonstration on Lake Michigan fish. While fish filets are more commonly analyzed for their significance to human health, whole fish are useful to determine ecological impacts, but published methods such as EPA 1633 do not produce reliable results for this more challenging matrix. Here we show that lipid removal technology produces clean extracts without the need for solid-phase extraction or evaporative concentration, which often lead to loss of some PFAS. This method achieves an accuracy of 96 ± 9% for the detection of 45 PFAS while also offering benefits of a simple procedure, reduced processing time, and decreased waste generation compared to multistep cleanup and concentration methods. A test of freeze-drying demonstrated that compounds detected in Great Lakes fish were retained, but volatile compounds including sulfonamide precursors and ethanols were lost. To demonstrate field performance, the entire method was applied to whole-fish composites from Lake Michigan. Results from these samples reveal that the PFAS concentration was driven by collection location, while the distribution of PFAS was dictated by fish species.

Critical role of pore size on perfluorooctanoic acid adsorption behaviors in carbonaceous sorbents

Per- and polyfluoroalkyl substances (PFAS) are an emergent threat to the environment due to their toxic, carcinogenic, and environmentally persistent nature. Commonly, these harmful micropollutants are removed from contaminated water sources through adsorption by porous sorbents such as activated carbon. While studies suggest a relationship between sorbent pore size and their PFAS remediation performance, the underlying mechanisms-particularly those related to sorbate morphology-have not been elucidated through direct experimental observations. This work investigates how pore size in carbonaceous sorbents impacts the morphology of adsorbed perfluorooctanoic acid (PFOA) aggregates and their sorption behavior, using microporous and mesoporous carbons as models. Contrast-matching small-angle neutron scattering (CM-SANS) is used to determine the structure of adsorbed PFOA molecules, supported by molecular dynamics simulations and physisorption experiments. Our findings reveal that the larger pore sizes in mesoporous sorbents enable the formation of PFOA assemblies during adsorption, which is hindered in microporous sorbents. Collectively, this work provides direct insights into the adsorption and assembly mechanisms of PFAS molecules within confined pores, offering important insights for the rational design of effective remediation systems.

Non-Invasive Matrices for the Human Biomonitoring of PFAS: An Updated Review of the Scientific Literature

Per- and polyfluoroalkyl substances (PFAS) are synthetic chemicals widely used in consumer and industrial products due to their unique physicochemical properties. However, their persistence and bioaccumulative potential pose significant environmental and human health risks. This review focuses on the use of non-invasive matrices-urine, hair, and nails-for the human biomonitoring of PFAS, highlighting key findings from scientific studies. While urine offers a non-invasive and practical option, its limited sensitivity for long-chain PFAS requires further analytical advances. Hair and nails have demonstrated potential for use in biomonitoring, with higher detection frequencies and concentrations for certain PFAS compared to urine. The variability in PFAS levels across studies reflects differences in population characteristics, exposure sources, and geographic regions. This review emphasizes the need for standardized analytical methods, expanded population studies, and the use of complementary matrices to enhance the accuracy and reliability of PFAS exposure assessment.

Suspect and Nontarget Analysis of Per- and Polyfluoroalkyl Substances in Groundwater Underlying Different Land-Use Areas

Groundwater can be contaminated by PFAS emissions, yet research on the presence and associated risks of PFAS in groundwater underlying different land-use areas remains limited. Herein, high-resolution mass spectrometry-based suspect and nontarget analyses were performed to determine PFAS occurrence in groundwater samples obtained from a rural area, a planting region, and the vicinities of a pharmaceutical park, an airport, and an industrial park in Datong City, China. A total of 31 PFAS (16 emerging and 15 legacy PFAS) were identified, and the ΣPFAS concentrations ranged from 0.775 (rural area) to 80.7 ng/L (pharmaceutical park). In terms of the average concentration of ΣPFAS, legacy PFAS were predominant in rural groundwater, whereas emerging PFAS were predominant in the other four land-use areas. PFOA, PFDA, PFUnDA, and 6:2 FTS were detected in all groundwater samples. To further prioritize the risk of identified PFAS in groundwater, the detection frequency; concentration; and persistence, bioaccumulation, and toxicity attributes were adopted, which showed that high-risk compounds varied across different land-use areas. Our results further reveal the ubiquitous contamination of PFAS in groundwater environments, even in areas with limited human activity, and highlight the necessity of suspect and nontarget analysis for assessing PFAS exposure through groundwater.

Design, New Materials, and Production Challenges of Bioplastics-Based Food Packaging

This paper outlines the current design trends in food packaging, its main environmentally friendly material alternatives, and industrial processing technologies. In this respect, this important product has undergone several evolutions throughout history. Initially acting as a containment device, it has later evolved into a source of information and even a marketing platform for food companies, always with a view to extending shelf life. However, these functionalities are highly dependent on the materials used and their properties. In this respect, plastics have conquered the food packaging market due to their affordability and flexibility. Nevertheless, environmental concerns have arisen due to their impact on the environment, in addition to the introduction of stricter industry regulations and increased consumer environmental awareness. Therefore, this work found that the current design trends in food packaging are toward sustainability, reducing packaging complexity, with easier recycling, and material selection that combines both sustainability and functionality. In the case of bioplastics as a sustainable alternative, there is still room for improvement in their production, with careful consideration of their raw materials. In addition, their technical performance is generally lower, with challenges in barrier properties and processability, which could be addressed with the adoption of Industry 4.0.

