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Bertato L, Chirico N, Papa E. QSAR Models for the Prediction of Dietary Biomagnification Factor in Fish. TOXICS 2023; 11:209. [PMID: 36976974 PMCID: PMC10054725 DOI: 10.3390/toxics11030209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 02/14/2023] [Accepted: 02/17/2023] [Indexed: 06/18/2023]
Abstract
Xenobiotics released in the environment can be taken up by aquatic and terrestrial organisms and can accumulate at higher concentrations through the trophic chain. Bioaccumulation is therefore one of the PBT properties that authorities require to assess for the evaluation of the risks that chemicals may pose to humans and the environment. The use of an integrated testing strategy (ITS) and the use of multiple sources of information are strongly encouraged by authorities in order to maximize the information available and reduce testing costs. Moreover, considering the increasing demand for development and the application of new approaches and alternatives to animal testing, the development of in silico cost-effective tools such as QSAR models becomes increasingly important. In this study, a large and curated literature database of fish laboratory-based values of dietary biomagnification factor (BMF) was used to create externally validated QSARs. The quality categories (high, medium, low) available in the database were used to extract reliable data to train and validate the models, and to further address the uncertainty in low-quality data. This procedure was useful for highlighting problematic compounds for which additional experimental effort would be required, such as siloxanes, highly brominated and chlorinated compounds. Two models were suggested as final outputs in this study, one based on good-quality data and the other developed on a larger dataset of consistent Log BMFL values, which included lower-quality data. The models had similar predictive ability; however, the second model had a larger applicability domain. These QSARs were based on simple MLR equations that could easily be applied for the predictions of dietary BMFL in fish, and support bioaccumulation assessment procedures at the regulatory level. To ease the application and dissemination of these QSARs, they were included with technical documentation (as QMRF Reports) in the QSAR-ME Profiler software for QSAR predictions available online.
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O'Callaghan I, Fitzpatrick D, Sullivan T. Thiophilicity is a determinant of bioaccumulation in benthic fauna. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 294:118641. [PMID: 34890745 DOI: 10.1016/j.envpol.2021.118641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 11/09/2021] [Accepted: 12/03/2021] [Indexed: 06/13/2023]
Abstract
Aquatic contamination can settle into sediments, where it complexes with organic matter and becomes bioavailable. The resulting bioaccumulation of these contaminants by benthic fauna poses a serious threat due to the potential for trophic transfer. This paper offers an insight into the heterogenous accumulation behavior of different elements, and the consequences for ecological risk. In this study, we present field quantification of sediment-associated bioaccumulation factors (BAFS) in freshwater benthic macroinvertebrates. 17 elements were quantified using ICP-MS in sediment and Asellus aquaticus and Gammarus sp. samples. Previously published reports of contaminant concentrations in freshwater and marine sediments and benthic fauna were likewise analyzed to provide a complementary picture of bioaccumulation across contaminants and taxa. We demonstrate that the BAFS correlates strongly with the thiophilicity of the elemental contaminants, as defined by (Kepp, 2016), for all strata examined. These findings support the hypothesis that thiol-mediated processes, such as that of metallothionein, play a larger role in bioaccumulation than typically afforded. In conclusion, we demonstrate the potential for the thiophilic scale to act as a predictor of accumulation potential.
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Affiliation(s)
- Irene O'Callaghan
- School of Biological, Earth & Environmental Sciences, University College Cork, Ireland; School of Chemistry, University College Cork, Ireland.
