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Aurisano N, Fantke P, Chiu WA, Judson R, Jang S, Unnikrishnan A, Jolliet O. Probabilistic Reference and 10% Effect Concentrations for Characterizing Inhalation Non-cancer and Developmental/Reproductive Effects for 2,160 Substances. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:8278-8288. [PMID: 38697947 PMCID: PMC11097392 DOI: 10.1021/acs.est.4c00207] [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: 01/25/2024] [Revised: 04/22/2024] [Accepted: 04/23/2024] [Indexed: 05/05/2024]
Abstract
Chemicals assessment and management frameworks rely on regulatory toxicity values, which are based on points of departure (POD) identified following rigorous dose-response assessments. Yet, regulatory PODs and toxicity values for inhalation exposure (i.e., reference concentrations [RfCs]) are available for only ∼200 chemicals. To address this gap, we applied a workflow to determine surrogate inhalation route PODs and corresponding toxicity values, where regulatory assessments are lacking. We curated and selected inhalation in vivo data from the U.S. EPA's ToxValDB and adjusted reported effect values to chronic human equivalent benchmark concentrations (BMCh) following the WHO/IPCS framework. Using ToxValDB chemicals with existing PODs associated with regulatory toxicity values, we found that the 25th %-ile of a chemical's BMCh distribution (POD p 25 BMC h ) could serve as a suitable surrogate for regulatory PODs (Q2 ≥ 0.76, RSE ≤ 0.82 log10 units). We applied this approach to derive POD p 25 BMC h for 2,095 substances with general non-cancer toxicity effects and 638 substances with reproductive/developmental toxicity effects, yielding a total coverage of 2,160 substances. From these POD p 25 BMC h , we derived probabilistic RfCs and human population effect concentrations. With this work, we have expanded the number of chemicals with toxicity values available, thereby enabling a much broader coverage for inhalation risk and impact assessment.
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Affiliation(s)
- Nicolò Aurisano
- Quantitative
Sustainability Assessment, Department of Environmental and Resource
Engineering, Technical University of Denmark, Bygningstorvet 115, Kgs., Lyngby 2800, Denmark
| | - Peter Fantke
- Quantitative
Sustainability Assessment, Department of Environmental and Resource
Engineering, Technical University of Denmark, Bygningstorvet 115, Kgs., Lyngby 2800, Denmark
| | - Weihsueh A. Chiu
- Department
of Veterinary Integrative Biosciences, College of Veterinary Medicine
and Biomedical Sciences, Texas A&M University, College Station, Texas 77843, United
States
| | - Richard Judson
- National
Center for Computational Toxicology, U.S.
Environmental Protection Agency, Research Triangle Park, Durham, North Carolina 27711, United States
| | - Suji Jang
- Department
of Veterinary Integrative Biosciences, College of Veterinary Medicine
and Biomedical Sciences, Texas A&M University, College Station, Texas 77843, United
States
| | - Aswani Unnikrishnan
- National
Center for Computational Toxicology, U.S.
Environmental Protection Agency, Research Triangle Park, Durham, North Carolina 27711, United States
| | - Olivier Jolliet
- Quantitative
Sustainability Assessment, Department of Environmental and Resource
Engineering, Technical University of Denmark, Bygningstorvet 115, Kgs., Lyngby 2800, Denmark
- Department
of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, Michigan 48109, United States
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2
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Kvasnicka J, Aurisano N, von Borries K, Lu EH, Fantke P, Jolliet O, Wright FA, Chiu WA. Two-Stage Machine Learning-Based Approach to Predict Points of Departure for Human Noncancer and Developmental/Reproductive Effects. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024. [PMID: 38693844 DOI: 10.1021/acs.est.4c00172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2024]
Abstract
Chemical points of departure (PODs) for critical health effects are crucial for evaluating and managing human health risks and impacts from exposure. However, PODs are unavailable for most chemicals in commerce due to a lack of in vivo toxicity data. We therefore developed a two-stage machine learning (ML) framework to predict human-equivalent PODs for oral exposure to organic chemicals based on chemical structure. Utilizing ML-based predictions for structural/physical/chemical/toxicological properties from OPERA 2.9 as features (Stage 1), ML models using random forest regression were trained with human-equivalent PODs derived from in vivo data sets for general noncancer effects (n = 1,791) and reproductive/developmental effects (n = 2,228), with robust cross-validation for feature selection and estimating generalization errors (Stage 2). These two-stage models accurately predicted PODs for both effect categories with cross-validation-based root-mean-squared errors less than an order of magnitude. We then applied one or both models to 34,046 chemicals expected to be in the environment, revealing several thousand chemicals of moderate concern and several hundred chemicals of high concern for health effects at estimated median population exposure levels. Further application can expand by orders of magnitude the coverage of organic chemicals that can be evaluated for their human health risks and impacts.
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Affiliation(s)
- Jacob Kvasnicka
- Department of Veterinary Physiology and Pharmacology, Interdisciplinary Faculty of Toxicology, Texas A&M University, College Station, Texas 77843, United States
| | - Nicolò Aurisano
- Quantitative Sustainability Assessment, Department of Environmental and Resource Engineering, Technical University of Denmark, Bygningstorvet 115, 2800 Kgs. Lyngby, Denmark
| | - Kerstin von Borries
- Quantitative Sustainability Assessment, Department of Environmental and Resource Engineering, Technical University of Denmark, Bygningstorvet 115, 2800 Kgs. Lyngby, Denmark
| | - En-Hsuan Lu
- Department of Veterinary Physiology and Pharmacology, Interdisciplinary Faculty of Toxicology, Texas A&M University, College Station, Texas 77843, United States
| | - Peter Fantke
- Quantitative Sustainability Assessment, Department of Environmental and Resource Engineering, Technical University of Denmark, Bygningstorvet 115, 2800 Kgs. Lyngby, Denmark
| | - Olivier Jolliet
- Quantitative Sustainability Assessment, Department of Environmental and Resource Engineering, Technical University of Denmark, Bygningstorvet 115, 2800 Kgs. Lyngby, Denmark
| | - Fred A Wright
- Departments of Statistics and Biological Sciences and Bioinformatics Research Center, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Weihsueh A Chiu
- Department of Veterinary Physiology and Pharmacology, Interdisciplinary Faculty of Toxicology, Texas A&M University, College Station, Texas 77843, United States
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Huang L, Aurisano N, Fantke P, Dissanayake A, Edirisinghe LGLM, Jolliet O. Near-field exposures and human health impacts for organic chemicals in interior paints: A high-throughput screening. JOURNAL OF HAZARDOUS MATERIALS 2024; 465:133145. [PMID: 38154180 DOI: 10.1016/j.jhazmat.2023.133145] [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: 09/06/2023] [Revised: 10/26/2023] [Accepted: 11/28/2023] [Indexed: 12/30/2023]
Abstract
Interior paints contain organic chemicals that might be harmful to painters and building residents. This study aims to develop a high-throughput approach to screen near-field human exposures and health impacts related to organic chemicals in interior paints. We developed mass balance models for both water- and solvent-based paints, predicting emissions during wet and dry phases. We then screened exposures and risks, focusing on Sri Lanka where residential houses are frequently repainted. These models accurately predict paint drying time and indoor air concentrations of organic chemicals. Exposures of both painter and household resident were estimated for 65 organic chemicals in water-based and 26 in solvent-based paints, considering 12 solvents. Chemicals of concerns (CoCs) were identified, and maximum acceptable chemical contents (MACs) were calculated. Water-based paints generally pose lower health risks than solvent-based paints but might contain biocides of high concern. The total human health impact of one painting event on all household adults ranges from 1.5 × 10-3 to 2.1 × 10-2 DALYs for solvent-based paints, and from 4.1 × 10-4 to 9.5 × 10-3 DALYs for water-based paints. The present approach is a promising way to support the formulation of safer paint, and is integrated in the USEtox scientific consensus model for use in life cycle assessment, chemical substitution and risk screening.
