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Barreto MSC, Elzinga EJ, Kubicki JD, Sparks DL. A multi-scale assessment of the impact of salinity on the desorption of chromate from hematite: Sea level rise implications. JOURNAL OF HAZARDOUS MATERIALS 2024; 465:133041. [PMID: 38043423 DOI: 10.1016/j.jhazmat.2023.133041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 11/08/2023] [Accepted: 11/17/2023] [Indexed: 12/05/2023]
Abstract
The solubility and transport of Cr(VI) is primarily controlled by adsorption-desorption reactions at the surfaces of soil minerals such as iron oxides. Environmental properties such as pH, ionic strength, and ion competition are expected to affect the mobility and fate of Cr(VI). Sea level rise (SLR), and consequent seawater intrusion, is creating a new biogeochemical soil environment at coastal margins, potentially impacting Cr(VI) retention at contaminated sites. We employed in-situ ATR-FTIR spectroscopy and DFT calculations to investigate at the molecular level the adsorption of Cr(VI) on the hematite surface and its desorption by sulfate, as a function of pH and ionic strength. We further used a batch experiment to assess Cr(VI) desorption at varying artificial seawater (ASW) concentrations. IR results demonstrate the complexity of Cr(VI) adsorption, showing a combination of monodentate inner-sphere complexation at high pH and dichromate outer-sphere (∼75%) at low pH. The Cr(VI)-complexes exhibited desorption induced by increasing pH values (58% of desorption) and sulfate competition (∼40% desorption). ASW desorbed ∼20% more Cr(VI), even at just 1% concentration. Our findings provide insight into Cr(VI)-adsorption complexation that controls the retention and remobilization of Cr(VI) on Fe-oxide minerals. The results point to an elevated risk of Cr(VI) mobilization in contaminated soils affected by SLR.
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Affiliation(s)
| | - Evert J Elzinga
- Department of Earth & Environmental Sciences, Rutgers University, Newark, NJ, USA
| | - James D Kubicki
- Department of Earth, Environmental & Resource Sciences, The University of Texas at El Paso, El Paso, TX, USA
| | - Donald L Sparks
- Department of Plant & Soil Sciences, University of Delaware, Newark, DE, USA
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Turner A, Filella M. Lead and chromium in European road paints. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 316:120492. [PMID: 36279993 DOI: 10.1016/j.envpol.2022.120492] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 09/15/2022] [Accepted: 10/18/2022] [Indexed: 06/16/2023]
Abstract
Lead chromate was commonly employed as a pigment in coloured road markings until restrictions led to the development of safer alternatives. In this study, the presence and concentrations of Pb and Cr have been determined in 236 road paints of various colours sampled from streets, highways, footways and carparks from eleven European countries. According to energy-dispersive X-ray fluorescence spectrometry, Pb was detected (>10 mg kg-1) in 148 samples at concentrations up to 17.2% by weight, and above 1000 mg kg-1 yellow was the dominant paint colour. Lead concentrations on an area basis varied from 0.02 to 8.46 mg cm-2 and the metal was located at different depths amongst the samples, suggesting that formulations had been painted both recently and historically (and overpainted). Chromium was detected (>5 to 50 mg kg-1) in 81 samples at concentrations between 20 and 20,000 mg kg-1 and most often in yellow paints, and concentrations co-varied with those of Pb. These observations, and results of scanning electron microscopy coupled with energy-dispersive X-ray spectrometry, suggested that heterogeneously dispersed PbCrO4 was the dominant, but not the only, Pb-based pigment in the samples. Although there were significant international differences in frequency of Pb detection and median Pb concentrations, overall, and despite various, albeit complex, regulations, recent or extant road paint pigmented with Pb and Cr remains a pervasive environmental problem and a potential health risk in many European countries.
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Affiliation(s)
- Andrew Turner
- School of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK.
| | - Montserrat Filella
- Department F.-A. Forel, University of Geneva, Boulevard Carl-Vogt 66, CH-1205, Geneva, Switzerland.
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Xia B, Yuan J, Pang L, He K. Chromium [Cr(VI)] Exposure Causes Cytotoxicity of Human Bronchial Epithelial Cells (16-HBE) and Proteomic Alterations. Int J Toxicol 2022; 41:225-233. [PMID: 35341331 DOI: 10.1177/10915818221078277] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Hexavalent chromium [Cr(VI)] is a common industrial pollutant, and exposure may cause toxic effects in multiple organ systems and carcinogenesis, including lung cancer. However, the toxic effect of Cr(VI) on the respiratory system is poorly understood. In the present study, it was demonstrated that Cr(VI) exposure significantly decreased the viability of human bronchial epithelial cells (16-HBE) in a dose-dependent manner. Flow cytometry demonstrated that Cr(VI) enhanced the transition of 16-HBE cells from G1 to S phase and arrested S-phase progression. Reverse transcription-quantitative polymerase chain reaction analysis revealed a significant alteration in the expression of apoptosis-associated genes in Cr(VI)-treated 16-HBE cells. In addition, using two-dimensional fluorescence differential gel electrophoresis with mass spectrometry, 15 differentially expressed proteins (1 upregulated and 14 downregulated) were identified in 16-HBE cells with Cr(VI) treatment compared with controls. Functional classification revealed that these differentially expressed proteins were involved in apoptosis, cytoskeletal structure, and energy metabolism. In conclusion, these data suggested that Cr(VI) caused toxic effects in bronchial epithelial cells and the mechanisms may involve the abnormal expression of apoptosis-associated proteins, cytoskeletal proteins, and energy metabolism-associated proteins.