| | | | - Timothy Sullivan
- School of Biological, Earth & Environmental Sciences, University College Cork, Ireland; Environmental Research Institute, University College Cork, Ireland
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Fairbrother A, Muir D, Solomon KR, Ankley GT, Rudd MA, Boxall AB, Apell JN, Armbrust KL, Blalock BJ, Bowman SR, Campbell LM, Cobb GP, Connors KA, Dreier DA, Evans MS, Henry CJ, Hoke RA, Houde M, Klaine SJ, Klaper RD, Kullik SA, Lanno RP, Meyer C, Ottinger MA, Oziolor E, Petersen EJ, Poynton HC, Rice PJ, Rodriguez‐Fuentes G, Samel A, Shaw JR, Steevens JA, Verslycke TA, Vidal‐Dorsch DE, Weir SM, Wilson P, Brooks BW. Toward Sustainable Environmental Quality: Priority Research Questions for North America. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2019; 38:1606-1624. [PMID: 31361364 PMCID: PMC6852658 DOI: 10.1002/etc.4502] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 03/19/2019] [Accepted: 05/16/2019] [Indexed: 05/19/2023]
Abstract
Anticipating, identifying, and prioritizing strategic needs represent essential activities by research organizations. Decided benefits emerge when these pursuits engage globally important environment and health goals, including the United Nations Sustainable Development Goals. To this end, horizon scanning efforts can facilitate identification of specific research needs to address grand challenges. We report and discuss 40 priority research questions following engagement of scientists and engineers in North America. These timely questions identify the importance of stimulating innovation and developing new methods, tools, and concepts in environmental chemistry and toxicology to improve assessment and management of chemical contaminants and other diverse environmental stressors. Grand challenges to achieving sustainable management of the environment are becoming increasingly complex and structured by global megatrends, which collectively challenge existing sustainable environmental quality efforts. Transdisciplinary, systems-based approaches will be required to define and avoid adverse biological effects across temporal and spatial gradients. Similarly, coordinated research activities among organizations within and among countries are necessary to address the priority research needs reported here. Acquiring answers to these 40 research questions will not be trivial, but doing so promises to advance sustainable environmental quality in the 21st century. Environ Toxicol Chem 2019;38:1606-1624. © 2019 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals, Inc. on behalf of SETAC.
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Affiliation(s)
| | - Derek Muir
- Aquatic Contaminants Research DivisionEnvironment and Climate Change Canada, Burlington ONCanada
| | - Keith R. Solomon
- School of Environmental SciencesUniversity of Guelph, GuelphOntarioCanada
| | | | | | | | - Jennifer N. Apell
- Department of Civil & Environmental EngineeringMassachusetts Institute of Technology, CambridgeMAUSA
| | - Kevin L. Armbrust
- Department of Environmental Sciences, College of the Coast and EnvironmentLouisiana State University, Baton RougeLouisianaUSA
| | - Bonnie J. Blalock
- School for the EnvironmentUniversity of Massachusetts BostonBostonMassachusettsUSA
| | - Sarah R. Bowman
- Michigan Department of Environmental QualityDetroitMichiganUSA
| | - Linda M. Campbell
- Environmental Science, Saint Mary's University, HalifaxNova ScotiaCanada
| | - George P. Cobb
- Department of Environmental ScienceBaylor UniversityWacoTexasUSA
| | | | - David A. Dreier
- Center for Environmental & Human ToxicologyUniversity of FloridaGainesvilleFloridaUSA
| | - Marlene S. Evans