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Affiliation(s)
- Lei Huang
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI, USA
| | - Nicolò Aurisano
- Quantitative Sustainability Assessment, Department of Environmental and Resource Engineering, Technical University of Denmark, Bygningstorvet 115, 2800 Kgs. Lyngby, Denmark
| | - Peter Fantke
- Quantitative Sustainability Assessment, Department of Environmental and Resource Engineering, Technical University of Denmark, Bygningstorvet 115, 2800 Kgs. Lyngby, Denmark
| | | | | | - Olivier Jolliet
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI, USA; Quantitative Sustainability Assessment, Department of Environmental and Resource Engineering, Technical University of Denmark, Bygningstorvet 115, 2800 Kgs. Lyngby, Denmark.
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4
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Bisinella V, Schmidt S, Varling AS, Laner D, Christensen TH. Waste LCA and the future. WASTE MANAGEMENT (NEW YORK, N.Y.) 2024; 174:53-75. [PMID: 38016265 DOI: 10.1016/j.wasman.2023.11.021] [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: 07/20/2023] [Revised: 11/06/2023] [Accepted: 11/16/2023] [Indexed: 11/30/2023]
Abstract
Life cycle assessment (LCA) models quantifying the environmental aspects of waste management have become an integral part of waste management decision-making over the last two decades and have provided ample knowledge on both environmental benefits and drawbacks in the way we handle waste. Waste management and LCA modelling of waste management systems will soon be challenged by profound changes necessary in our societies and sectors to meet sustainable development goals. Foreseen changes in energy, material, and nutrient provision will directly and indirectly affect waste management in terms of its operation and goals. This study reflects on anticipated changes in society and industrial sectors and how these changes may affect waste management and LCA modelling of waste management systems in terms of waste input, the modelling of technologies and systems and exchanges of energy, materials, and nutrients, as well as how it may affect impact assessment and the interpretation of results. The study provides practical recommendations for LCA modelling of future waste management systems, which will hopefully lead to robust assessments that can support decision-making in an evolving society subject to great changes.
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Affiliation(s)
- V Bisinella
- Department of Environmental and Resource Engineering, Technical University of Denmark, Bygningstorvet 115, 2800 Kongens Lyngby, Denmark.
| | - S Schmidt
- Research Center for Resource Management and Solid Waste Engineering, Faculty of Civil and Environmental Engineering, University of Kassel, Mönchebergstraße 7, 34125 Kassel, Germany
| | - A S Varling
- Department of Environmental and Resource Engineering, Technical University of Denmark, Bygningstorvet 115, 2800 Kongens Lyngby, Denmark
| | - D Laner
- Research Center for Resource Management and Solid Waste Engineering, Faculty of Civil and Environmental Engineering, University of Kassel, Mönchebergstraße 7, 34125 Kassel, Germany
| | - T H Christensen
- Department of Environmental and Resource Engineering, Technical University of Denmark, Bygningstorvet 115, 2800 Kongens Lyngby, Denmark
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Knox KE, Dodson RE, Rudel RA, Polsky C, Schwarzman MR. Identifying Toxic Consumer Products: A Novel Data Set Reveals Air Emissions of Potent Carcinogens, Reproductive Toxicants, and Developmental Toxicants. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:7454-7465. [PMID: 37129244 DOI: 10.1021/acs.est.2c07247] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Consumer products are important sources of exposure to harmful chemicals. Product composition is often a mystery to users, however, due to gaps in the laws governing ingredient disclosure. A unique data set that the California Air Resources Board (CARB) uses to determine how volatile organic chemicals (VOCs) from consumer products affect smog formation holds a partial solution. By analyzing CARB data on VOCs in consumer products, we identified and quantified emissions of volatile chemicals regulated under the California Safe Drinking Water and Toxic Enforcement Act ("Prop 65"). We here highlight individual chemicals as well as consumer product categories that people are likely to be exposed to as individual consumers, in the workplace, and at the population level. Of the 33 Prop 65-listed chemicals that appear in the CARB emissions inventory, we classified 18 as "top tier priorities for elimination". Among these, methylene chloride and N-methyl-2-pyrrolidone were most prevalent in products across all three population groups. Of 172 consumer product categories, 105 contained Prop 65-listed chemicals. Although these chemicals are known carcinogens and reproductive/developmental toxicants, they remain in widespread use. Manufacturers and regulators should prioritize product categories containing Prop 65-listed chemicals for reformulation or redesign to reduce human exposures and associated health risks.