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Affiliation(s)
- Bo Xia
- College of Food Science and Technology, 12575Hunan Agricultural University, East Renmin Road, Changsha, China.,Key Laboratory of Modern Toxicology of Shenzhen, 568734Shenzhen Center for Disease Control and Prevention, Shenzhen, China
| | - Jiao Yuan
- College of Food Science and Technology, 12575Hunan Agricultural University, East Renmin Road, Changsha, China
| | - Li Pang
- College of Horticulture, 12575Hunan Agricultural University, East Renmin Road, Changsha, China
| | - Kaiwu He
- Key Laboratory of Modern Toxicology of Shenzhen, 568734Shenzhen Center for Disease Control and Prevention, Shenzhen, China
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Chen YC, Tseng CH, Chen YT. Modeling transmission of hexavalent chromium concentration and its health cost with a water quality analysis simulation program. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2021; 93:1779-1788. [PMID: 33829623 DOI: 10.1002/wer.1569] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 03/22/2021] [Accepted: 03/30/2021] [Indexed: 06/12/2023]
Abstract
In this study, the Water Quality Analysis Simulation Program (WASP7) was used to evaluate the transmission of hexavalent chromium (Cr(VI)) contamination in a water-sediment system and its flux into cultivated soils. The agricultural areas adjacent to the Wu River in Taiwan were taken as the study area, as these soils were heavily polluted with Cr(VI) concentrations of 2173-3271 μg/kg. The rates of accumulation of Cr(VI) are affected by the distance from the source of contamination and the size and type of cultivated areas. The highest concentrations of Cr(VI) (4.27 mg/kg) were detected in soil from Changhua city and correlated with the greater risk of gastric cancer in residents. Specifically, the risk of gastric cancer due to Cr(VI) contamination of agricultural soil was 3 × 10 - 7 - 15.2 × 10 - 6 in Taichung city (upstream) and 1.3 × 10 - 6 - 76.3 × 10 - 6 in Changhua county (downstream). The values of statistical life-years (VSLYs) were US$6.2-10 million for rice, US$42-60 million for corn, and US$360-580 million for other vegetables, respectively, each year. It is critical that techniques other than source reduction are used to reduce human exposure to Cr(VI), such as chemical oxidation or ion-exchange treatment to remove Cr(VI) from factory wastewaters, prior to their discharge into rivers. PRACTITIONER POINTS: This study evaluated the transmission of hexavalent chromium (Cr(VI)) contamination in a water-sediment-soil system. Maximum concentrations of Cr(VI) most rapidly accumulated in the smallest cultivated areas. The highest concentrations of Cr(VI) (3.3 mg/kg) were correlated with the greater risk of gastric cancer. Young children had a threefold greater risk of gastric cancer than adults. Techniques other than source reduction are prior to their discharge into rivers.
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Affiliation(s)
- Ying-Chu Chen
- Department of Civil Engineering, National Taipei University of Technology, Taipei City, Taiwan
| | - Chao-Heng Tseng
- Institute of Environmental Engineering and Management, National Taipei University of Technology, Taipei City, Taiwan
| | - Yun-Ting Chen
- Institute of Environmental Engineering and Management, National Taipei University of Technology, Taipei City, Taiwan
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Proctor DM, Bhat V, Suh M, Reichert H, Jiang X, Thompson CM. Inhalation cancer risk assessment for environmental exposure to hexavalent chromium: Comparison of margin-of-exposure and linear extrapolation approaches. Regul Toxicol Pharmacol 2021; 124:104969. [PMID: 34089813 DOI: 10.1016/j.yrtph.2021.104969] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 05/24/2021] [Accepted: 05/26/2021] [Indexed: 10/21/2022]
Abstract
Hexavalent chromium [Cr(VI)] exists in the ambient air at low concentrations (average upperbound ~0.1 ng/m3) yet airborne concentrations typically exceed EPA's Regional Screening Level for residential exposure (0.012 ng/m3) and other similar benchmarks, which assume a mutagenic mode of action (MOA) and use low-dose linear risk assessment models. We reviewed Cr(VI) inhalation unit risk estimates developed by researchers and regulatory agencies for environmental and occupational exposures and the underlying epidemiologic data, updated a previously published MOA analysis, and conducted dose-response modeling of rodent carcinogenicity data to evaluate the need for alternative exposure-response data and risk assessment approaches. Current research supports the role of non-mutagenic key events in the MOA, with growing evidence for epigenetic modifiers. Animal data show a weak carcinogenic response, even at cytotoxic exposures, and highlight the uncertainties associated with the current epidemiological data used in risk assessment. Points of departure from occupational and animal studies were used to determine margins of exposure (MOEs). MOEs range from 1.5 E+3 to 3.3 E+6 with a median of 5 E+5, indicating that current environmental exposures to Cr(VI) in ambient air should be considered of low concern. In this comprehensive review, the divergent results from default linear and MOE assessments support the need for more relevant and robust epidemiologic data, additional mechanistic studies, and refined risk assessment strategies.
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Affiliation(s)
- Deborah M Proctor
- ToxStrategies, Inc, 27001 La Paz Rd, Suite 260, Mission Viejo, CA, 92691, USA.
| | | | - Mina Suh
- ToxStrategies, Inc, 27001 La Paz Rd, Suite 260, Mission Viejo, CA, 92691, USA
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Hsu CY, Chi KH, Wu CD, Lin SL, Hsu WC, Tseng CC, Chen MJ, Chen YC. Integrated analysis of source-specific risks for PM 2.5-bound metals in urban, suburban, rural, and industrial areas. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 275:116652. [PMID: 33588193 DOI: 10.1016/j.envpol.2021.116652] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 01/29/2021] [Accepted: 01/30/2021] [Indexed: 06/12/2023]
Abstract
The levels and characteristics of atmospheric metals vary in time and location, can result in various health impacts, which increases the challenge of air quality management. We aimed to investigate PM2.5-bound metals in multiple locations and propose a methodology for comparing metal elements across study regions and prioritizing source contributions through integrated health risk assessments. PM2.5-bound metals were collected in the urban, suburban, rural, and industrial regions of Taiwan between 2016 and 2018. We incorporated the positive matrix factorization (PMF) with health risk assessments (considering estimates of the margin of exposure (MOE) and excess cancer risk (ECR)) to prioritize sources for control. We found that the concentrations of Fe, Zn, V, Cu, and Mn (industry-related metals) were higher at the industrial site (Kaohsiung) and Ba, Cr, Ni, Mo, and Co (traffic-related metals) were higher at the urban site (Taipei). The rural site (Hualian) had good air quality, with low PM2.5 and metal concentrations. Most metal concentrations were higher during the cold season for all study sites, except for the rural. Ambient concentrations of Mn, Cr, and Pb obtained from all study sites presents a higher health risk of concern. In Kaohsiung, south Taiwan, PM2.5-bound metals from the iron ore and steel factory is suggested as the first target for control based on the calculated health risks (MOE < 1 and ECR > 10-6). Overall, we proposed an integrated strategy for initiating the source management prioritization of PM2.5-bound metals, which can aid an effort for policymaking.