- Aquatic Contaminants Research DivisionEnvironment and Climate Change Canada, Burlington ONCanada
| | | | | | - Magali Houde
- Aquatic Contaminants Research DivisionEnvironment and Climate Change Canada, Burlington ONCanada
| | | | | | | | | | | | - Mary Ann Ottinger
- Department of Biology and BiochemistryUniversity of HoustonHoustonTexasUSA
| | - Elias Oziolor
- Department of Environmental ScienceBaylor UniversityWacoTexasUSA
| | - Elijah J. Petersen
- Material Measurement LaboratoryNational Institute of Standards and TechnologyGaithersburgMarylandUSA
| | - Helen C. Poynton
- School for the EnvironmentUniversity of Massachusetts BostonBostonMassachusettsUSA
| | - Pamela J. Rice
- US Department of AgricultureAgricultural Research ServiceWashington, DC
| | | | | | - Joseph R. Shaw
- School of Public and Environmental Affairs, Indiana UniversityBloomingtonIndianaUSA
| | | | | | | | - Scott M. Weir
- Queen's University of CharlotteCharlotteNorth CarolinaUSA
| | | | - Bryan W. Brooks
- Procter and GambleCincinnatiOhioUSA
- Institute of Biomedical Studies, Baylor UniversityWacoTexasUSA
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4
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Kurt-Karakus PB, Muir DCG, de Jourdan B, Teixeira C, Epp Martindale J, Embers H, Wang X, Keir M, Backus S. Bioaccumulation of Selected Halogenated Organic Flame Retardants in Lake Ontario. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2019; 38:1198-1210. [PMID: 30901092 DOI: 10.1002/etc.4413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 02/25/2019] [Accepted: 03/07/2019] [Indexed: 06/09/2023]
Abstract
The trophic magnification of polybrominated diphenyl ethers (PBDEs) and selected nonlegacy halogenated organic compounds (HOCs) was determined in the food web of Lake Ontario (ON, Canada). In all, 28 Br3 -Br8 -PBDEs and 24 HOCs (10 of which had not been targeted previously) were analyzed. Average concentrations of Σ28 PBDEs in fish ranged between 79.7 ± 54.2 ng/g lipid weight in alewife (Alosa pseudoharengus) and 815 ± 695 ng/g lipid weight in lake trout (Salvelinus namaycush). For invertebrates, concentrations were between 13.4 ng/g lipid weight (net plankton; >110 μm) and 41.9 ng/g lipid weight in Diaporeia (Diaporeia hoyi). Detection frequency (DF) for HOCs was highest for anti-Dechlorane Plus (anti-DDC-CO), 1,3-diiodobenzene (1,3-DiiB), tribromo-methoxy-methylbenzene (ME-TBP), allyl 2,4,6-tribromophenyl ether (TBP-AE), pentabromocyclododecene (PBCYD), α+β-tetrabromocylcooctane (TBCO), 2-bromoallyl 2,4,6-tribromophenyl ether (BATE), and pentabromotoluene (PBT; DF for all = 100% in lake trout). Tetrabromoxylene (TBX), dibromopropyl 2,4,6-tribromophenyl ether (TBP-DBPE), and syn-DDC-CO were also frequently detected in trout (DF = 70-78%), whereas 2,3,4,5,6-pentabromoethyl benzene (PBEB) was detected only in plankton. Several HOCs were reported in aquatic biota in the Great Lakes (USA/Canada) for the first time in the present study, including PBCYD, 1,3DiiB, BATE, TBP-DBPE, PBT, α + β-TBCO, and ME-TBP. The Br4-6 -BDEs (-47, -85, -99, -100, -153, and -154) all had prey-weighted biomagnification factors (BMFPW ) values >6, whereas BMFPW values for Br7-8 -BDEs were <1. The highest BMFPW values of non-PBDEs were for TBP-DBPE (10.6 ± 1.34) and ME-TBP (4.88 ± 0.60), whereas TBP-AE had a BMFPW value of <1. Significant (p ≤ 0.05) trophic magnification factors (TMFs), both positive and negative, were found for Br4-8- BDEs (BDE 196 = 0.4; BDE 154 = 9.5) and for bis(2,4,6-tribromophenoxy)ethane (BTBPE; 0.53), PBCYD (1.8), 1,3-DiiB (0.33), and pentabromobenzene (PBB; 0.25). Food chain length was found to have a significant influence on the TMF values. Environ Toxicol Chem 2019;38:1198-1210. © 2019 SETAC.