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Affiliation(s)
- Kristin E Knox
- Silent Spring Institute, Newton, Massachusetts 02460 United States
| | - Robin E Dodson
- Silent Spring Institute, Newton, Massachusetts 02460 United States
| | - Ruthann A Rudel
- Silent Spring Institute, Newton, Massachusetts 02460 United States
| | - Claudia Polsky
- School of Law, University of California, Berkeley, California 94720 United States
| | - Megan R Schwarzman
- School of Public Health, University of California, Berkeley, California 94720 United States
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6
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Aurisano N, Jolliet O, Chiu WA, Judson R, Jang S, Unnikrishnan A, Kosnik MB, Fantke P. Probabilistic Points of Departure and Reference Doses for Characterizing Human Noncancer and Developmental/Reproductive Effects for 10,145 Chemicals. ENVIRONMENTAL HEALTH PERSPECTIVES 2023; 131:37016. [PMID: 36989077 PMCID: PMC10056221 DOI: 10.1289/ehp11524] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 02/06/2023] [Accepted: 03/03/2023] [Indexed: 06/19/2023]
Abstract
BACKGROUND Regulatory toxicity values used to assess and manage chemical risks rely on the determination of the point of departure (POD) for a critical effect, which results from a comprehensive and systematic assessment of available toxicity studies. However, regulatory assessments are only available for a small fraction of chemicals. OBJECTIVES Using in vivo experimental animal data from the U.S. Environmental Protection Agency's Toxicity Value Database, we developed a semiautomated approach to determine surrogate oral route PODs, and corresponding toxicity values where regulatory assessments are unavailable. METHODS We developed a curated data set restricted to effect levels, exposure routes, study designs, and species relevant for deriving toxicity values. Effect levels were adjusted to chronic human equivalent benchmark doses (BMDh). We hypothesized that a quantile of the BMDh distribution could serve as a surrogate POD and determined the appropriate quantile by calibration to regulatory PODs. Finally, we characterized uncertainties around the surrogate PODs from intra- and interstudy variability and derived probabilistic toxicity values using a standardized workflow. RESULTS The BMDh distribution for each chemical was adequately fit by a lognormal distribution, and the 25th percentile best predicted the available regulatory PODs [R2≥0.78, residual standard error (RSE)≤0.53 log10 units]. We derived surrogate PODs for 10,145 chemicals from the curated data set, differentiating between general noncancer and reproductive/developmental effects, with typical uncertainties (at 95% confidence) of a factor of 10 and 12, respectively. From these PODs, probabilistic reference doses (1% incidence at 95% confidence), as well as human population effect doses (10% incidence), were derived. DISCUSSION In providing surrogate PODs calibrated to regulatory values and deriving corresponding toxicity values, we have substantially expanded the coverage of chemicals from 744 to 8,023 for general noncancer effects, and from 41 to 6,697 for reproductive/developmental effects. These results can be used across various risk assessment and risk management contexts, from hazardous site and life cycle impact assessments to chemical prioritization and substitution. https://doi.org/10.1289/EHP11524.
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Affiliation(s)
- Nicolò Aurisano
- Quantitative Sustainability Assessment, Department of Environmental and Resource Engineering, Technical University of Denmark, Lyngby, Denmark
| | - Olivier Jolliet
- Quantitative Sustainability Assessment, Department of Environmental and Resource Engineering, Technical University of Denmark, Lyngby, Denmark
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, Michigan, USA
| | - Weihsueh A. Chiu
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas, USA
| | - Richard Judson
- National Center for Computational Toxicology, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, USA
| | - Suji Jang
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas, USA
| | - Aswani Unnikrishnan
- National Center for Computational Toxicology, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, USA
| | - Marissa B. Kosnik
- Quantitative Sustainability Assessment, Department of Environmental and Resource Engineering, Technical University of Denmark, Lyngby, Denmark
| | - Peter Fantke
- Quantitative Sustainability Assessment, Department of Environmental and Resource Engineering, Technical University of Denmark, Lyngby, Denmark
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7
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Wambaugh JF, Rager JE. Exposure forecasting - ExpoCast - for data-poor chemicals in commerce and the environment. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2022; 32:783-793. [PMID: 36347934 PMCID: PMC9742338 DOI: 10.1038/s41370-022-00492-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 10/21/2022] [Accepted: 10/21/2022] [Indexed: 05/10/2023]
Abstract
Estimates of exposure are critical to prioritize and assess chemicals based on risk posed to public health and the environment. The U.S. Environmental Protection Agency (EPA) is responsible for regulating thousands of chemicals in commerce and the environment for which exposure data are limited. Since 2009 the EPA's ExpoCast ("Exposure Forecasting") project has sought to develop the data, tools, and evaluation approaches required to generate rapid and scientifically defensible exposure predictions for the full universe of existing and proposed commercial chemicals. This review article aims to summarize issues in exposure science that have been addressed through initiatives affiliated with ExpoCast. ExpoCast research has generally focused on chemical exposure as a statistical systems problem intended to inform thousands of chemicals. The project exists as a companion to EPA's ToxCast ("Toxicity Forecasting") project which has used in vitro high-throughput screening technologies to characterize potential hazard posed by thousands of chemicals for which there are limited toxicity data. Rapid prediction of chemical exposures and in vitro-in vivo extrapolation (IVIVE) of ToxCast data allow for prioritization based upon risk of adverse outcomes due to environmental chemical exposure. ExpoCast has developed (1) integrated modeling approaches to reliably predict exposure and IVIVE dose, (2) highly efficient screening tools for chemical prioritization, (3) efficient and affordable tools for generating new exposure and dose data, and (4) easily accessible exposure databases. The development of new exposure models and databases along with the application of technologies like non-targeted analysis and machine learning have transformed exposure science for data-poor chemicals. By developing high-throughput tools for chemical exposure analytics and translating those tools into public health decisions ExpoCast research has served as a crucible for identifying and addressing exposure science knowledge gaps.
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Affiliation(s)
- John F Wambaugh
- Center for Computational Toxicology and Exposure, Office of Research and Development, U.S. EPA, Research Triangle Park, NC, USA.
- Department of Environmental Sciences & Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
| | - Julia E Rager
- Department of Environmental Sciences & Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
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Lee H, Park J, Park K. Effects of consumer products chemicals ingredients and their mixtures on the estrogen receptor/androgen receptor transcriptional activation. CHEMOSPHERE 2022; 302:134866. [PMID: 35533928 DOI: 10.1016/j.chemosphere.2022.134866] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Revised: 04/12/2022] [Accepted: 05/04/2022] [Indexed: 05/09/2023]
Abstract
Unlike the environmental pollutants or industrial chemicals, the chemicals in consumer products may pose higher levels of risks, depending on how the chemicals are used in the products and how humans interact with the products. Recently, endocrine disrupting chemicals in cosmetics, personal care products, cleaners, sunscreens, and vinyl products were analytically quantified and many active chemicals including phthalates, parabens and bisphenols were detected. This indicates a wide range of exposures from common products. In this study, 35 chemicals known to be ingredients of consumer products were selected and screened for the transactivation of estrogen receptors and androgen receptors. From the results of individual chemicals, the activity of binary/ternary mixture prepared from the agonists for the ER transcription activity was measured, and compared to the predicted values obtained by the full logistic model. The measured and the predicted values were found to be very similar. This study may suggest that prediction of mixture activity by proper models would be one of the supportive tools for the risk assessment and sound regulation of chemical mixtures which have potential endocrine disrupting effects in consumer products.
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Affiliation(s)
- Handule Lee
- College of Pharmacy, Dongduk Women's University, Seoul, 02748, South Korea
| | - Juyoung Park
- College of Pharmacy, Dongduk Women's University, Seoul, 02748, South Korea
| | - Kwangsik Park
- College of Pharmacy, Dongduk Women's University, Seoul, 02748, South Korea.