Occurrence and distribution of brominated and fluorinated persistent organic pollutants in surface sediments focusing on industrially affected rivers

This study investigated legacy persistent organic pollutants, including polybrominated diphenyl ethers (PBDEs), hexabromocyclododecanes (HBCDs), and per- and polyfluoroalkyl substances (PFAS), as well as their alternatives, in sediments from five major rivers, to assess their contamination status and usage patterns. The concentration levels of ΣPBDEs (median 9.98 ng/g dry weight (dw), mean 190 ng/g dw), ΣHBCDs (median 9.35 ng/g dw, mean 39.8 ng/g dw), Σnovel brominated flame retardants (NBFRs) (median not detected, mean 821 ng/g dw), and ∑PFAS (median 1.14 ng/g dw, mean 13.9 ng/g dw) in river sediments affected by high industrial activity were statistically significantly higher than at other sites with less or no industrial activity (Kruskal-Wallis test, p < 0.05). The dominant compounds among legacy substances for brominated flame retardants (BFRs) and PFAS are decaBDE for PBDEs, γ-HBCD for HBCDs, and perfluorooctane sulfonate (PFOS) for PFAS. The detection frequencies of 1,2-Bis(2,4,6-tribromophenoxy)ethane (BTBPE) and 6:2 chlorinated perfluoroalkylether sulfonic acid (F53B), as alternative substances for PBDEs and PFOS, were 16% and 9%, respectively. Regarding substances used as alternatives for perfluorooctanoic acid (PFOA) were detected at only one site for hexafluoropropylene oxide dimer acid (Gen-X), while 4,8-dioxo-3H-perfluorononanoic acid (ADONA) was not detected. The hazard quotient (HQ) values from the ecological risk assessment were generally low (HQ < 1), except for ΣPBDEs and PFOS at several sites. The present study emphasizes the need for continuous monitoring and risk assessment of these pollutants in river sediments, particularly in industrial areas, and highlights the importance of addressing the ecological toxicity of these substances to safeguard aquatic ecosystems.

Pillar[5]arene-based Polymer Network for Efficiently Removing Perfluorooctanoic Acid through Synergistic Binding Interactions

Perfluorooctanoic acid (PFOA) is currently one of the most important chemicals posing environmental risks, and there is an urgent need to find methods to efficiently remove PFOA from environmental media. Here, two decaamino-pillar[5]arene-based fluorine-rich polymer networks, called FA2P-P and FA6P-P, were constructed using a convenient method. FA6P-P had an excellent ability to take up PFOA, and had a capacity of 1423 (mg PFOA) (g FA6P-P)-1, which is the second highest adsorption capacity reported for any PFOA sorbent. FA6P-P removed >99 % of the PFOA from a solution and decreased the PFOA concentration from 1000 μg L-1 in 5 min at an exceedingly low adsorbent loading of 0.7 mg L-1, giving a final PFOA concentration <4 ng L-1, which is lower than the most recent enforceable maximum concentration set by the United States Environmental Protection Agency. A high rate constant (kobs) of 55.8 g mg-1 h-1 was observed. Pillar[5]arene gives the material hydrophobic properties and also amino sites and hydrophobic chains, which are synergistic PFOA binding sites. The polymer was very stable and readily regenerated. The results indicated that pillar[5]arene-based porous organic polymer sorbents are excellent candidates for capturing PFOA.

Multidimensional library for the improved identification of per- and polyfluoroalkyl substances (PFAS)

As the occurrence of human diseases and conditions increase, questions continue to arise about their linkages to chemical exposure, especially for per-and polyfluoroalkyl substances (PFAS). Currently, many chemicals of concern have limited experimental information available for their use in analytical assessments. Here, we aim to increase this knowledge by providing the scientific community with multidimensional characteristics for 175 PFAS and their resulting 281 ion types. Using a platform coupling reversed-phase liquid chromatography (RPLC), electrospray ionization (ESI) or atmospheric pressure chemical ionization (APCI), drift tube ion mobility spectrometry (IMS), and mass spectrometry (MS), the retention times, collision cross section (CCS) values, and m/z ratios were determined for all analytes and assembled into an openly available multidimensional dataset. This information will provide the scientific community with essential characteristics to expand analytical assessments of PFAS and augment machine learning training sets for discovering new PFAS.

Sources and Pathways of PFAS Occurrence in Water Sources: Relative Contribution of Land-Applied Biosolids in an Agricultural Dominated Watershed

This study evaluated PFAS occurrence in rural well water and surface water relative to land application of biosolids in a tile-drained agriculture-dominated watershed. Spatial data were used to identify potentially vulnerable rural wells based on their proximity to biosolid-permitted land and location with respect to groundwater flow. Water was collected from 103 private wells in Greater Tippecanoe County Indiana and 168 surface water locations within the Region of the Great Bend of the Wabash River watershed. Overall, results indicate that surface water (∑PFAS ≤ 169.4 ng/L) is more vulnerable to PFAS contamination than well water (∑PFAS ≤ 15.7 ng/L). Short-chain perfluoroalkyl acids made up 72% of the ∑PFAS in both water sources. Nonetheless, long-chain homologues were detected more frequently in surface water (94%) than well water (82%). Hierarchical cluster analysis identified biosolid-applied fields, WTTPs, and industrial discharges as PFAS sources in first-order streams with high ∑PFAS. Temporal trends revealed an inverse relationship between streamflow and concentrations in surface water sites impacted by point discharges and vice versa for diffuse sources, thereby providing complementary evidence of potential sources. The well water data set did not show a distinct spatial trend between ∑PFAS and distance from biosolid application or well characteristics.