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Affiliation(s)
- Perihan B Kurt-Karakus
- Department of Environmental Engineering, Faculty of Engineering and Natural Sciences, Bursa Technical University, Bursa, Turkey
| | - Derek C G Muir
- Aquatic Contaminants Research Division, Environment & Climate Change Canada, Burlington, Ontario, Canada
| | - Benjamin de Jourdan
- Aquatic Contaminants Research Division, Environment & Climate Change Canada, Burlington, Ontario, Canada
- Huntsman Ocean Sciences, St. Andrews, New Brunswick, Canada
| | - Camilla Teixeira
- Aquatic Contaminants Research Division, Environment & Climate Change Canada, Burlington, Ontario, Canada
| | | | - Heather Embers
- Aquatic Contaminants Research Division, Environment & Climate Change Canada, Burlington, Ontario, Canada
| | - Xiaowa Wang
- Aquatic Contaminants Research Division, Environment & Climate Change Canada, Burlington, Ontario, Canada
| | - Mike Keir
- Water Quality Monitoring and Surveillance, Environment & Climate Change Canada, Burlington, Ontario, Canada
| | - Sean Backus
- Water Quality Monitoring and Surveillance, Environment & Climate Change Canada, Burlington, Ontario, Canada
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5
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Munz NA, Fu Q, Stamm C, Hollender J. Internal Concentrations in Gammarids Reveal Increased Risk of Organic Micropollutants in Wastewater-Impacted Streams. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:10347-10358. [PMID: 30117321 DOI: 10.1021/acs.est.8b03632] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Internal concentrations link external exposure to the potential effect, as they reflect what the organisms actually take up and experience physiologically. In this study, we investigated whether frequently detected risk-driving substances in water were found in the exposed organisms and if they are classified the same based on the whole body internal concentrations. Field gammarids were collected upstream and downstream of ten wastewater treatment plants in mixed land use catchments. The sampling was conducted in autumn and winter, during low flow conditions when diffuse agricultural input was reduced. The field study was complemented with laboratory and flume experiments to determine the bioaccumulation potentials of selected substances. For 32 substances, apparent bioaccumulation factors in gammarids were determined for the first time. With a sensitive multiresidue method based on online-solid phase extraction followed by liquid chromatography coupled to high resolution mass spectrometry, we detected 63 (semi-) polar organic substances in the field gammarids, showing higher concentrations downstream than upstream. Interestingly, neonicotinoids, which are particularly toxic toward invertebrates, were frequently detected and were further determined as major contributors to the toxic pressure based on the toxic unit approach integrating internal concentration and toxic potency. The total toxic pressure based on internal concentrations was substantially higher compared to when external concentrations were used. Thus, internal concentrations may add more value to the current environmental risk assessment that is typically based solely on external exposure.
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Affiliation(s)
- Nicole A Munz
- Eawag , Swiss Federal Institute of Aquatic Science and Technology , 8600 Dübendorf , Switzerland
- Institute of Biogeochemistry and Pollutant Dynamics , ETH Zürich , 8092 Zürich , Switzerland
| | - Qiuguo Fu
- Eawag , Swiss Federal Institute of Aquatic Science and Technology , 8600 Dübendorf , Switzerland
| | - Christian Stamm
- Eawag , Swiss Federal Institute of Aquatic Science and Technology , 8600 Dübendorf , Switzerland
| | - Juliane Hollender
- Eawag , Swiss Federal Institute of Aquatic Science and Technology , 8600 Dübendorf , Switzerland
- Institute of Biogeochemistry and Pollutant Dynamics , ETH Zürich , 8092 Zürich , Switzerland
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Mackay D, Celsie AKD, Powell DE, Parnis JM. Bioconcentration, bioaccumulation, biomagnification and trophic magnification: a modelling perspective. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2018; 20:72-85. [PMID: 29260171 DOI: 10.1039/c7em00485k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We present a modelling perspective on quantifying metrics of bio-uptake of organic chemicals in fish. The models can be in concentration, partition ratio, rate constant (CKk) format or fugacity, Z and D value (fZD) format that are shown to be exactly equivalent, each having it merits. For most purposes a simple, parameter-parsimonious one compartment steady-state model containing some 13 parameters is adequate for obtaining an appreciation of the uptake equilibria and kinetics for scientific and regulatory purposes. Such a model is first applied to the bioaccumulation of a series of hypothetical, non-biotransforming chemicals with log KOW (octanol-water partition ratio) values of 4 to 8 in 10 g fish ranging in lipid contents to deduce wet-weight and lipid normalized concentrations, bioaccumulation and biomagnification factors. The sensitivity of biomagnification factors to relative lipid contents is discussed. Second, a hypothetical 5 species linear food chain is simulated to evaluate trophic magnification factors (TMFs) showing the critical roles of KOW and biotransformation rate. It is shown that lipid normalization of concentrations is most insightful for less hydrophobic chemicals (log KOW < 5) when bio-uptake is largely controlled by respiratory intake and equilibrium (equi-fugacity) is approached. For more hydrophobic chemicals when dietary uptake kinetics dominate, wet weight concentrations and BMFs are more insightful. Finally, a preferred strategy is proposed to advance the science of bioaccumulation using a combination of well-designed ecosystem monitoring, laboratory determinations and modelling to confirm that the perceived state of the science contained in the models is consistent with observations.