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Affiliation(s)
- Chin-Yu Hsu
- Department of Safety, Health and Environmental Engineering, Ming Chi University of Technology, 84 Gungjuan Rd., Taishan Dist., New Taipei City, 24301, Taiwan; Center for Environmental Sustainability and Human Health, Ming Chi University of Technology, 84 Gungjuan Rd., Taishan Dist., New Taipei City, 24301, Taiwan
| | - Kai-Hsien Chi
- Institute of Environmental and Occupational Health Sciences, National Yang-Ming University, 1 Daxue Road., East District., Tainan City, 701, Taiwan
| | - Chih-Da Wu
- Department of Geomatics, National Cheng Kung University, Tainan, Taiwan
| | - Sheng-Lun Lin
- Department of Civil Engineering and Geomatics, Cheng Shiu University, 840, Chengqing Road, Niaosong District, Kaohsiung City, 833, Taiwan
| | - Wen-Chang Hsu
- Department of Civil Engineering and Resource Management, Dahan Institute of Technology, 1 Shuren Street, Xincheng Township, Hualien County, 971, Taiwan
| | - Chun-Chieh Tseng
- Department of Public Health, Tzu Chi University, 701, Zhongyang Road, Hualien City, Hualien County, 970, Taiwan
| | - Mu-Jean Chen
- National Institute of Environmental Health Sciences, National Health Research Institutes, 35 Keyan Road, Zhunan Town, Miaoli, 35053, Taiwan
| | - Yu-Cheng Chen
- National Institute of Environmental Health Sciences, National Health Research Institutes, 35 Keyan Road, Zhunan Town, Miaoli, 35053, Taiwan; Department of Occupational Safety and Health, China Medical University, 91 Hsueh-Shih Road, Taichung, 40402, Taiwan.
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7
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Rheinberger CM. A Unified Probabilistic Framework for Cancer Risk Management. RISK ANALYSIS : AN OFFICIAL PUBLICATION OF THE SOCIETY FOR RISK ANALYSIS 2021; 41:584-595. [PMID: 33340129 DOI: 10.1111/risa.13666] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 10/28/2020] [Accepted: 12/06/2020] [Indexed: 06/12/2023]
Abstract
Cancer risk assessments in the regulatory realm are often deterministic. Probabilistic approaches that allow characterizing and propagating uncertainty and variability are better suited to predict the socioeconomic impacts of regulating carcinogens. In this article, I present a unified framework for cancer risk management consisting of (i) a probabilistic exposure model that takes into account variability in individual exposure to the substance of concern; (ii) a probabilistic dose-response model that accounts for differences in individual cancer susceptibility; (iii) an impact assessment model that quantifies individuals' excess lifetime cancer risk; and (iv) a welfare model that values changes in disability-adjusted life expectancy based on workers' willingness-to-pay and aggregates individual valuations across the population at risk. I illustrate the framework with data on occupational exposure to hexavalent chromium in France. In a cohort of 10,000 synthetic workers, about one third of the exposed benefit from the introduction of a binding occupational exposure limit (BOEL). Limiting hexavalent chromium exposure to the BOEL reduces the statistical worker's excess lifetime risk of fatal and nonfatal lung cancer by 4.7E-3 and 1.5E-3, respectively. At cohort level, the risk reduction corresponds to 738.4 full and 30.7 disability-adjusted life years saved. The expected welfare gain of introducing the BOEL is close to €30 million. A major advantage of the framework is its ability to visualize uncertainty and variability inherent to cancer risk assessment. Notwithstanding some implementation challenges, the framework provides a transparent characterization of regulatory impacts that supports informed risk management decisions.
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Affiliation(s)
- Christoph M Rheinberger
- Risk Management Directorate, European Chemicals Agency, Postal address: P.O. Box 400, Helsinki, 00121, Finland
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8
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Singh P, Itankar N, Patil Y. Biomanagement of hexavalent chromium: Current trends and promising perspectives. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 279:111547. [PMID: 33190974 DOI: 10.1016/j.jenvman.2020.111547] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 08/27/2020] [Accepted: 10/19/2020] [Indexed: 06/11/2023]
Abstract
Chromium (Cr) is most widely used heavy metal with vast applications in industrial sectors such as metallurgy, automobile, leather, electroplating, etc. Subsequently, these industries discharge large volumes of toxic Cr containing industrial wastewaters without proper treatment/management into the environment, causing severe damage to human health and ecology. This review gives some novel insights on the existing, successful and promising bio-based approaches for Cr remediation. In lieu of the multiple limitations of the physical and chemical methods for remediation, various biological means have been deciphered, wherein dead and live biomass have shown immense capabilities of removing/reducing and/or remediating Cr from polluted environmental niches. Adsorption of Cr by various agro-based waste and reduction/precipitation by different microbial groups have shown promising results in chromium removal/recovery. Various microbial based agents and aquatic plants like duckweeds are emerging as efficient adsorbents of metals and their role in chromium bioremediation is an effective green technology that needs to be harnessed effectively. The role of iron and sulphur reducing bacteria have shown potential for enhanced Cr remediation. Biosurfactants have revealed immense scope as enhancers of microbial metal bioremediation and have been reported to have potential for use in chromium recovery as well. The authors also explore the combined use of biochar and biosurfactants as a potential strategy for chromium bioremediation for the development of technology worth adopting. Cr is non-renewable and finite resource, therefore its safe removal/recovery from wastes is of major significance for achieving social, economic and environmental sustainability.
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Affiliation(s)
- Pooja Singh
- Symbiosis School of Biological Sciences, Symbiosis International (Deemed University), Pune, India
| | - Nilisha Itankar
- Symbiosis Institute of Technology, Symbiosis International (Deemed University), Pune, India
| | - Yogesh Patil
- Symbiosis Centre for Research and Innovation, Symbiosis International (Deemed University), Pune, India.