Broad PFAS binding with fatty acid binding protein 4 is enabled by variable binding modes

Per- and polyfluoroalkyl substances (PFAS) are ubiquitous pollutants that bioaccumulate in wildlife and humans, yet the molecular basis of their protein interactions remains poorly understood. Here, we show that human adipocyte fatty acid-binding protein (FABP4) can bind a diverse array of PFAS, including next-generation replacements for legacy chemicals and longer-chain perfluorocarboxylic acids. Shorter-chain PFAS, although weaker binders, still displayed measurable affinities-surpassing those of their nonfluorinated analogs. We determined crystal structures of FABP4 bound to perfluorooctanoic acid (PFOA), perfluorodecanoic acid (PFDA), and perfluorohexadecanoic acid (PFHxDA), revealing three distinct binding modes. Notably, PFOA binds in two separate sites, and two distinct conformations define single-ligand binding of PFDA and PFHxDA. These arrangements enhance hydrophobic interactions within the binding cavity and likely explain the low micromolar dissociation constants observed in fluorescence competition assays. Our findings underscore the critical roles of chain length, headgroup functionality, and protein conformation in PFAS-FABP4 interactions. Given the emerging implications of the role of FABP4 in endocrine function, even subtle PFAS-induced perturbations could affect metabolic regulation and disease risk. Overall, this work highlights the value of direct structural and biochemical insights into PFAS-FABP4 interactions and paves the way for future research on PFAS transport and toxicological outcomes.

Phytoremediation of perfluoroalkyl and polyfluoroalkyl substances (PFAS): Insights on plant uptake, omics analysis, contaminant detection and biomass disposal

The unique properties of per- and polyfluoroalkyl substances (PFAS) have driven their pervasive use in different industrial applications, leading to substantial environmental pollution and raising critical concerns about the long-term impacts on ecosystem and human health. To tackle the global challenge of PFAS contamination, there is an urgent need for sustainable and efficient remediation strategies. Phytoremediation has emerged as a promising eco-friendly approach with the potential to mitigate the spread of these persistent contaminants. However, addressing this complex issue requires interdisciplinary cutting-edge research to develop comprehensive and scalable solutions for effective PFAS management. This review highlights recent advancements in the detection, quantification, and monitoring of PFAS uptake by plants, providing a detailed description of PFAS accumulation in several plant species. Besides, the physiological and molecular responses elicited by these pollutants are described. Leveraging omic technologies, including genomics, transcriptomics, and proteomics, provides unprecedented insights into the plant-PFAS interaction. Novel approaches based on artificial intelligence to predict this interaction and up to date disposal and valorization methods for PFAS-contaminated plant biomass, are discussed here. This review offers an interdisciplinary approach to explore what has been discovered so far about PFAS phytoremediation, covering the entire process from contaminant uptake to sustainable disposal, providing a roadmap for future research.

Associations between per-and polyfluoroalkyl substances (PFAS) and county-level cancer incidence between 2016 and 2021 and incident cancer burden attributable to PFAS in drinking water in the United States

BACKGROUND

Exposure to per- and polyfluoroalkyl substances (PFAS) has been linked with various cancers. Assessment of PFAS in drinking water and cancers can help inform biomonitoring and prevention efforts.

OBJECTIVE

To screen for incident cancer (2016-2021) and assess associations with PFAS contamination in drinking water in the US.

METHODS

We obtained county-level age-adjusted cancer incidence (2016-2021) from the Surveillance, Epidemiology, and End Results (SEER) Program. Data on PFAS levels in public drinking water systems were obtained from the Third (UCMR3; 2013-2015) and Fifth (UCMR5; 2023-2024) Unregulated Contaminant Monitoring Rule. UCMR3 measured PFOS, PFOA, PFNA, PFHxS, PFHpA, and PFBS. UCMR5 expanded measurements to include PFBA, PFHxA, PFPeA, and PFPeS. We created indicators of PFAS detection and, for UCMR5, concentrations above Maximum Contaminant Levels (MCLs). MCLs for PFOA and PFOS are 4 ng/L, and for PFNA and PFHxS are 10 ng/L. We used Poisson regression models to assess associations between PFAS detection or MCL violation and cancer incidence, adjusting for potential confounders. We estimated the number of attributable cancer cases.

RESULTS

PFAS in drinking water was associated with increased cancer incidence in the digestive, endocrine, oral cavity/pharynx, and respiratory systems. Incidence rate ratios (IRRs) ranged from 1.02 to 1.33. The strongest association was observed between PFBS and oral cavity/pharynx cancers (IRR: 1.33 [1.04, 1.71]). Among males, PFAS was associated with cancers in the urinary, brain, leukemia, and soft tissues. Among females, PFAS was associated with cancers in the thyroid, oral cavity/pharynx, and soft tissue. PFAS in drinking water is estimated to contribute to 4626 [95% CI: 1,377, 8046] incident cancer cases per year based on UCMR3 data and 6864 [95% CI: 991, 12,804] based on UCMR5.

IMPACT STATEMENT

The ecological study examined the associations between PFAS in drinking water measured in two waves (2013-2015 and 2023-2024) and cancer incidence between 2016 and 2021. We found that PFAS in drinking water was associated with cancers in the organ system including the oral cavity/pharynx, lung, digestive system, brain, urinary system, soft tissue, and thyroid. Some cancers have not been widely studied for their associations with PFAS. We also observed sex differences in the associations between PFAS and cancer risks. This is the first ecological study that examined PFAS exposure in drinking water and various cancer risks.