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Bruinen de Bruin Y, Franco A, Ahrens A, Morris A, Verhagen H, Kephalopoulos S, Dulio V, Slobodnik J, Sijm DTHM, Vermeire T, Ito T, Takaki K, De Mello J, Bessems J, Zare Jeddi M, Tanarro Gozalo C, Pollard K, McCourt J, Fantke P. Enhancing the use of exposure science across EU chemical policies as part of the European Exposure Science Strategy 2020-2030. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2022; 32:513-525. [PMID: 34697409 PMCID: PMC9349036 DOI: 10.1038/s41370-021-00388-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 09/08/2021] [Accepted: 09/14/2021] [Indexed: 05/26/2023]
Abstract
BACKGROUND A scientific framework on exposure science will boost the multiuse of exposure knowledge across EU chemicals-related policies and improve risk assessment, risk management and communication across EU safety, security and sustainability domains. OBJECTIVE To stimulate public and private actors to align and strengthen the cross-policy adoption of exposure assessment data, methods and tools across EU legislation. METHODS By mapping and analysing the EU regulatory landscape making use of exposure information, policy and research challenges and key areas of action are identified and translated into opportunities enhancing policy and scientific efficiency. RESULTS Identified key areas of actions are to develop a common scientific exposure assessment framework, supported by baseline acceptance criteria and a shared knowledge base enhancing exchangeability and acceptability of exposure knowledge within and across EU chemicals-related policies. Furthermore, such framework will improve communication and management across EU chemical safety, security and sustainability policies comprising sourcing, manufacturing and global trade of goods and waste management. In support of building such a common framework and its effective use in policy and industry, exposure science innovation needs to be better embedded along the whole policymaking cycle, and be integrated into companies' safety and sustainability management systems. This will help to systemically improve regulatory risk management practices. SIGNIFICANCE This paper constitutes an important step towards the implementation of the EU Green Deal and its underlying policy strategies, such as the Chemicals Strategy for Sustainability.
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Affiliation(s)
- Yuri Bruinen de Bruin
- European Commission, Joint Research Centre, Directorate for Space, Security and Migration, Geel, Belgium.
- European Chemical Industry Council (Cefic), Brussels, Belgium.
| | - Antonio Franco
- European Commission, Joint Research Centre, Directorate on Health, Consumer and Reference Materials, Ispra, Italy
| | | | - Alick Morris
- European Commission, Directorate General Employment, Luxembourg, Luxembourg
| | - Hans Verhagen
- National Food Institute, Technical University of Denmark, Kgs. Lyngby, Denmark
- University of Ulster, Coleraine, Northern Ireland
| | - Stylianos Kephalopoulos
- European Commission, Joint Research Centre, Directorate on Health, Consumer and Reference Materials, Ispra, Italy
| | - Valeria Dulio
- INERIS - National Institute for Environment and Industrial Risks, Verneuil en Halatte, France
| | | | - Dick T H M Sijm
- Dutch Food and Consumer Product Safety Authority, Utrecht, The Netherlands
- University College Venlo, Campus Venlo, Maastricht University, Maastricht, The Netherlands
| | - Theo Vermeire
- RIVM - National Institute for Public Health and the Environment, Bilthoven, The Netherlands
| | - Takaaki Ito
- Organisation for Economic Co-operation and Development, Paris, France
| | - Koki Takaki
- Organisation for Economic Co-operation and Development, Paris, France
| | | | - Jos Bessems
- Flemish Institute for Technological Research, Mol, Belgium
| | - Maryam Zare Jeddi
- RIVM - National Institute for Public Health and the Environment, Bilthoven, The Netherlands
| | | | | | - Josephine McCourt
- European Commission, Joint Research Centre, Directorate for Space, Security and Migration, Geel, Belgium
| | - Peter Fantke
- Quantitative Sustainability Assessment, Department of Technology, Management and Economics, Technical University of Denmark, Kgs. Lyngby, Denmark
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10
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Grant KA, Nakayama Wong L, Meng Q, Lee H, Phelps D, Davis S, Salinas M, Luan T, Zhou X. Informed substitution of hazardous chemicals through the lens of California's Safer Consumer Products Alternatives Analysis: Best practices, challenges, and opportunities. INTEGRATED ENVIRONMENTAL ASSESSMENT AND MANAGEMENT 2022; 18:1007-1019. [PMID: 34590786 DOI: 10.1002/ieam.4527] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 09/26/2021] [Accepted: 09/28/2021] [Indexed: 06/13/2023]
Abstract
California adopted the Safer Consumer Products (SCP) regulations in 2013, which mandate that companies that manufacture specific products containing designated chemicals of concern complete an Alternatives Analysis. Alternatives Analysis is a process to avoid regrettable substitution by identifying, comparing, and selecting safer alternatives based on technical functions, hazards, exposure pathways, life-cycle multimedia impacts, and economic impacts. The SCP Alternatives Analysis builds upon and expands existing frameworks for alternatives assessments (AAs). The aim of this study was to identify practices from AA that facilitate the robust assessment of alternatives and that align with SCP requirements and identify gaps in the practice. We evaluated completed AAs for methods regarding transparency and careful documentation of information sources, data gaps, uncertainty, criteria, and justification for decision-making. The AAs in this review demonstrate some of the challenges in the field. Most AAs have a constrained scope and only consider chemical substitutes rather than a broad array of functional alternatives. Their scopes were also limited in the hazard endpoints that were evaluated. This was most noted with ecotoxicity endpoints, which were generally confined to aquatic toxicity. The majority of AAs do not explicitly explain their decision-making methods or adequately discuss tradeoffs across the adverse impacts. The AAs also lack the analysis in the exposure, life-cycle impacts, and economic impacts that are required in the SCP Alternatives Analysis process. Further, we recommend strategies and research opportunities to address these challenges and strengthen the practice of AAs. Integr Environ Assess Manag 2022;18:1007-1019. © 2021 SETAC.