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9
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O'Shea MJ, Vigliaturo R, Choi JK, McKeon TP, Krekeler MPS, Gieré R. Alteration of yellow traffic paint in simulated environmental and biological fluids. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 750:141202. [PMID: 32853929 PMCID: PMC7657991 DOI: 10.1016/j.scitotenv.2020.141202] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 07/16/2020] [Accepted: 07/21/2020] [Indexed: 05/27/2023]
Abstract
Pollution from heavy metals in urban environments is a topic of growing concern because many metals, including Pb and Cr, are a human health hazard. Exposure to Pb and Cr has been linked to the inhibition of neurological development as well as toxic effects on many organs. Yellow traffic paint (YTP) is a mixture that contains organic polymers, binders, and pigments, which in some cases consist of crocoite (PbCrO4) that may be coated by silica. The primary aim of this study was to investigate the behavior of the crocoite pigment grains within YTP and their silica coatings in simulated environmental and human body conditions. To do this, both YTP and asphalt were collected in Philadelphia, PA, USA. These samples as well as a standard PbCrO4 were investigated with powder X-ray diffraction, X-ray fluorescence, environmental scanning electron microscopy (ESEM), transmission electron microscopy, and energy-dispersive X-ray spectroscopy. Using this multi-analytical approach, mineral phases were determined in the YTP, their shape, dimensional distributions, crystallinity, and chemical composition, as well as elemental distributions before and after experimental interactions. Three batch dissolution experiments with YTP, asphalt, and standard PbCrO4 were performed to simulate ingestion, inhalation, and environmental interaction with rainwater. Elemental releases were determined with inductively coupled plasma-optical emission spectrometry, and results indicated that little (ingestion) to no (environmental and inhalation) Pb and Cr were leached from the YTP during the three experimental procedures. This is likely due to the silica coating that encapsulates the crocoite particles, which persisted during all interactions. The ESEM results for YTP showed dimensional reductions after interactions with all three fluids. The silica coating must be further explored to determine how it breaks down in real environmental conditions.
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Affiliation(s)
- Michael J O'Shea
- Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, PA 19104-6316, USA.
| | - Ruggero Vigliaturo
- Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, PA 19104-6316, USA
| | - Jessica K Choi
- Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, PA 19104-6316, USA
| | - Thomas P McKeon
- Center of Excellence in Environmental Toxicology, University of Pennsylvania, Philadelphia, PA 19104-6316, USA
| | - Mark P S Krekeler
- Department of Geology and Environmental Earth Science, Miami University Hamilton, Hamilton, OH 45011, USA; Department of Geology and Environmental Earth Science, Miami University, Oxford, OH 45056, USA
| | - Reto Gieré
- Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, PA 19104-6316, USA; Center of Excellence in Environmental Toxicology, University of Pennsylvania, Philadelphia, PA 19104-6316, USA
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Wang G, Zhang C, Huang B. Transcriptome analysis and histopathological observations of Geloina erosa gills upon Cr(VI) exposure. Comp Biochem Physiol C Toxicol Pharmacol 2020; 231:108706. [PMID: 31927119 DOI: 10.1016/j.cbpc.2020.108706] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Revised: 12/09/2019] [Accepted: 12/21/2019] [Indexed: 10/25/2022]
Abstract
The heavy metal contamination like Cr(VI) has been increased by human activities and that threats the ecosystem health of mangrove areas. Bioindicator is an emerging tool in the environmental contamination assessment. The objective of this study was to investigate the Geloina erosa response mechanisms and sensitivities of several biomarkers in the Cr(VI) exposure and identify the G. erosa capability of being used as heavy metals bioindicator. In this study, G. erosa was exposed to 100 μmol·L-1 Cr(VI) for 48 h. After transcriptome sequencing, a total of 134,817 unigenes were obtained, including 12,555 up-regulated and 18,829 down-regulated differentially expressed genes and were validated through quantitative real-time PCR. In addition, a total of 12,185 SSRs and 1,428,214 candidate SNPs were identified from all the G. erosa transcriptome libraries. Histopathology of the gill indicated the Cr(VI) exposure induced damage of the organ leading to its immunization, detoxification or apoptosis reactions. Among eight genes of the selected biomarkers, Calm, HSP70, CYP450, ATG5, TLR2, MYD88 and CASP8 were up-regulated, while TLR4 was down-regulated in response to the Cr(VI) exposure.
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Affiliation(s)
- Gongsi Wang
- College of Marine Sciences, Hainan University, Haikou, Hainan 570228,PR China; Key Laboratory of Tropical Hydrobiology and Biotechnology of Hainan Province, Haikou, Hainan 570228, PR China; Key Laboratory of Tropical Biological Resources in Hainan University, Haikou, Hainan 570228, PR China
| | - Chengkai Zhang
- College of Marine Sciences, Hainan University, Haikou, Hainan 570228,PR China; Key Laboratory of Tropical Hydrobiology and Biotechnology of Hainan Province, Haikou, Hainan 570228, PR China; Key Laboratory of Tropical Biological Resources in Hainan University, Haikou, Hainan 570228, PR China
| | - Bo Huang
- College of Marine Sciences, Hainan University, Haikou, Hainan 570228,PR China; Key Laboratory of Tropical Hydrobiology and Biotechnology of Hainan Province, Haikou, Hainan 570228, PR China; Key Laboratory of Tropical Biological Resources in Hainan University, Haikou, Hainan 570228, PR China.