Challenges Associated With PFAS Detection Method in Africa

Per- and polyfluoroalkyl substances (PFAS) are a group of man-made chemicals that are widely present in many industries. Monitoring and analyzing PFAS in Africa is challenging due to the limited availability of mass spectrometry (MS), which is an essential technique for detecting PFAS. This review assesses the scope and impact of the shortage of mass spectrometry instruments in Africa, emphasizing the resulting limitations in monitoring environmental and public health threats. The review analyzes the existing PFAS monitoring, the accessibility of MS instruments, and the technical capabilities within the continent. This study suggests that fewer African countries have sufficient MS instruments, resulting in significant underreport of environmental data and related public health issues. The review proposes financial support and programs to address these difficulties to provide necessary MS instruments. The review suggests that it is highly important to develop regional centers of excellence for PFAS monitoring using MS instruments and investing in training programs to address the gap in monitoring efforts. So, enhancing these are crucial for the successful management of the environment and safeguarding public health from the effects of PFAS contamination.

PFAS fate using lysimeters during degraded soil reclamation using biosolids

Carbon- and nutrient-rich biosolids are used in agriculture and land reclamation. However, per- and polyfluoroalkyl substances (PFAS) typically present in biosolids raise concerns of PFAS leaching to groundwater and plant uptake. Here, we investigated PFAS persistence and leaching from biosolids applied to a site constructed artificially to mimic degraded soils. Treatments included biosolids and biosolids blended with mulch applied at different rates to attain either one and five times the agronomic N rate for vegetable crops and a control treatment with synthetic urea and triple superphosphate fertilizer. Leachates were collected for a 2-year period from 15-cm depth zero-tension drainage lysimeters. Soils were analyzed post biosolids application. PFAS were quantified using isotope-dilution, solid-phase extraction and liquid chromatography tandem mass spectrometry. Leachate profiles exemplified an initial high total PFAS concentration, followed by a sharp decline and subsequent small fluctuations attributed to pre-existing soil conditions and rainfall patterns. Quantifiable PFAS in leachate were proportional to biosolids application rates. Short-chain perfluoroalkyl acids (CF2 < 6) were dominant in leachate, while the percentage of longer chains homologues was higher in soils. A 43% biosolids blend with mulch resulted in 21% lower PFAS leachate concentrations even with the blend application rate being 1.5 times higher than biosolids due to the blend's lower N-content. The blending effect was more pronounced for long-chain perfluoroalkyl sulfonic acids that have a greater retention by soils and the air-water interface. Biosolids blending as a pragmatic strategy for reducing PFAS leachate concentrations may aid in the sustainable beneficial reuse of biosolids.

Surveillance of PFAS in sludge and biosolids at 12 water resource recovery facilities

Per- and polyfluoroalkyl substances (PFAS) are refractory anthropogenic chemicals and current treatment processes at municipal water resource recovery facilities (WRRFs) cannot efficiently degrade them, hence, these chemicals cycle through the environment. Certain PFAS can be concentrated in biosolids from WRRFs and are commonly land applied for beneficial reuse. Given recent advances in measurement of PFAS, documentation of the range of concentrations in pre-stabilized sludge and stabilized biosolids is critical to evaluating treatment best practices and assessing potential human health and ecological risks. In this study, pre-stabilized sludge and post-stabilized biosolids samples were collected from 12 major WRRFs across the United States. PFAS were analyzed using Environmental Protection Agency (EPA) Method SW846-3500C/537.1, and Draft EPA Method 1633, by one commercial laboratory and two university research laboratories, respectively. Results comparison among laboratories demonstrated statistical differences in PFAS concentrations among split samples. For example, 5:3 FTCA (fluorotelomer carboxylic acid) concentrations in post-stabilized sludge at Lab 1 were measured at 21 ng/g (dry), while they were detected at 151 ng/g (dry) in Lab 3. Further, higher PFAS concentrations were observed in post-stabilized biosolids compared to pre-stabilized sludges, regardless of the laboratory or analysis method, even when solids destruction through solids stabilization was considered. Further research is required to refine methods for analyses of PFAS in sludge and biosolids samples from WRRFs prior to being used for development of regulatory actions as well as understanding how various treatment protocols could impact concentrations of PFAS in land-applied biosolids.

Synthesis of Homoallylamine Covalent Organic Frameworks Via Hosomi-Sakurai Reaction Under Mild Conditions

One-pot multicomponent reactions (MCRs) are a valuable strategy to synthesize functional covalent organic frameworks (COFs) in a single step. Most reported COF syntheses involve solvothermal processes, and because of the harsh reaction conditions, such as high temperature or high pressure, large-scale production of COFs has been limited. The synthesis of homoallylamine substituted COFs via a one-pot Hosomi-Sakurai reaction is reported. At room temperature the reaction of allyltriethylgermane with either terephthalaldehyde or [1,1'-biphenyl]-4,4'-dicarbaldehyde, and 1,3,5-tris(4-aminophenyl)benzene (TAPB) is catalyzed by Sc(OTf)3 to produce two COFs: TAPB-1P-Allyl COF and TAPB-BP-Allyl COF. The allyl functionalized COFs shows high crystallinity, with micropores ranging from 3.2 to 3.9 nm, for TAPB-1P-Allyl COF and TAPB-BP-Allyl COF respectively, and both COFs are hydrolytically stable at different pH levels. Post-synthetic modification of these COFs with iodomethane produces methylated cationic COFs that demonstrates >98% adsorption efficiencies below the detection limit of perfluorooctanoic acid (PFOA) and perfluorodecanoic acid (PFDA) from aqueous solutions. After four cycles adsorption efficiency remains high with concentrations of PFOA below the detection limit.