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Affiliation(s)
- Kelly A Grant
- Safer Consumer Products program, Department of Toxic Substances Control, Sacramento, California, USA
| | - Lynn Nakayama Wong
- Safer Consumer Products program, Department of Toxic Substances Control, Sacramento, California, USA
| | - Qingyu Meng
- Safer Consumer Products program, Department of Toxic Substances Control, Sacramento, California, USA
| | - Heather Lee
- Safer Consumer Products program, Department of Toxic Substances Control, Sacramento, California, USA
| | - Diana Phelps
- Safer Consumer Products program, Department of Toxic Substances Control, Sacramento, California, USA
| | - Suzanne Davis
- Safer Consumer Products program, Department of Toxic Substances Control, Sacramento, California, USA
| | - Melissa Salinas
- Safer Consumer Products program, Department of Toxic Substances Control, Sacramento, California, USA
| | - Tony Luan
- Safer Consumer Products program, Department of Toxic Substances Control, Sacramento, California, USA
| | - Xiaoying Zhou
- Safer Consumer Products program, Department of Toxic Substances Control, Sacramento, California, USA
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11
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Huang L, Fantke P, Ritscher A, Jolliet O. Chemicals of concern in building materials: A high-throughput screening. JOURNAL OF HAZARDOUS MATERIALS 2022; 424:127574. [PMID: 34799153 DOI: 10.1016/j.jhazmat.2021.127574] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 10/05/2021] [Accepted: 10/19/2021] [Indexed: 05/24/2023]
Abstract
Chemicals used in building materials can be a major passive emission source indoors, associated with the deterioration of indoor environmental quality. This study aims to screen the various chemicals used in building materials for potential near-field human exposures and related health risks, identifying chemicals and products of concern to inform risk reduction efforts. We propose a mass balance-based and high-throughput suited model for predicting chemical emissions from building materials considering indoor sorption. Using this model, we performed a screening-level human exposure assessment for chemicals in building materials, starting from product chemical composition data reported in the Pharos Building Products Database for the USA. Health risks and MAximum chemical Contents from High-Throughput Screening (MACHTS) were determined, combining exposure estimates with toxicity information. Exposures were estimated for > 300 unique chemical-product combinations from the Pharos databases, of which 73% (25%) had non-cancer (cancer) toxicity data available. We identified 55 substances as chemicals of high concern, with actual chemical contents exceeding MACHTS by up to a factor 105, in particular diisocyanates and formaldehyde. This stresses the need for more refined investigations to select safer alternatives. This study serves as a suitable starting point for prioritizing chemicals/products and thus developing safer and more sustainable building materials.
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Affiliation(s)
- Lei Huang
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI, USA
| | - Peter Fantke
- Quantitative Sustainability Assessment, Department of Technology, Management and Economics, Technical University of Denmark, Produktionstorvet 424, 2800 Kgs. Lyngby, Denmark
| | - Amélie Ritscher
- Individual Contractor, Economy Division, United Nations Environment Programme, 8-14 Avenue de la Paix, CH-1211 Geneva 10, Switzerland
| | - Olivier Jolliet
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI, USA; Quantitative Sustainability Assessment, Department of Technology, Management and Economics, Technical University of Denmark, Produktionstorvet 424, 2800 Kgs. Lyngby, Denmark.
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12
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Yeoman AM, Heeley-Hill AC, Shaw M, Andrews SJ, Lewis AC. Inhalation of VOCs from facial moisturizers and the influence of dose proximity. INDOOR AIR 2022; 32:e12948. [PMID: 34816489 DOI: 10.1111/ina.12948] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 10/08/2021] [Accepted: 10/13/2021] [Indexed: 06/13/2023]
Abstract
Volatile organic compound (VOC) emissions from personal care products (PCPs) contribute to poor indoor air quality. Exposure to indoor VOCs is typically determined through ambient concentration measurements; however, for some PCPs the proximity of use to the nose and mouth may lead to disproportionately large inhaled doses. In this paper, we quantify emission factors for six common PCP ingredient VOCs (ethanol, 2-propanol, benzyl alcohol, 1,3-butanediol, t-butyl alcohol, and the grouping of monoterpenes as limonene) from 16 facial day-moisturizers using headspace analysis and selected ion flow-tube mass spectrometry. A wide range of emissions rates were observed across the range of products tested (e.g., ethanol 3.3-6.9 × 102 µg s-1 g[product]-1 , limonene 1.3 × 10-1 -4.1 × 10-1 µg s-1 g[product]-1 ). We use a mannequin head with reconstructed nose and mouth airways to sample VOCs from facial application at typical respiration volumes. A single facial application of moisturizer can lead to a much larger inhaled VOC dose than would be inhaled from typical indoor ambient air over 24 h (e.g., limonene up to ~×16 greater via facial application, ethanol up to ~×300). Emissions from facially applied PCPs typically decayed to background concentrations over periods ranging from 5 to 150 min.
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Affiliation(s)
- Amber M Yeoman
- Wolfson Atmospheric Chemistry Laboratories, University of York, York, UK
| | | | - Marvin Shaw
- National Centre for Atmospheric Science, University of York, York, UK
| | - Stephen J Andrews
- National Centre for Atmospheric Science, University of York, York, UK
| | - Alastair C Lewis
- National Centre for Atmospheric Science, University of York, York, UK
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13
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Aurisano N, Fantke P, Huang L, Jolliet O. Estimating mouthing exposure to chemicals in children's products. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2022; 32:94-102. [PMID: 34188178 PMCID: PMC8770116 DOI: 10.1038/s41370-021-00354-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 06/09/2021] [Accepted: 06/09/2021] [Indexed: 05/16/2023]
Abstract
BACKGROUND Existing models for estimating children's exposure to chemicals through mouthing currently depends on the availability of chemical- and material-specific experimental migration rates, only covering a few dozen chemicals. OBJECTIVE This study objective is hence to develop a mouthing exposure model to predict migration into saliva, mouthing exposure, and related health risk from a wide range of chemical-material combinations in children's products. METHODS We collected experimental data on chemical migration from different products into saliva for multiple substance groups and materials, identifying chemical concentration and diffusion coefficient as main properties of influence. To predict migration rates into saliva, we adapted a previously developed migration model for chemicals in food packaging materials. We also developed a regression model based on identified chemical and material properties. RESULTS Our migration predictions correlate well with experimental data (R2 = 0.85) and vary widely from 8 × 10-7 to 32.7 µg/10 cm2/min, with plasticizers in PVC showing the highest values. Related mouthing exposure doses vary across chemicals and materials from a median of 0.005 to 253 µg/kgBW/d. Finally, we combined exposure estimates with toxicity information to yield hazard quotients and identify chemicals of concern for average and upper bound mouthing behavior scenarios. SIGNIFICANCE The proposed model can be applied for predicting migration rates for hundreds of chemical-material combinations to support high-throughput screening.