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Affiliation(s)
- Donald Mackay
- Chemical Properties Research Group, Department of Chemistry, Trent University, Peterborough, ON K9L OG2, Canada.
| | - Alena K D Celsie
- Chemical Properties Research Group, Department of Chemistry, Trent University, Peterborough, ON K9L OG2, Canada. and Chemistry Department, Queens University, Kingston, ON K7L 3N6, Canada
| | | | - J Mark Parnis
- Chemical Properties Research Group, Department of Chemistry, Trent University, Peterborough, ON K9L OG2, Canada. and Chemistry Department, Queens University, Kingston, ON K7L 3N6, Canada
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7
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Hoke R, Huggett D, Brasfield S, Brown B, Embry M, Fairbrother A, Kivi M, Paumen ML, Prosser R, Salvito D, Scroggins R. Review of laboratory-based terrestrial bioaccumulation assessment approaches for organic chemicals: Current status and future possibilities. INTEGRATED ENVIRONMENTAL ASSESSMENT AND MANAGEMENT 2016; 12:109-122. [PMID: 26272585 DOI: 10.1002/ieam.1692] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Revised: 04/09/2015] [Accepted: 07/13/2015] [Indexed: 06/04/2023]
Abstract
In the last decade, interest has been renewed in approaches for the assessment of the bioaccumulation potential of chemicals, principally driven by the need to evaluate large numbers of chemicals as part of new chemical legislation, while reducing vertebrate test organism use called for in animal welfare legislation. This renewed interest has inspired research activities and advances in bioaccumulation science for neutral organic chemicals in aquatic environments. In January 2013, ILSI Health and Environmental Sciences Institute convened experts to identify the state of the science and existing shortcomings in terrestrial bioaccumulation assessment of neutral organic chemicals. Potential modifications to existing laboratory methods were identified, including areas in which new laboratory approaches or test methods could be developed to address terrestrial bioaccumulation. The utility of "non-ecotoxicity" data (e.g., mammalian laboratory data) was also discussed. The highlights of the workshop discussions are presented along with potential modifications in laboratory approaches and new test guidelines that could be used for assessing the bioaccumulation of chemicals in terrestrial organisms.
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Affiliation(s)
- Robert Hoke
- DuPont, Haskell Global Centers for Health and Environmental Sciences, Newark, Delaware, USA
| | | | - Sandra Brasfield
- US Army Engineer Research and Development Center, Vicksburg, Mississippi
| | - Becky Brown
- AstraZeneca, Global Environment, Cheshire, United Kingdom; Present address: WCA, Brunel House, Volunteer Way, Faringdon, Oxfordshire, United Kingdom
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8
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Gobas FAPC, Burkhard LP, Doucette WJ, Sappington KG, Verbruggen EMJ, Hope BK, Bonnell MA, Arnot JA, Tarazona JV. Review of existing terrestrial bioaccumulation models and terrestrial bioaccumulation modeling needs for organic chemicals. INTEGRATED ENVIRONMENTAL ASSESSMENT AND MANAGEMENT 2016; 12:123-134. [PMID: 26272325 DOI: 10.1002/ieam.1690] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Revised: 04/09/2015] [Accepted: 07/13/2015] [Indexed: 06/04/2023]
Abstract
Protocols for terrestrial bioaccumulation assessments are far less-developed than for aquatic systems. This article reviews modeling approaches that can be used to assess the terrestrial bioaccumulation potential of commercial organic chemicals. Models exist for plant, invertebrate, mammal, and avian species and for entire terrestrial food webs, including some that consider spatial factors. Limitations and gaps in terrestrial bioaccumulation modeling include the lack of QSARs for biotransformation and dietary assimilation efficiencies for terrestrial species; the lack of models and QSARs for important terrestrial species such as insects, amphibians and reptiles; the lack of standardized testing protocols for plants with limited development of plant models; and the limited chemical domain of existing bioaccumulation models and QSARs (e.g., primarily applicable to nonionic organic chemicals). There is an urgent need for high-quality field data sets for validating models and assessing their performance. There is a need to improve coordination among laboratory, field, and modeling efforts on bioaccumulative substances in order to improve the state of the science for challenging substances.