Perfluoroalkyl substances (PFASs) in groundwater and surface water in the Turin metropolitan area (Italy): An attempt to unravel potential point sources and compliance with environmental/drinking water quality standards

The study investigated the contribution of five potential point source categories on the occurrence of 19 highly hazardous perfluoroalkyl substances (PFASs) in freshwater from the Turin metropolitan area (Italy) and assessed the quality of groundwater and surface water in compliance with European and Italian guidelines. PFASs were revealed in 29 and 24 % of the investigated shallow (unconfined aquifers) and deep (semi- and confined aquifers) wells with a total concentration, as a sum (ΣPFASs), of 0.01-0.71 and 0.01-0.16 μg/L, respectively. The PFAS occurrence in shallow groundwaters appeared more related to (potentially-) contaminated and reclaimed areas, landfills and waste management plants rather than plants subjected to integrated environmental authorisations and wastewater treatment plants. Overall, PFAS occurrences increased with the degree of industrialisation and urbanisation in both unconfined and (semi-) confined aquifers. PFASs were found in 96 % of the sampling sites in streams with ΣPFASs values of 0.0002-0.47 μg/L, whilst they do not occur in the investigated lake. A slight correlation was found between wastewater treatment plants and the occurrence of PFASs in streams. The annual ΣPFASs loads downstream of the Turin metropolitan Area were estimated around 150-220 kg. Exceedances of the environmental and drinking water quality standards of Italy and Europe were frequently revealed.

Examining disparities in PFAS plasma concentrations: Impact of drinking water contamination, food access, proximity to industrial facilities and superfund sites

BACKGROUND

Most of the US population is exposed to per- and polyfluorinated substances (PFAS) through various environmental media and these sources of PFAS exposure coupled with disproportionate co-localization of PFAS-polluting facilities in under-resourced communities may exacerbate disparities in PFAS-associated health risks.

METHOD

We leveraged two cohorts in Southern California with 8 PFAS concentrations measured in plasma. We obtained PFAS water testing data from the Third Unregulated Contaminant Monitoring Rule and state monitoring data, census tract-level information on food access using the Food Access Research Atlas, the location of Superfund sites on the National Priorities List, and data on facilities known to release PFAS pollutants. These data were then spatially linked to the participants' home addresses.

RESULTS

In the first cohort, we found that detections of PFOS, PFOA, and PFHxS in drinking water were associated with 1.54 ng/mL (95% CI: 0.77, 2.32), 0.47 ng/mL (0.25, 0.68), and 1.16 ng/mL (0.62, 1.71) increase in plasma PFOS, PFOA, and PFHxS. The presence of Superfund sites was associated with higher plasma concentrations of PFOS, PFHxS, PFPeS, and PFHpS (betas [95% CIs]: 0.96 [0.21, 1.71], 0.9 [0.22, 1.58], 0.04 [0.02, 0.06] and 0.05 [0.02, 0.09], respectively). Each additional PFAS-polluting facility present in the neighborhood was associated with a 0.9 ng/mL (0.03, 0.15) increase in the concentration of PFOS. In the other cohort, we found that the presence of Superfund sites was associated with higher plasma PFDA, PFHpS, PFOS (betas [95% CIs]: 0.03 [0.01, 0.06], 0.05 [0.01, 0.09], and 1.96 [0.31, 3.62]). Neighborhood low access to food was associated with a 2.51 ng/mL (0.7, 4.31) increase in plasma PFOS, 0.6 ng/mL (0.16, 1.06) increase in plasma PFOA and 0.06 (0.02, 0.1) increase in plasma PFHpS.

CONCLUSION

Reducing sources of PFAS exposure in under-resourced neighborhoods may help reduce disparities in human exposure levels.

Elucidating governing factors of PFAS removal by polyamide membranes using machine learning and molecular simulations

Per- and polyfluoroalkyl substances (PFASs) have recently garnered considerable concerns regarding their impacts on human and ecological health. Despite the important roles of polyamide membranes in remediating PFASs-contaminated water, the governing factors influencing PFAS transport across these membranes remain elusive. In this study, we investigate PFAS rejection by polyamide membranes using two machine learning (ML) models, namely XGBoost and multimodal transformer models. Utilizing the Shapley additive explanation method for XGBoost model interpretation unveils the impacts of both PFAS characteristics and membrane properties on model predictions. The examination of the impacts of chemical structure involves interpreting the multimodal transformer model incorporated with simplified molecular input line entry system strings through heat maps, providing a visual representation of the attention score assigned to each atom of PFAS molecules. Both ML interpretation methods highlight the dominance of electrostatic interaction in governing PFAS transport across polyamide membranes. The roles of functional groups in altering PFAS transport across membranes are further revealed by molecular simulations. The combination of ML with computer simulations not only advances our knowledge of PFAS removal by polyamide membranes, but also provides an innovative approach to facilitate data-driven feature selection for the development of high-performance membranes with improved PFAS removal efficiency.

Toxic layering and compound extremes: Per- and polyfluoroalkyl substances (PFAS) exposure in rural, environmental justice copper mining communities