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Affiliation(s)
- Nicolò Aurisano
- Quantitative Sustainability Assessment, Department of Technology, Management and Economics, Technical University of Denmark, Produktionstorvet 424, 2800, Kgs. Lyngby, Denmark
| | - Peter Fantke
- Quantitative Sustainability Assessment, Department of Technology, Management and Economics, Technical University of Denmark, Produktionstorvet 424, 2800, Kgs. Lyngby, Denmark.
| | - Lei Huang
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, 1415 Washington Heights, Ann Arbor, MI, 48109, USA
| | - Olivier Jolliet
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, 1415 Washington Heights, Ann Arbor, MI, 48109, USA
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Park J, Lee H, Park K. Gastrointestinal tract and skin permeability of chemicals in consumer products using parallel artificial membrane permeability assay (PAMPA). Environ Anal Health Toxicol 2021; 36:e2021021-0. [PMID: 34583463 PMCID: PMC8598401 DOI: 10.5620/eaht.2021021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 08/12/2021] [Indexed: 12/23/2022] Open
Abstract
Some chemicals commonly used in personal care products, household items, food vessels, cosmetics, and other consumer products are potentially harmful, and several reviews of epidemiological studies have suggested the associations between the chemical exposure from consumer products, and respiratory diseases, skin sensitization, and reproductive problems. Therefore, risk assessment is essential for management of consumer products safety. Necessarily, the estimation of human exposure is an essential step in risk assessment, and the absorption rate of those chemicals via the gastrointestinal tract, respiratory tract, and skin are very critical in determining the internal dose of the exposed chemicals. In this study, parallel artificial membrane permeability assays (PAMPA) for the gastrointestinal tract and skin were performed to evaluate the permeability of parabens (4-hydroxybenzoic acid, methyl-, propyl-, and butyl paraben), bisphenols (bisphenol A, bisphenol F, and bisphenol S), isothiazolinones (methyl-, chloromethyl-, benz-, octyl-, and dichlorooctyl isothiazolinone), and phthalates [diethyl-, dibutyl-, Di-isononyl-, and bis(2-ethylhexyl) phthalate]. Lipid solubility of test chemicals indicated by log P values was shown as the most critical factor and showed a positive association with the permeability of parabens, bisphenols, and isothiazolinones in PAMPA assay. However, phthalate showed a reverse-association between lipophilicity and permeability. The permeability of all the tested chemicals was higher in the gastrointestinal tract membrane than in the skin membrane. The pH in donor solution did not show significant effects on the permeability in all the chemicals, except the chemicals with a free hydrophilic moiety in their chemical structures.
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Affiliation(s)
- Juyoung Park
- College of Pharmacy, Dongduk Women's University, Seoul 02748, Korea
| | - Handule Lee
- College of Pharmacy, Dongduk Women's University, Seoul 02748, Korea
| | - Kwangsik Park
- College of Pharmacy, Dongduk Women's University, Seoul 02748, Korea
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Burns EE, Csiszar SA, Roush KS, Davies IA. National scale down-the-drain environmental risk assessment of oxybenzone in the United States. INTEGRATED ENVIRONMENTAL ASSESSMENT AND MANAGEMENT 2021; 17:951-960. [PMID: 33913597 PMCID: PMC8453704 DOI: 10.1002/ieam.4430] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 02/22/2021] [Accepted: 04/15/2021] [Indexed: 05/05/2023]
Abstract
Organic ultraviolet (UV) filters are used in cosmetic and personal care products (CPCPs) and over-the-counter (OTC) sunscreens, due to their ability to absorb solar radiation. When OTC and CPCP ingredients are washed down the drain, they can then enter freshwaters that receive wastewater treatment plant effluents. This paper presents a freshwater environmental safety assessment of a key UV filter, oxybenzone, used in OTC sunscreens and CPCPs in the United States. Exposure was characterized using iSTREEM® , a spatially resolved aquatic exposure model developed for chemicals disposed of down the drain. iSTREEM® provides a comprehensive exposure assessment of oxybenzone concentrations in United States receiving waters through predicted environmental concentration (PEC) distributions representative of conditions across the region. A review of available hazard data was used to derive a predicted no-effect concentration (PNEC) using aquatic toxicity data and assessment factors. A safety assessment was conducted by comparing the PEC distribution with the PNEC. The results indicate that oxybenzone is of low concern and there is a significant margin of safety as the 90th percentile PEC is two orders of magnitude below the PNEC. These results are instrumental in demonstrating the environmental safety of key organic UV filters in the U.S. freshwater environment and will help prioritize future work. Integr Environ Assess Manag 2021;17:951-960. © 2021 Personal Care Products Council. Integrated Environmental Assessment and Management published by Wiley Periodicals LLC on behalf of Society of Environmental Toxicology & Chemistry (SETAC).
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Affiliation(s)
- Emily E. Burns
- Personal Care Products CouncilWashingtonDistrict of ColumbiaUSA
| | | | | | - Iain A. Davies
- Personal Care Products CouncilWashingtonDistrict of ColumbiaUSA
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Fantke P, Chiu WA, Aylward L, Judson R, Huang L, Jang S, Gouin T, Rhomberg L, Aurisano N, McKone T, Jolliet O. Exposure and Toxicity Characterization of Chemical Emissions and Chemicals in Products: Global Recommendations and Implementation in USEtox. THE INTERNATIONAL JOURNAL OF LIFE CYCLE ASSESSMENT 2021; 26:899-915. [PMID: 34140756 PMCID: PMC8208704 DOI: 10.1007/s11367-021-01889-y] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Accepted: 03/11/2021] [Indexed: 05/24/2023]
Abstract
PURPOSE Reducing chemical pressure on human and environmental health is an integral part of the global sustainability agenda. Guidelines for deriving globally applicable, life cycle based indicators are required to consistently quantify toxicity impacts from chemical emissions as well as from chemicals in consumer products. In response, we elaborate the methodological framework and present recommendations for advancing near-field/far-field exposure and toxicity characterization, and for implementing these recommendations in the scientific consensus model USEtox. METHODS An expert taskforce was convened by the Life Cycle Initiative hosted by UN Environment to expand existing guidance for evaluating human toxicity impacts from exposure to chemical substances. This taskforce evaluated advances since the original release of USEtox. Based on these advances, the taskforce identified two major aspects that required refinement, namely integrating near-field and far-field exposure and improving human dose-response modeling. Dedicated efforts have led to a set of recommendations to address these aspects in an update of USEtox, while ensuring consistency with the boundary conditions for characterizing life cycle toxicity impacts and being aligned with recommendations from agencies that regulate chemical exposure. The proposed framework was finally tested in an illustrative rice production and consumption case study. RESULTS AND DISCUSSION On the exposure side, a matrix system is proposed and recommended to integrate far-field exposure from environmental emissions with near-field exposure from chemicals in various consumer product types. Consumer exposure is addressed via submodels for each product type to account for product characteristics and exposure settings. Case study results illustrate that product-use related exposure dominates overall life cycle exposure. On the effect side, a probabilistic dose-response approach combined with a decision tree for identifying reliable points of departure is proposed for non-cancer effects, following recent guidance from the World Health Organization. This approach allows for explicitly considering both uncertainty and human variability in effect factors. Factors reflecting disease severity are proposed to distinguish cancer from non-cancer effects, and within the latter discriminate reproductive/developmental and other non-cancer effects. All proposed aspects have been consistently implemented into the original USEtox framework. CONCLUSIONS The recommended methodological advancements address several key limitations in earlier approaches. Next steps are to test the new characterization framework in additional case studies and to close remaining research gaps. Our framework is applicable for evaluating chemical emissions and product-related exposure in life cycle assessment, chemical alternatives assessment and chemical substitution, consumer exposure and risk screening, and high-throughput chemical prioritization.