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Affiliation(s)
| | | | | | | | - Eric M J Verbruggen
- National Institute for Public Health and the Environment, Bilthoven, the Netherlands
| | | | | | - Jon A Arnot
- Arnot Research and Consulting, Toronto, Ontario, Canada
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Arnot JA, Quinn CL. Development and evaluation of a database of dietary bioaccumulation test data for organic chemicals in fish. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:4783-4796. [PMID: 25821900 DOI: 10.1021/es506251q] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Dietary bioaccumulation tests for fish have been conducted for about 40 years. Standardized test guidance has recently been developed. Test metrics of primary scientific and regulatory interest are the whole body depuration rate constant (kT), whole body growth corrected depuration rate constant (kTg), and corresponding chemical half-lives (t1/2 and t1/2g), dietary chemical absorption efficiency (AE), and biomagnification factor (BMF). A database of 3032 measurement end points for 477 discrete organic chemicals including 964 half-lives, 1199 AEs and 869 BMFs from 19 species (primarily trout and carp) was developed from the literature. Biological properties (e.g., organism weight, lipid content) and exposure conditions (e.g., temperature, feeding rate, dietary lipid content, exposure duration) are documented. Test chemicals range in molar mass from 120 to 1423 g·mol(-1) with log octanol-water partition coefficients (KOW) ranging from 0.8 to 14.3; 50% of the database entries are for polychlorinated biphenyls. The measured end points are derived from various protocols and sources of variability are described. The data are evaluated and categorized using proposed data quality (confidence) criteria derived from the standardized test protocol providing initial guidance for data users. Half-lives range from 0.13 to 2600 days; however, approximately 54% have an identifiable source of uncertainty. The data suggest that chemicals absorbed from the gastrointestinal tract with a log KOW ≥ ∼5 and at least as high as ∼9 have biomagnification potential in fish. A mechanistic bioaccumulation model is compared to the measured data and used to illustrate the influence of growth and biotransformation rates on the BMF.
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Affiliation(s)
- Jon A Arnot
- †ARC Arnot Research and Consulting Inc., 36 Sproat Avenue, Toronto, Ontario, Canada, M4M 1W4
- ‡Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, Ontario, Canada, M1C 1A4
| | - Cristina L Quinn
- †ARC Arnot Research and Consulting Inc., 36 Sproat Avenue, Toronto, Ontario, Canada, M4M 1W4
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10
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López-Serrano A, Muñoz-Olivas R, Sanz-Landaluze J, Olasagasti M, Rainieri S, Cámara C. Comparison of bioconcentration of ionic silver and silver nanoparticles in zebrafish eleutheroembryos. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2014; 191:207-214. [PMID: 24858804 DOI: 10.1016/j.envpol.2014.04.020] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Revised: 04/09/2014] [Accepted: 04/11/2014] [Indexed: 06/03/2023]
Abstract
The production of silver nanoparticles has reached nowadays high levels. Bioconcentration studies, information on persistence and toxicity are fundamental to assess their global risk and thus necessary to establish legislations regarding their use. Previous studies on silver nanoparticle toxicity have determined a clear correlation between their chemical stability and toxicity. In this work, experimental conditions able to assure silver nanoparticles stability have been optimized. Then, zebrafish (Danio rerio) eleutheroembryos were exposed to ionic silver and to Ag NPs for comparison purposes. A protocol alternative to the OECD 305 technical guideline was used. To determine silver concentration in both the eleutheroembryos and the exposure media, an analytical method consisting in ultrasound assisted extraction, followed by inductively coupled plasma mass spectrometry and graphite furnace atomic absorption spectrometry, was developed. Then, bioconcentration factors were calculated. The results revealed that ionic silver was more accumulative for zebrafish eleutheroembryos than nanoparticles at the levels tested.
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Affiliation(s)
- A López-Serrano
- Department of Analytical Chemistry, Faculty of Chemistry, University Complutense of Madrid, Ciudad Universitaria, 28040 Madrid, Spain
| | - R Muñoz-Olivas
- Department of Analytical Chemistry, Faculty of Chemistry, University Complutense of Madrid, Ciudad Universitaria, 28040 Madrid, Spain.
| | - J Sanz-Landaluze
- Department of Analytical Chemistry, Faculty of Chemistry, University Complutense of Madrid, Ciudad Universitaria, 28040 Madrid, Spain
| | - M Olasagasti
- AZTI-Tecnalia, Food Research Division, Parque Tecnológico de Bizkaia, Astondo Bidea 609, 48160 Derio, Spain
| | - S Rainieri
- AZTI-Tecnalia, Food Research Division, Parque Tecnológico de Bizkaia, Astondo Bidea 609, 48160 Derio, Spain
| | - C Cámara
- Department of Analytical Chemistry, Faculty of Chemistry, University Complutense of Madrid, Ciudad Universitaria, 28040 Madrid, Spain.