Per- and polyfluoroalkyl substances (PFAS) are pervasive environmental pollutants with significant impacts on ecosystems and public health. This study aimed to characterize PFAS concentrations in an environmental justice community impacted by active/legacy copper mining, compounded by wildfires and flash floods. Additionally, the study explored the (re)mobilization of PFAS and co-occurrence with metal(loid)s following these events. Twenty-eight PFAS compounds in 35 residential and 8 control surface soil samples were analyzed via liquid chromatography-tandem mass spectrometry (LCMS/MS). The maximum total PFAS concentration observed in the residential samples was 96.40 μg kg-1, compared to 1.69 μgkg-1 in the control samples. Perfluorobutanoic acid (PFBA) had a maximum concentration of 61 μg kg-1 in residential samples, while Perfluorohexane sulfonic acid (PFHxS) had the highest concentration in the control samples at 0.92 μg kg-1. Long-chain PFAS were most dominant in this study. Perfluorooctane sulfonic acid (PFOS) (58 % of the samples), Perfluorooctanoic acid (PFOA) (35 %), and Perfluorohexane sulfonic acid (PFHxS) (72 %) exceeded the U.S. EPA Soil-to-Groundwater Risk-Based Screening Levels, highlighting the potential risk of contaminants migrating from soil to groundwater, which could ultimately impact groundwater quality. Co-occurrence analysis showed that increases in PFAS concentrations were positively associated with Zn (β = 1.25, p = 0.0034) and Ba (β = 1.23, p = 0.0284) but negatively associated with Pb (β = -0.83, p = 0.0115) and Co (β = -1.38, p = 0.04671). In general, a spatial distribution map indicated that greater PFAS concentrations were observed near potential sources i.e., active mines. This evidence combined with select metal co-occurrence highlights the potential role of mining activities on PFAS concentration.

Considerations for Measurements of Aggregate PFAS Exposure in Precision Environmental Health

Per- and polyfluoroalkyl substances (PFAS) have become a major focus of research due to their widespread environmental presence and adverse health effects associated with human exposure. PFAS include legacy and emerging structures and are characterized by a range of functional groups and carbon-fluorine chains that vary in length (from fewer than 3 carbons to more than 7 carbons). Research has linked PFAS exposure to an array of health concerns, ranging from developmental and reproductive disorders to immune system impairments and an increased risk of certain cancers. In this new era of personalized health, measuring markers of PFAS exposure in human biospecimens is an important part of environmental public health surveillance. PFAS are typically measured in human blood and tissues using targeted approaches, which quantify individual PFAS structures using specific instrumentation. The diversity and complexity of PFAS, the limitations of the targeted approaches due to the sheer number of structures, and the absence of publicly available analytical standards pose significant challenges for measurement methodologies. This perspective aims to describe aggregate PFAS exposure measurements and their potential for use in precision medicine applications including a discussion of the limitations and potential benefits of these aggregate measurements. As public health organizations, healthcare professionals, and the public look for guidance regarding the safe use of and exposure to PFAS, in a pragmatic cost-effective manner, the dynamic field of measurement science is poised to respond with innovative technological solutions to an important public health need.

Exposure to PFOA, PFOS, and PFHxS induces Alzheimer's disease-like neuropathology in cerebral organoids

Per- and polyfluoroalkyl substances (PFASs), a class of ubiquitous synthetic organic chemicals, are widely utilized across various industrial applications. However, the long-term neurological health effects of PFAS mixture exposure in humans remain poorly understood. To address this gap, we have designed a comprehensive study to predict and validate cell-type-specific neurotoxicity of PFASs using single-cell RNA sequencing (scRNA-seq) and cerebral organoids. Cerebral organoids were exposed to a PFAS mixture at concentrations of 1 × (10 ng/ml PFOS and PFOA, and 1 ng/ml PFHxS), 30 × , and 900 × over 35 days, with a follow-up analysis at day 70. Pathological alterations and lipidomic profiles were analyzed to identify disrupted molecular pathways and mechanisms. The scRNA-seq data revealed a significant impact of PFASs on neurons, suggesting a potential role in Alzheimer's Disease (AD) pathology, as well as intellectual and cognitive impairments. PFAS-treated cerebral organoids exhibited Aβ accumulation and tau phosphorylation. Lipidomic analyses further revealed lipid disturbances in response to PFAS mixture exposure, linking PFAS-induced AD-like neuropathology to sphingolipid metabolism disruption. Collectively, our findings provide novel insights into the PFAS-induced neurotoxicity, highlighting the significance of sphingolipid metabolism in the development of AD-like neuropathology. The use of cerebral organoids and scRNA-seq offers a powerful methodology for evaluating the health risks associated with environmental contaminants, particularly those with neurotoxic potential.

Kidney toxicology of a novel compound Lithium Bis(trifluoromethanesulfonyl)imide (LiTFSI, ie. HQ-115) used in energy applications: An epigenetic perspective

Exposure to emerging energy-based environmental contaminants such as lithium bis(trifluoromethanesulfonyl)imide (LiTFSI, trade name HQ-115), poses a significant threat to human health, yet its impact on kidney function and epigenetic regulation remains poorly understood. Here, we investigated the effects of LiTFSI exposure on kidney-related biochemical indicators, renal injuries, and epigenetic alterations in male CD-1 mice under both 14-day and 30-day exposure durations. Our study revealed that LiTFSI exposure led to changes in kidney-related markers, notably affecting serum bicarbonate levels, while relative kidney weight remained unaffected. Histological analysis revealed tubule dilation, inflammation, and loss of kidney structure in LiTFSI-exposed mice, alongside dysregulated expression of genes associated with inflammation, renal function, and uric acid metabolism. Epigenetic analysis further identified widespread DNA methylation changes in the two exposure regimes. Functional analysis revealed that differentially methylated regions are implicated in cell apoptosis and cancer-related pathways and are enriched with development-related transcription factor binding motifs, suggesting a potential mechanism of action underlying exposure induced kidney damage. These findings underscore the intricate interplay between environmental exposures, epigenetic modulation, and kidney health, emphasizing the need for additional research to unravel precise mechanisms and develop targeted interventions to mitigate the adverse effects of LiTFSI and exposure of similar clean energy compounds on human health.