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Affiliation(s)
- Peter Fantke
- Quantitative Sustainability Assessment, Department of Technology, Management and Economics, Technical University of Denmark, Produktionstorvet 424, 2800 Kgs. Lyngby, Denmark
| | - Weihsueh A. Chiu
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas, USA
| | - Lesa Aylward
- Queensland Alliance for Environmental Health Sciences, University of Queensland, Brisbane, Australia
| | - Richard Judson
- National Center for Computational Toxicology, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711, USA
| | - Lei Huang
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Suji Jang
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas, USA
| | - Todd Gouin
- TG Environmental Research, Sharnbrook, MK44 1PL, UK
| | | | - Nicolò Aurisano
- Quantitative Sustainability Assessment, Department of Technology, Management and Economics, Technical University of Denmark, Produktionstorvet 424, 2800 Kgs. Lyngby, Denmark
| | - Thomas McKone
- School of Public Health, University of California, Berkeley, California 94720, USA
| | - Olivier Jolliet
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, Michigan 48109, USA
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Jolliet O, Huang L, Hou P, Fantke P. High Throughput Risk and Impact Screening of Chemicals in Consumer Products. RISK ANALYSIS : AN OFFICIAL PUBLICATION OF THE SOCIETY FOR RISK ANALYSIS 2021; 41:627-644. [PMID: 33073419 PMCID: PMC8246852 DOI: 10.1111/risa.13604] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Revised: 06/13/2020] [Accepted: 08/25/2020] [Indexed: 05/20/2023]
Abstract
The ubiquitous presence of more than 80,000 chemicals in thousands of consumer products used on a daily basis stresses the need for screening a broader set of chemicals than the traditional well-studied suspect chemicals. This high-throughput screening combines stochastic chemical-product usage with mass balance-based exposure models and toxicity data to prioritize risks associated with household products. We first characterize product usage using the stochastic SHEDS-HT model and chemical content in common household products from the CPDat database, the chemical amounts applied daily varying over more than six orders of magnitude, from mg to kg. We then estimate multi-pathways near- and far-field exposures for 5,500 chemical-product combinations, applying an extended USEtox model to calculate product intake fractions ranging from 0.001 to ∼1, and exposure doses varying over more than nine orders of magnitude. Combining exposure doses with chemical-specific dose-responses and reference doses shows that risks can be substantial for multiple home maintenance products, such as paints or paint strippers, for some home-applied pesticides, leave-on personal care products, and cleaning products. Sixty percent of the chemical-product combinations have hazard quotients exceeding 1, and 9% of the combinations have lifetime cancer risks exceeding 10-4 . Population-level impacts of household products ingredients can be substantial, representing 5 to 100 minutes of healthy life lost per day, with users' exposures up to 103 minutes per day. To address this issue, present mass balance-based models are already able to provide exposure estimates for both users and populations. This screening study shows large variations of up to 10 orders of magnitude in impact across both chemicals and product combinations, demonstrating that prioritization based on hazard only is not acceptable, since it would neglect orders of magnitude variations in both product usage and exposure that need to be quantified. To address this, the USEtox suite of mass balance-based models is already able to provide exposure estimates for thousands of product-chemical combinations for both users and populations. The present study calls for more scrutiny of most impacting chemical-product combinations, fully ensuring from a regulatory perspective consumer product safety for high-end users and using protective measures for users.
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Affiliation(s)
- Olivier Jolliet
- Environmental Health Sciences, School of Public HealthUniversity of MichiganAnn ArborMIUSA
| | - Lei Huang
- Environmental Health Sciences, School of Public HealthUniversity of MichiganAnn ArborMIUSA
| | - Ping Hou
- School for Environment and SustainabilityUniversity of MichiganAnn ArborMIUSA
| | - Peter Fantke
- Quantitative Sustainability Assessment, Department of Technology, Management and EconomicsTechnical University of Denmark2800 KgsLyngbyDenmark
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Sy MM, Garcia-Hidalgo E, Jung C, Lindtner O, von Goetz N, Greiner M. Analysis of consumer behavior for the estimation of the exposure to chemicals in personal care products. Food Chem Toxicol 2020; 140:111320. [PMID: 32302718 DOI: 10.1016/j.fct.2020.111320] [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: 09/06/2019] [Revised: 04/01/2020] [Accepted: 04/02/2020] [Indexed: 02/06/2023]
Abstract
In this study, the main objective was to implement an integrative modelling framework in order to support the prioritization and screening of chemicals present in personal care products (PCPs) regarding their potential to expose users across multiple possible pathways. Here, we implemented an exposure-based framework based on product intake fractions (PiFs) calculated using a two-compartment model reproducing the skin uptake and the competing volatilization of chemicals applied on skin during PCP use. The implemented framework enabled to simultaneously and comprehensively accommodate coupled chemical specific parameters (i.e. physical and chemical properties of the candidate chemicals), exposure information specific for product-chemical combinations, and survey data informing on consumer behavior. A case-study, based on the usage pattern data of 22 PCPs investigated among Swiss individuals (Garcia-Hidalgo et al., 2017a) and 113 candidate chemicals chosen for their suspected presence in the PCP categories of interest was defined to evaluate the applicability of the framework. Nonnegative matrix factorization (NMF) and hierarchical clustering were subsequently applied to identify chemicals with the highest exposure potential and to highlight most relevant mixtures of chemicals on the basis of the specific usage patterns of the considered survey individuals.