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Nafti M, Hannachi C, Hsaini J, Hamrouni B, Nouaïgui H. An economic and sensitive method for extracting chromium speciation in airborne inhalable dust, using a green sample treatment coupled with electrothermal atomic absorption. SEP SCI TECHNOL 2019. [DOI: 10.1080/01496395.2019.1653918] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Mariem Nafti
- Faculty of Sciences of Tunis, UR11ES17 Desalination and Water Treatment, University of Tunis El Manar, Tunis, Tunisia
- Tunisian Occupational Safety & Health Institute, Occupational Health and Working Environment, Tunis, Tunisia
| | - Chiraz Hannachi
- Faculty of Sciences of Tunis, UR11ES17 Desalination and Water Treatment, University of Tunis El Manar, Tunis, Tunisia
| | - Jaber Hsaini
- Faculty of Sciences of Tunis, UR11ES17 Desalination and Water Treatment, University of Tunis El Manar, Tunis, Tunisia
| | - Béchir Hamrouni
- Faculty of Sciences of Tunis, UR11ES17 Desalination and Water Treatment, University of Tunis El Manar, Tunis, Tunisia
| | - Habib Nouaïgui
- Tunisian Occupational Safety & Health Institute, Occupational Health and Working Environment, Tunis, Tunisia
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12
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Tseng CH, Lee IH, Chen YC. Evaluation of hexavalent chromium concentration in water and its health risk with a system dynamics model. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 669:103-111. [PMID: 30878918 DOI: 10.1016/j.scitotenv.2019.03.103] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Revised: 03/07/2019] [Accepted: 03/07/2019] [Indexed: 06/09/2023]
Abstract
This study is the first to use reliable data sources to establish a reasonable mass balance of Cr(VI) contamination in river water, sediment, and farmland soil. A system dynamics model was used to establish the interrelationships among water, Cr(VI) contamination, and health effects in the Wu River watershed (between Taichung city and Changhua county) between 2018 and 2048 (30 years). The results show very little Cr(VI) contamination in rivers; most flowed downstream or settled in sediment, and the accumulation of Cr(VI) in the sediment increased throughout the study period. The highest Cr(VI) concentrations in farmland soil (338.46 mg/kg) were reached in Changhua county as a result of greater Cr(VI) contamination from upstream and local factories. This Cr(VI) contamination led to gastric cancer risks of 5.24 × 10-4 and 4.38 × 10-6 in Changhua county and Taichung city, respectively. Although most of the Cr(VI) contamination was discharged from Taichung City, greater health risks and losses occurred downstream in Changhua county; medical costs were 55 times higher. For total quality control, a reduction rate of at least 68% should be reached in the study area. These findings will be helpful in predicting the transmission of Cr(VI) contamination over long study periods with a systematic model.
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Affiliation(s)
- Chao-Heng Tseng
- Institute of Environmental Engineering and Management, National Taipei University of Technology, Taipei City 106, Taiwan, ROC
| | - I-Hsuan Lee
- Institute of Environmental Engineering and Management, National Taipei University of Technology, Taipei City 106, Taiwan, ROC
| | - Ying-Chu Chen
- Department of Civil Engineering, National Taipei University of Technology, Taipei City 106, Taiwan, ROC.
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Meza-Figueroa D, González-Grijalva B, Romero F, Ruiz J, Pedroza-Montero M, Rivero CID, Acosta-Elías M, Ochoa-Landin L, Navarro-Espinoza S. Source apportionment and environmental fate of lead chromates in atmospheric dust in arid environments. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 630:1596-1607. [PMID: 29554776 DOI: 10.1016/j.scitotenv.2018.02.285] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Revised: 02/22/2018] [Accepted: 02/23/2018] [Indexed: 06/08/2023]
Abstract
The environmental fate of lead derived from traffic paint has been poorly studied in developing countries, mainly in arid zones. For this purpose, a developing city located in the Sonoran desert (Hermosillo, Mexico), was chosen to conduct a study. In this paper the lead chromate (crocoite) sources in atmospheric dust were addressed using a combination of Raman microspectroscopy, X-ray diffraction, scanning electron microscopy (SEM), and Pb isotope measurements. A high concentration of Pb and Cr as micro- and nanostructured pigments of crocoite is reported in yellow traffic paint (n=80), road dust (n=146), settled dust in roofs (n=21), and atmospheric dust (n=20) from a developing city located in the Sonoran Desert. 10 samples of peri-urban soils were collected for local geochemical background. The paint photodegradation and erosion of the asphaltic cover are enhanced by the climate, and the presence of the mineral crocoite (PbCrO4) in road dust with an aerodynamic diameter ranging from 100nm to 2μm suggests its integration into the atmosphere by wind resuspension processes. A positive PbCr correlation (R2=0.977) was found for all studied samples, suggesting a common source. The Pb-isotope data show signatures in atmospheric dust as a product of the mixing of two end members: i) local soils and ii) crocoite crystals as pigments in paint. The presence of lead chromates in atmospheric dust has not been previously documented in Latin America, and it represents an unknown health risk to the exposed population because the identified size of crystals can reach the deepest part of lungs.
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Affiliation(s)
- Diana Meza-Figueroa
- Department of Geology. University of Sonora, Rosales y Encinas, Hermosillo, Sonora 83000, Mexico; Department of Geology. Graduate Program, Rosales y Encinas, Hermosillo, Sonora 83000, Mexico.
| | - Belem González-Grijalva
- Earth Sciences Graduate Program. Institute of Geology, National University of Mexico. Colosio y Madrid, Hermosillo, Sonora 83240, Mexico
| | - Francisco Romero
- Institute of Geology. National University of Mexico, Ciudad Universitaria, Delegación Coyoacán, Ciudad de México 04510, Mexico; Department of Geology. Graduate Program, Rosales y Encinas, Hermosillo, Sonora 83000, Mexico
| | - Joaquin Ruiz
- Department of Geosciences, The University of Arizona, 1040 E. 4thSt, Gould-Simpson Building 77, Tucson, AZ 85721, United States
| | - Martín Pedroza-Montero
- Department of Physics Research, University of Sonora, Rosales y Encinas, Hermosillo, Sonora 83000, Mexico
| | | | - Mónica Acosta-Elías
- Department of Physics Research, University of Sonora, Rosales y Encinas, Hermosillo, Sonora 83000, Mexico
| | - Lucas Ochoa-Landin
- Department of Geology. University of Sonora, Rosales y Encinas, Hermosillo, Sonora 83000, Mexico; Laboratorio Nacional de Geoquímica y Mineralogía-LANGEM, Mexico
| | - Sofía Navarro-Espinoza
- Department of Geology. Graduate Program, Rosales y Encinas, Hermosillo, Sonora 83000, Mexico
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14
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Kauermann G, Becher H, Maier V. Exploring the statistical uncertainty in acceptable exposure limit values for hexavalent chromium exposure. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2018; 28:69-75. [PMID: 28513604 DOI: 10.1038/jes.2017.4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 06/29/2016] [Accepted: 07/05/2016] [Indexed: 06/07/2023]
Abstract
Exposure limit values give the exposure level at which an accepted (or acceptable) number of additional work related diseases are expected. The values are derived from dose-response curves and carry a large amount of uncertainty. In this paper we aim to quantify some of this uncertainty with statistical means. We explore the limit value issued by the European Chemical Agency (ECHA) for occupational exposure to hexavalent chromium, CR(VI). We investigate how the dose-response model and statistical estimation variability influences the data-based fixation of exposure limit values. We also look at the effect of measurement variation on the exposure level itself, where simulation techniques allow to quantify the uncertainty in statistical terms. We demonstrate that statistical uncertainty needs to be taken into account when fixing exposure limit values based on data.