Per- and poly-fluoroalkyl substances exposure and risk of gastrointestinal cancers: a systematic review and meta-analysis

BACKGROUND

Per- and poly-fluoroalkyl substances (PFASs) are a group of synthetic chemicals used since the 1940s in industrial and consumer applications. These substances are known or suspected to cause cancer, particularly kidney and testicular cancer. However, their association with other types of cancer is not well understood. This review aims to investigate the link between PFAS exposure and the risks of other cancers, including gastrointestinal cancers such as esophageal, gastric, colorectal, and pancreatic cancer.

METHODS

We conducted a systematic review of literature from the International Agency for Research on Cancer Monographs, Agency for Toxic Substances and Disease Registry documents, and PubMed (up to January 2024) focusing on the association between PFAS exposure and gastrointestinal cancers. Four independent reviewers screened the studies, extracted the information, and evaluated the quality of the studies using a modified Newcastle-Ottawa Scale. Meta-analyses were performed with random-effects models, including stratified analyses and dose-response assessments.

RESULTS

The meta-analysis included 17 studies. The summary relative risks (RR) of esophageal cancer for perfluorooctanoic acid (PFOA) exposure was 0.75 (95% confidence interval [CI], 0.35-1.60; n = 2), and for perfluorooctane sulfonic acid (PFOS) was 1.76 (95% CI, 0.32-9.68; n = 1). The RR for gastric cancer and PFOA was 0.59 (95% CI, 0.28-1.21; n = 2) and PFAS was 0.96 (95% CI, 0.83-1.12; n = 2). The RR for colorectal cancer and PFOA was 0.83 (95% CI, 0.65-1.06; n = 6) and PFOS was 0.71 (95% CI, 0.22-2.27; n = 4). The RR for pancreatic cancer was 1.02 (95% CI, 0.90-1.15; n = 9) and PFOS was 0.92 (95% CI, 0.76-1.11; n = 2). Stratified analyses by geographical region, study design, quality score, year of publication, gender, and outcome revealed no associations for colorectal and pancreatic cancers. No dose-response trends were identified. Publication bias was suggested for gastric cancer.

CONCLUSION

Our study suggested no association between PFAS exposure and esophageal, gastric, colorectal, or pancreatic cancer. More rigorous research is needed to investigate this relationship in different settings, with precise PFAS quantification, a wider range of compounds, larger sample sizes for specific cancers, and better control for potential confounders. Our meta-analysis suggests inconclusive evidence, highlighting the need for further research.

Environmental Exposure to Per- and Polyfluorylalkyl Substances (PFASs) and Reproductive Outcomes in the General Population: A Systematic Review of Epidemiological Studies

This Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) systematic review synthesized effects of background levels of per- and polyfluorylalkyl substance (PFAS) levels on reproductive health outcomes in the general public: fertility, preterm birth, miscarriage, ovarian health, menstruation, menopause, sperm health, and in utero fetal growth. The inclusion criteria included original research (or primary) studies, human subjects, and investigation of outcomes of interest following non-occupational exposures. It drew from four databases (Web of Science, PubMed, Embase and Health and Environmental Research Online (HERO)) using a standardized search string for all studies published between 1 January 2017 and 13 April 2022. Risk of bias was assessed by two independent reviewers. Data were extracted and reviewed by multiple reviewers. Each study was summarized under its outcome in terms of methodology and results and placed in context, with recommendations for future research. Of 1712 records identified, 30 were eligible, with a total of 27,901 participants (33 datasets, as three studies included multiple outcomes). There was no effect of background levels of PFAS on fertility. There were weakly to moderately increased odds of preterm birth with higher perfluorooctane sulfonic acid (PFOS) levels; the same for miscarriage with perfluorooctanoic acid (PFOA) levels. There was limited yet suggestive evidence for a link between PFAS and early menopause and primary ovarian insufficiency; menstrual cycle characteristics were inconsistent. PFAS moderately increased odds of PCOS- and endometriosis-related infertility, respectively. Sperm motility and DNA health were moderately impaired by multiple PFAS. Fetal growth findings were inconsistent. This review may be used to inform forthcoming drinking water standards and policy initiatives regarding PFAS compounds and drinking water. Future reviews would benefit from more recent studies. Larger studies in these areas are warranted. Future studies should plan large cohorts and open access data availability to capture small effects and serve the public. Funding: Great Lakes Water Authority (Detroit, MI), the Erb Family Foundation through Healthy Urban Waters at Wayne State University (Detroit, MI), and Wayne State University CLEAR Superfund Research (NIH P42ES030991).

Reproductive mechanisms, pathologies, and health inclusivity: insights from the 2023 Annual Meeting of the Society for Reproductive Biology

In 2023, the Society for Reproductive Biology met in Brisbane to deliver its largest scientific program to date. Herein, we detail key areas of notable discovery across the reproductive biology and fertility landscapes, as well as pressing areas that require further research. Specifically, we focus on five key themes: the cellular basis of reproduction; environmental impacts on reproduction; inclusivity in reproductive health; reproductive cancers; and evolution of reproduction mechanisms. Highlights included the utility of organism models, such as using fruit flies to model human genetic disease, and the development of new blastocyst models; the impact of elevated temperature and endocrine-disrupting chemicals on the germline, sex organ development, and fertility in mammals; how we can improve the inclusivity of transgender and Pacific Rainbow+ people in reproductive health; novel insights in reproductive cancer pathogenesis and inhibitor treatments; and the evolution of the sex chromosomes and sex determination across animals. The breadth of topics covered underscores the far-reaching impacts of reproduction and its related processes across life, health, and wellbeing, as well as for food production and the economy.