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11
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Judd N, Tear L, Toll J. From sediment to tissue and tissue to sediment: an evaluation of statistical bioaccumulation models. INTEGRATED ENVIRONMENTAL ASSESSMENT AND MANAGEMENT 2014; 10:102-113. [PMID: 24105951 DOI: 10.1002/ieam.1484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Revised: 05/25/2013] [Accepted: 08/27/2013] [Indexed: 06/02/2023]
Abstract
Biota-sediment accumulation factors (BSAFs) and biota-sediment accumulation regressions (BSARs) are statistical models that may be used to estimate tissue chemical concentrations from sediment chemical concentrations or vice versa. Biota-sediment accumulation factors and BSARs are used to fill tissue concentration data gaps, set sediment preliminary remediation goals (PRGs), and make projections about the effectiveness of potential sediment cleanup projects in reducing tissue chemical concentrations. We explored field-based, benthic invertebrate biota-sediment chemical concentration relationships using data from the US Environmental Protection Agency (USEPA) Mid-Continent Ecology Division (MED) BSAF database. Approximately two thirds of the 262 relationships investigated were very poor (r(2) < 0.3 or p-value ≥ 0.05); for some of the biota-sediment relationships that did have a significant nonzero slope (p-value < 0.05), lipid-normalized tissue concentrations tended to decrease as the colocated organic carbon (OC)-normalized sediment concentration increased. Biota-sediment relationships were further evaluated for 3 of the 262 datasets. Biota-sediment accumulation factors, linear regressions, model II regressions, illustrative sediment PRGs, and confidence intervals (CIs) were calculated for each of the three examples. These examples illustrate some basic but important statistical practices that should be followed before selecting a BSAR or BSAF or relying on these simple models of biota-sediment relationships to support consequential management decisions. These practices include the following: one should not assume that the relationship between chemical concentrations in tissue and sediment is necessarily linear, one should not assume the model intercept to be zero, and one should not place too much stock on models that are heavily influenced by one or a few high chemical concentration data points. People will continue to use statistical models of field-based biota-sediment chemical concentration relationships to support sediment investigations and remedial action decisions. However, it should not be assumed that the models will be reliable. In developing and applying BSAFs and BSARs, it is essential that best practices are followed and model limitations and uncertainties are understood, acknowledged, and quantified as much as possible.
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Affiliation(s)
- Nancy Judd
- Windward Environmental LLC, Seattle, Washington, USA
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12
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McCarty LS. Are we in the dark ages of environmental toxicology? Regul Toxicol Pharmacol 2013; 67:321-4. [PMID: 24055990 DOI: 10.1016/j.yrtph.2013.09.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2013] [Revised: 09/07/2013] [Accepted: 09/10/2013] [Indexed: 11/28/2022]
Abstract
Environmental toxicity is judged to be in a "dark ages" period due to longstanding limitations in the implementation of the simple conceptual model that is the basis of current aquatic toxicity testing protocols. Fortunately, the environmental regulatory revolution of the last half-century is not substantially compromised as development of past regulatory guidance was designed to deal with limited amounts of relatively poor quality toxicity data. However, as regulatory objectives have substantially increased in breadth and depth, aquatic toxicity data derived with old testing methods are no longer adequate. In the near-term explicit model description and routine assumption validation should be mandatory. Updated testing methods could provide some improvements in toxicological data quality. A thorough reevaluation of toxicity testing objectives and methods resulting in substantially revised standard testing methods, plus a comprehensive scheme for classification of modes/mechanisms of toxic action, should be the long-term objective.
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Affiliation(s)
- L S McCarty
- Scientific Research & Consulting, 1115 Quaker Trail, Newmarket, ON L3X 3E2, Canada.
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