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Affiliation(s)
- Göran Kauermann
- Chair of Statistics-in Economics, Business Administration and Social Sciences, Ludwig-Maximilians-University of Munich, Munich, Germany
| | - Heiko Becher
- Department of Medical Biometry and Epidemiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Verena Maier
- Chair of Statistics-in Economics, Business Administration and Social Sciences, Ludwig-Maximilians-University of Munich, Munich, Germany
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15
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Chen G, Gao Z, Chu W, Cao Z, Li C, Zhao H. Effects of chromium picolinate on fat deposition, activity and genetic expression of lipid metabolism-related enzymes in 21 day old Ross broilers. ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES 2017; 31:569-575. [PMID: 28830127 PMCID: PMC5838330 DOI: 10.5713/ajas.17.0289] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/15/2017] [Revised: 06/05/2017] [Accepted: 08/21/2017] [Indexed: 01/04/2023]
Abstract
Objective This experiment was conducted to investigate the effects of chromium picolinate (CrP) on fat deposition, genetic expression and enzymatic activity of lipid metabolism-related enzymes. Methods Two hundred forty one-day-old Ross broilers were randomly divided into 5 groups with 4 replicates per group and 12 Ross broiler chicks per replicate. The normal control group was fed a basal diet, and the other groups fed the same basal diet supplemented with 0.1, 0.2, 0.4, and 0.8 mg/kg CrP respectively. The experiment lasted for 21 days. Results Added CrP in the basal diet decreased the abdominal fat, had no effects on subcutaneous fat thickness and inter-muscular fat width; 0.2 mg/kg CrP significantly decreased the fatty acid synthase (FAS) enzymatic (p<0.05); acetyl-CoA carboxylase (ACC) enzymatic activity decreased in all CrP groups (p<0.05); hormone-sensitive lipase (HSL) enzymatic activity also decreased, but the change was not significant (p>0.05); 0.4 mg/kg CrP group significantly decreased the lipoprotein lipase (LPL) enzymatic activity. FAS mRNA expression increased in all experimental groups, and the LPL mRNA expression significantly increased in all experimental groups (p<0.05), but not 0.2 mg/kg CrP group. Conclusion The results indicated that adding CrP in basal diet decreased the abdominal fat percentage, had no effects on subcutaneous fat thickness and inter-muscular fat width, decreased the enzymatic activity of FAS, ACC, LPL and HSL and increased the genetic expression levels of FAS and LPL.
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Affiliation(s)
- Guangxin Chen
- State Key Laboratory of Special Animal Molecular Biology, Changchun 130112, China.,Institute of Special Animal and Plant Sciences of Chinese Academy of Agricultural Sciences, Changchun 130112, China.,College of Agriculture, Guangdong Ocean University, Zhanjiang 524000, China
| | - Zhenhua Gao
- College of Agriculture, Guangdong Ocean University, Zhanjiang 524000, China
| | - Wenhui Chu
- State Key Laboratory of Special Animal Molecular Biology, Changchun 130112, China.,Institute of Special Animal and Plant Sciences of Chinese Academy of Agricultural Sciences, Changchun 130112, China
| | - Zan Cao
- College of Agriculture, Guangdong Ocean University, Zhanjiang 524000, China
| | - Chunyi Li
- State Key Laboratory of Special Animal Molecular Biology, Changchun 130112, China.,Institute of Special Animal and Plant Sciences of Chinese Academy of Agricultural Sciences, Changchun 130112, China
| | - Haiping Zhao
- State Key Laboratory of Special Animal Molecular Biology, Changchun 130112, China.,Institute of Special Animal and Plant Sciences of Chinese Academy of Agricultural Sciences, Changchun 130112, China
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16
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Filova E, Vandrovcova M, Jelinek M, Zemek J, Houdkova J, Kocourek T, Stankova L, Bacakova L. Adhesion and differentiation of Saos-2 osteoblast-like cells on chromium-doped diamond-like carbon coatings. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2017; 28:17. [PMID: 28000113 DOI: 10.1007/s10856-016-5830-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Accepted: 12/08/2016] [Indexed: 06/06/2023]
Abstract
Diamond-like carbon (DLC) thin films are promising for use in coating orthopaedic, dental and cardiovascular implants. The problem of DLC layers lies in their weak layer adhesion to metal implants. Chromium is used as a dopant for improving the adhesion of DLC films. Cr-DLC layers were prepared by a hybrid technology, using a combination of pulsed laser deposition (PLD) from a graphite target and magnetron sputtering. Depending on the deposition conditions, the concentration of Cr in the DLC layers moved from zero to 10.0 at.%. The effect of DLC layers with 0.0, 0.9, 1.8, 7.3, 7.7 and 10.0 at.% Cr content on the adhesion and osteogenic differentiation of human osteoblast-like Saos-2 cells was assessed in vitro. The DLC samples that contained 7.7 and 10.0 at.% of Cr supported cell spreading on day 1 after seeding. On day three after seeding, the most apparent vinculin-containing focal adhesion plaques were also found on samples with higher concentrations of chromium. On the other hand, the expression of type I collagen and alkaline phosphatase at the mRNA and protein level was the highest on Cr-DLC samples with a lower concentration of Cr (0-1.8 at.%). We can conclude that higher concentrations of chromium supported cell adhesion; however DLC and DLC doped with a lower concentration of chromium supported osteogenic cell differentiation.