Enhancement of per- and Polyfluoroalkyl Substances (PFAS) quantification on surface waters from marinas in the douro river, Portugal

PFAS, known as "forever" compounds, are prevalent in various environments, including soils and aquatic systems, due to extensive usage. Surface waters in several European countries, especially marinas and ports with high boat traffic, require further study as potential contamination sources. Reliable methods for the extraction and quantification of these emergent compounds are essential. This study aimed to improve an existent solid phase extraction method to analyse marinas and ports' surface waters with variable salinities (2, 9 and 17 PSU). The objectives were to: 1) optimise the solid phase extraction method, considering matrix salinity effects and cross-contaminations, 2) validate the extraction and quantification method of 18 EPA 537.1 PFAS in estuarine surface waters, using the Ultra-High Performance Liquid Chromatography - Quadrupole Time - Of - Flight - Tandem Mass spectrometry, and 3) apply the optimised method for PFAS quantification in three Portuguese marinas. All ICH criteria were successfully validated considering 9 PSU. Limits of quantification ranged from 117.80 ng/L to 385 ng/L, except for PFHpA (645.85 ng/L). PFAS levels (PFOA, HFPO-DA, PFBS, PFHxS and PFOS) were relatively low, reaching a maximum of 0.32 ng/L only for the PFOA. In Freixo marina, total average concentrations were slightly higher (∑PFAS = 1.02 ng/L) when compared to the ones found in Cais da Ribeira Port (∑PFAS = 0.94 ng/L) and Afurada marina (∑PFAS = 0.81 ng/L). PFOS concentrations are below the limit values set by the Environmental Quality Standards (36000 ng/L of PFOS for inland surface water, respectively), similar to other Portuguese river studies. This study enabled the development of a precise and reliable extraction and quantification method to quantify PFAS in estuarine surface waters, particularly from marinas. This method can be readily applied to analyse PFAS in other estuarine samples.

Removal of perfluoroalkyl and polyfluoroalkyl substances from tap water by means of point-of-use treatment: A review

Perfluoroalkyl and polyfluoroalkyl substances (PFAS) are widely used synthetic chemicals known for their environmental persistence and adverse health effects. For this reason, they have come under increasing scrutiny in drinking water, with several groundbreaking drinking water regulations adopted recently in the US and the EU. Nevertheless, conventional treatment processes often fail to remove PFAS effectively, raising concerns about drinking water quality and consumer health. More advanced treatment processes can remove PFAS with varying success from drinking water treatment plants. Using similar technology to that used in centralized PFAS treatment, many types of point-of-use/point-of-entry (POU/POE) water treatment devices are also commercially available. Herein, an overview of the literature regarding POU/POE efficacy in the removal of PFAS from tap water was compiled and critically discussed. Generally, they employ treatment technologies like granular activated carbon, ion exchange, and reverse osmosis to remove PFAS contamination. Despite their laboratory testing and often certification for removal of perfluorooctanoic and perfluorooctanesulfonic acid and other PFAS in tap water, in most cases their efficacy in actual use has yet to be well characterized. In particular, inconsistent testing and insufficient real-life studies complicate assessments of their long-term performance, especially against short-chain PFAS. Furthermore, improperly maintained activated carbon systems might even raise PFAS levels in purified water. Only a few peer-reviewed studies have measured PFAS levels at the tap after POU/POE treatment, with just five assessing removal efficiency in real-life scenarios. Limited to the findings described, not all filters were demonstrated to be effective, especially against short-chain PFAS. Additionally, inconsistent testing methods that do not follow standard guidelines make it hard to compare filter results, and the long-term performance of these systems remains uncertain. More occurrence studies are essential to verify performance over time and understand exposure to these contaminants through water treated by household systems.

Exploring perfluoroalkyl substances contamination in human breast milk: First ghanaian study

Perfluoroalkyl and polyfluoroalkyl substances (PFAS) represent a category of synthetic organic chemical contaminants that have garnered increasing attention due to their potential adverse impacts. Existing research underscores the contamination of human breast milk by PFAS, raising concerns regarding potential deleterious health effects in children. The study aimed to explore the levels of some PFAS in human breast milk in a previously unstudied population to determine the extent of infants' exposure. The research was conducted at Ho Teaching Hospital in Ghana. The study protocol was reviewed and approval by University of Health and Allied Sciences Ethics Research Committee (UHAS-REC). Twenty-nine (29) mothers, aged 18-44 years, were enrolled in the research. Sample collection spanned from December 28, 2020 to June 30, 2021. Ten millilitres (10 mL) of breast milk were collected from each participant into cleaned bottles from day of birth to after two weeks postpartum, following a standardized protocol and stored at -20 °C. Sample preparation and analysis employed solid phase extraction methodology. Subsequently, the processed extracts were subjected to analysis using ultra-high-performance liquid chromatography (UPLC-MS/MS). The data obtained were analysed using IBM SPSS Statistics version 26, Excel 2016, and Xlstat 2022. Descriptive statistics were employed to summarize the study variables. The mean/mode input method was used to treat missing data. The median and interquartile range (IQR) of PFAS concentrations in the breast milk were: PFHxA, 6.0 ng/L(IQR, 2.2 ng/L), PFHpA, 5.6 ng/L(IQR, 2.1 ng/L), PFOA, 72.0 ng/L(IQR, 16.0 ng/L), and PFOS, 93.0 ng/L(IQR, 8.0 ng/L) ng/L) respectively. PFOS and PFOA were the most dominant PFAS in the breast milk which is consistent with worldwide reports. The levels of PFAS, particularly PFOS and PFOA, in breast milk points to seemingly high levels of PFAS exposure and contamination of mothers and neonates in the region.