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Affiliation(s)
- Elena Filova
- Department of Biomaterials and Tissue Engineering, Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, 142 20, Prague 4, Czech Republic
| | - Marta Vandrovcova
- Department of Biomaterials and Tissue Engineering, Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, 142 20, Prague 4, Czech Republic.
| | - Miroslav Jelinek
- Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21, Prague 8, Czech Republic
- Czech Technical University in Prague, Faculty of Biomedical Engineering, Nam. Sitna 3105, 272 01, Kladno, Czech Republic
| | - Josef Zemek
- Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21, Prague 8, Czech Republic
| | - Jana Houdkova
- Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21, Prague 8, Czech Republic
| | - Tomas Kocourek
- Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21, Prague 8, Czech Republic
- Czech Technical University in Prague, Faculty of Biomedical Engineering, Nam. Sitna 3105, 272 01, Kladno, Czech Republic
| | - Lubica Stankova
- Department of Biomaterials and Tissue Engineering, Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, 142 20, Prague 4, Czech Republic
| | - Lucie Bacakova
- Department of Biomaterials and Tissue Engineering, Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, 142 20, Prague 4, Czech Republic
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17
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Proctor DM, Suh M, Mittal L, Hirsch S, Valdes Salgado R, Bartlett C, Van Landingham C, Rohr A, Crump K. Inhalation cancer risk assessment of hexavalent chromium based on updated mortality for Painesville chromate production workers. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2016; 26:224-31. [PMID: 26669850 PMCID: PMC4756268 DOI: 10.1038/jes.2015.77] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Revised: 10/08/2015] [Accepted: 10/13/2015] [Indexed: 05/05/2023]
Abstract
The exposure-response for hexavalent chromium (Cr(VI))-induced lung cancer among workers of the Painesville Ohio chromate production facility has been used internationally for quantitative risk assessment of environmental and occupational exposures to airborne Cr(VI). We updated the mortality of 714 Painesville workers (including 198 short-term workers) through December 2011, reconstructed exposures, and conducted exposure-response modeling using Poisson and Cox regressions to provide quantitative lung cancer risk estimates. The average length of follow-up was 34.4 years with 24,535 person-years at risk. Lung cancer was significantly increased for the cohort (standardized mortality ratio (SMR)=186; 95% confidence interval (CI) 145-228), for those hired before 1959, those with >30-year tenure, and those with cumulative exposure >1.41 mg/m(3)-years or highest monthly exposures >0.26 mg/m(3). Of the models assessed, the linear Cox model with unlagged cumulative exposure provided the best fit and was preferred. Smoking and age at hire were also significant predictors of lung cancer mortality. Adjusting for these variables, the occupational unit risk was 0.00166 (95% CI 0.000713-0.00349), and the environmental unit risk was 0.00832 (95% CI 0.00359-0.0174), which are 20% and 15% lower, respectively, than values developed in a previous study of this cohort.
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Affiliation(s)
| | - Mina Suh
- ToxStrategies, Mission Viejo, California, USA
| | | | | | | | | | | | - Annette Rohr
- Electric Power Research Institute, Palo Alto, California, USA
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18
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Feng W, Zhang W, Zhao T, Mao G, Wang W, Wu X, Zhou Z, Huang J, Bao Y, Yang L, Wu X. Evaluation of the Reproductive Toxicity, Glycometabolism, Glycometabolism-Related Enzyme Levels and Lipid Metabolism of Chromium Malate Supplementation in Sprague-Dawley Rats. Biol Trace Elem Res 2015; 168:150-68. [PMID: 25876088 DOI: 10.1007/s12011-015-0336-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Accepted: 04/06/2015] [Indexed: 11/27/2022]
Abstract
Our previous study showed that chromium malate improved the regulation of blood glucose in mice with alloxan-induced diabetes. The present study was designed to evaluate the reproductive toxicity of chromium malate in Sprague-Dawley rats and then inspected the effect of chromium malate on glycometabolism, glycometabolism-related enzymes, and lipid metabolism. The results showed that no pathological, toxic feces and urine changes were observed in clinical signs of parental and fetal rats in chromium malate groups. The fasting blood glucose, serum insulin, insulin resistance index, C-peptide, hepatic glycogen, glucose-6-phosphate dehydrogenase, glucokinase, total cholesterol, low-density lipoprotein cholesterol, high-density lipoprotein cholesterol, and triglyceride levels of chromium malate groups have no significant change compared with control group and chromium picolinate group. The serum and organ contents of Cr in chromium malate groups have no significant change when compared with control group. No measurable damage on liver, brain, kidney, and testis/uterus of chromium malate groups was found. No significant change in body mass, absolute and relative organ weights, and hematological and biochemical changes of rats were observed compared with the control and chromium picolinate groups. The results indicated that supplements with chromium malate does not cause obvious damage and has no obvious effect on glycometabolism, glycometabolism-related enzyme, and lipid metabolism on female and male rats. The results of this study suggested that chromium malate is safe for human consumption and has the potential for application as a functional food ingredient and dietary supplement.
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Affiliation(s)
- Weiwei Feng
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Rd., Zhenjiang, 212013, Jiangsu, China
| | - Weijie Zhang
- School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Rd., Zhenjiang, 212013, Jiangsu, China
| | - Ting Zhao
- School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Rd., Zhenjiang, 212013, Jiangsu, China
| | - Guanghua Mao
- School of the Environment and Safety Engineering, Jiangsu University, 301 Xuefu Rd., Zhenjiang, 212013, Jiangsu, China
| | - Wei Wang
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Rd., Zhenjiang, 212013, Jiangsu, China
| | - Xueshan Wu
- School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Rd., Zhenjiang, 212013, Jiangsu, China
| | - Zhaoxiang Zhou
- School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Rd., Zhenjiang, 212013, Jiangsu, China
| | - Jing Huang
- School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Rd., Zhenjiang, 212013, Jiangsu, China
| | - Yongtuan Bao
- School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Rd., Zhenjiang, 212013, Jiangsu, China
| | - Liuqing Yang
- School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Rd., Zhenjiang, 212013, Jiangsu, China.
| | - Xiangyang Wu
- School of the Environment and Safety Engineering, Jiangsu University, 301 Xuefu Rd., Zhenjiang, 212013, Jiangsu, China.
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Sampaio CDG, Frota LS, Magalhães HS, Dutra LM, Queiroz DC, Araújo RS, Becker H, de Souza JR, Ricardo NM, Trevisan MT. Chitosan/mangiferin particles for Cr(VI) reduction and removal. Int J Biol Macromol 2015; 78:273-9. [DOI: 10.1016/j.ijbiomac.2015.03.038] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Revised: 02/27/2015] [Accepted: 03/15/2015] [Indexed: 11/27/2022]
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20
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Jelinek M, Kocourek T, Zemek J, Mikšovský J, Kubinová Š, Remsa J, Kopeček J, Jurek K. Chromium-doped DLC for implants prepared by laser-magnetron deposition. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 46:381-6. [PMID: 25492001 DOI: 10.1016/j.msec.2014.10.035] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Revised: 08/29/2014] [Accepted: 10/19/2014] [Indexed: 11/24/2022]
Abstract
Diamond-like carbon (DLC) thin films are frequently used for coating of implants. The problem of DLC layers lies in bad layer adhesion to metal implants. Chromium is used as a dopant for improvement of adhesion of DLC films. DLC and Cr-DLC layers were deposited on silicon, Ti6Al4V and CoCrMo substrates by a hybrid technology using combination of pulsed laser deposition (PLD) and magnetron sputtering. The topology of layers was studied using SEM, AFM and mechanical profilometer. Carbon and chromium content and concentration of trivalent and toxic hexavalent chromium bonds were determined by XPS and WDS. It follows from the scratch tests that Cr doping improved adhesion of DLC layers. Ethylene glycol, diiodomethane and deionized water were used to measure the contact angles. The surface free energy (SFE) was calculated. The antibacterial properties were studied using Pseudomonas aeruginosa and Staphylococcus aureus bacteria. The influence of SFE, hydrophobicity and surface roughness on antibacterial ability of doped layers is discussed.
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Affiliation(s)
- Miroslav Jelinek
- Institute of Physics AS CR, Na Slovance 2, 182 21 Praha 8, Czech Republic; Czech Technical University in Prague, Faculty of Biomedical Engineering, nam. Sitna 3105, 27201 Kladno, Czech Republic.
| | - Tomáš Kocourek
- Institute of Physics AS CR, Na Slovance 2, 182 21 Praha 8, Czech Republic; Czech Technical University in Prague, Faculty of Biomedical Engineering, nam. Sitna 3105, 27201 Kladno, Czech Republic
| | - Josef Zemek
- Institute of Physics AS CR, Na Slovance 2, 182 21 Praha 8, Czech Republic
| | - Jan Mikšovský
- Institute of Physics AS CR, Na Slovance 2, 182 21 Praha 8, Czech Republic; Czech Technical University in Prague, Faculty of Biomedical Engineering, nam. Sitna 3105, 27201 Kladno, Czech Republic
| | - Šárka Kubinová
- Institute of Experimental Medicine ASCR, Vídeňská 1083, 14220 Praha 4, Czech Republic
| | - Jan Remsa
- Institute of Physics AS CR, Na Slovance 2, 182 21 Praha 8, Czech Republic; Czech Technical University in Prague, Faculty of Biomedical Engineering, nam. Sitna 3105, 27201 Kladno, Czech Republic
| | - Jaromir Kopeček
- Institute of Physics AS CR, Na Slovance 2, 182 21 Praha 8, Czech Republic
| | - Karel Jurek
- Institute of Physics AS CR, Na Slovance 2, 182 21 Praha 8, Czech Republic
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Proctor DM, Suh M, Campleman SL, Thompson CM. Assessment of the mode of action for hexavalent chromium-induced lung cancer following inhalation exposures. Toxicology 2014; 325:160-79. [PMID: 25174529 DOI: 10.1016/j.tox.2014.08.009] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Revised: 07/30/2014] [Accepted: 08/24/2014] [Indexed: 12/23/2022]
Abstract
Inhalation of hexavalent chromium [Cr(VI)] is associated with increased lung cancer risk among workers in several industries, most notably chromate production workers exposed to high concentrations of Cr(VI) (≥100 μg/m(3)), for which clear exposure-response relationships and respiratory irritation and tissue damage have been reported. Data from this industry are used to assess lung cancer risk associated with environmental and current occupational exposures, occurring at concentrations that are significantly lower. There is considerable uncertainty in the low dose extrapolation of historical occupational epidemiology data to assess risk at current exposures because no published or well recognized mode of action (MOA) for Cr(VI)-induced lung tumors exists. We conducted a MOA analysis for Cr(VI)-induced lung cancer evaluating toxicokinetic and toxicological data in humans and rodents and mechanistic data to assess plausibility, dose-response, and temporal concordance for potential MOAs. Toxicokinetic data support that extracellular reduction of Cr(VI), which limits intracellular absorption of Cr(VI) and Cr(VI)-induced toxicity, can be overwhelmed at high exposure levels. In vivo genotoxicity and mutagenicity data are mostly negative and do not support a mutagenic MOA. Further, both chronic bioassays and the epidemiologic literature support that lung cancer occurs at exposures that cause tissue damage. Based on this MOA analysis, the overall weight of evidence supports a MOA involving deposition and accumulation of particulate chromium in the bifurcations of the lung resulting in exceedance of clearance mechanisms and cellular absorption of Cr(VI). Once inside the cell, reduction of Cr(VI) results in oxidative stress and the formation of Cr ligands. Subsequent protein and DNA damage lead to tissue irritation, inflammation, and cytotoxicity. These effects, concomitant with increased cell proliferation, result in changes to DNA sequences and/or methylation status that can lead to tumorigenesis. This MOA supports the use of non-linear approaches when extrapolating lung cancer risk occurring at high concentration occupational exposures to environmentally-relevant exposures.
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Affiliation(s)
| | - Mina Suh
- ToxStrategies, Inc., Mission Viejo, CA 92692, United States.
| | - Sharan L Campleman
- University of California, Office of the President, Oakland, CA 94612, United States.
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