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Affiliation(s)
- Mouhamadou M Sy
- German Federal Institute for Risk Assessment (BfR), Exposure Department, Max-Dohrn Str. 8-10, 10589, Berlin, Germany.
| | | | - Christian Jung
- German Federal Institute for Risk Assessment (BfR), Exposure Department, Max-Dohrn Str. 8-10, 10589, Berlin, Germany
| | - Oliver Lindtner
- German Federal Institute for Risk Assessment (BfR), Exposure Department, Max-Dohrn Str. 8-10, 10589, Berlin, Germany
| | - Natalie von Goetz
- Swiss Federal Institute of Technology (ETH) Zurich, 8093, Zurich, Switzerland
| | - Matthias Greiner
- German Federal Institute for Risk Assessment (BfR), Exposure Department, Max-Dohrn Str. 8-10, 10589, Berlin, Germany
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Greggs W, Burns T, Egeghy P, Embry MR, Fantke P, Gaborek B, Heine L, Jolliet O, Lee C, Muir D, Plotzke K, Rinkevich J, Sunger N, Tanir JY, Whittaker M. Qualitative approach to comparative exposure in alternatives assessment. INTEGRATED ENVIRONMENTAL ASSESSMENT AND MANAGEMENT 2019; 15:880-894. [PMID: 29917303 PMCID: PMC6899567 DOI: 10.1002/ieam.4070] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 03/13/2018] [Accepted: 06/08/2018] [Indexed: 05/29/2023]
Abstract
Most alternatives assessments (AAs) published to date are largely hazard-based rankings, thereby ignoring potential differences in human and/or ecosystem exposures; as such, they may not represent a fully informed consideration of the advantages and disadvantages of possible alternatives. Building on the 2014 US National Academy of Sciences recommendations to improve AA decisions by including comparative exposure assessment into AAs, the Health and Environmental Sciences Institute's (HESI) Sustainable Chemical Alternatives Technical Committee, which comprises scientists from academia, industry, government, and nonprofit organizations, developed a qualitative comparative exposure approach. Conducting such a comparison can screen for alternatives that are expected to have a higher or different routes of human or environmental exposure potential, which together with consideration of the hazard assessment, could trigger a higher tiered, more quantitative exposure assessment on the alternatives being considered, minimizing the likelihood of regrettable substitution. This article outlines an approach for including chemical ingredient- and product-related exposure information in a qualitative comparison, including ingredient and product-related parameters. A classification approach was developed for ingredient and product parameters to support comparisons between alternatives as well as a methodology to address exposure parameter relevance and data quality. The ingredient parameters include a range of physicochemical properties that can impact routes and magnitude of exposure, whereas the product parameters include aspects such as product-specific exposure pathways, use information, accessibility, and disposal. Two case studies are used to demonstrate the application of the methodology. Key learnings and future research needs are summarized. Integr Environ Assess Manag 2018;00:000-000. © 2018 The Authors. Integrated Environmental Assessment and Management published by Wiley Periodicals, Inc. on behalf of Society of Environmental Toxicology & Chemistry (SETAC).
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Affiliation(s)
| | - Thomas Burns
- Novozymes, Research Triangle ParkNorth CarolinaUSA
| | - Peter Egeghy
- US Environmental Protection AgencyDurhamNorth Carolina
| | | | - Peter Fantke
- Technical University of DenmarkKongens LyngbyDenmark
| | - Bonnie Gaborek
- DuPont Haskell Global Centers for Health and Environmental SciencesNewarkDelawareUSA
| | | | | | - Carolyn Lee
- ExxonMobil Biomedical SciencesAnnandaleNew JerseyUSA
| | - Derek Muir
- Environment and Climate Change CanadaBurlingtonOntario
| | | | | | - Neha Sunger
- West Chester UniversityWest ChesterPennsylvaniaUSA
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Huang L, Anastas N, Egeghy P, Vallero DA, Jolliet O, Bare J. Integrating exposure to chemicals in building materials during use stage. THE INTERNATIONAL JOURNAL OF LIFE CYCLE ASSESSMENT 2019; 24:1009-1026. [PMID: 32632341 PMCID: PMC7336532 DOI: 10.1007/s11367-018-1551-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
PURPOSE There do not currently exist scientifically defensible ways to consistently characterize the human exposures (via various pathways) to near-field chemical emissions and associated health impacts during the use stage of building materials. The present paper thus intends to provide a roadmap which summarizes the current status and guides future development for integrating into LCA the chemical exposures and health impacts on various users of building materials, with a focus on building occupants. METHODS We first review potential human health impacts associated with the substances in building materials and the methods used to mitigate these impacts, also identifying several of the most important online data resources. A brief overview of the necessary steps for characterizing use stage chemical exposures and health impacts for building materials is then provided. Finally, we propose a systematic approach to integrate the use stage exposures and health impacts into building material LCA and describe its components, and then present a case study illustrating the application of the proposed approach to two representative chemicals: formaldehyde and methylene diphenyl diisocyanate (MDI) in particleboard products. RESULTS AND DISCUSSION Our proposed approach builds on the coupled near-field and far-field framework proposed by Fantke et al. (Environ Int 94:508-518, 2016), which is based on the product intake fraction (PiF) metric proposed by Jolliet et al. (Environ Sci Technol 49:8924-8931, 2015), The proposed approach consists of three major components: characterization of product usage and chemical content, human exposures, and toxicity, for which available methods and data sources are reviewed and research gaps are identified. The case study illustrates the difference in dominant exposure pathways between formaldehyde and MDI and also highlights the impact of timing and use duration (e.g., the initial 50 days of the use stage vs. the remaining 15 years) on the exposures and health impacts for the building occupants. CONCLUSIONS The proposed approach thus provides the methodological basis for integrating into LCA the human health impacts associated with chemical exposures during the use stage of building materials. Data and modeling gaps which currently prohibit the application of the proposed systematic approach are discussed, including the need for chemical composition data, exposure models, and toxicity data. Research areas that are not currently focused on are also discussed, such as worker exposures and complex materials. Finally, future directions for integrating the use stage impacts of building materials into decision making in a tiered approach are discussed.
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Affiliation(s)
- Lei Huang
- School of Public Health, Department of Environmental Health Sciences, University of Michigan, 1415 Washington Heights, Ann Arbor, MI, 48109, USA
| | - Nicholas Anastas
- National Risk Management Research Laboratory, US EPA Office of Research and Development, 5 Post Office Square, Boston, MA, 02109, USA
| | - Peter Egeghy
- National Exposure Research Laboratory, US EPA Office of Research and Development, Research Triangle Park, NC, 27711, USA
| | - Daniel A Vallero
- National Exposure Research Laboratory, US EPA Office of Research and Development, Research Triangle Park, NC, 27711, USA
| | - Olivier Jolliet
- School of Public Health, Department of Environmental Health Sciences, University of Michigan, 1415 Washington Heights, Ann Arbor, MI, 48109, USA
| | - Jane Bare
- National Risk Management Research Laboratory, US EPA, Office of Research and Development, 26 West MLK Dr, Cincinnati, OH, 45268, USA
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Li D, Suh S. Health risks of chemicals in consumer products: A review. ENVIRONMENT INTERNATIONAL 2019; 123:580-587. [PMID: 30622082 DOI: 10.1016/j.envint.2018.12.033] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Revised: 11/01/2018] [Accepted: 12/15/2018] [Indexed: 06/09/2023]
Abstract
Increasingly diverse chemicals are used in consumer products, while our understanding of their exposure pathways and associated human health risks still lags behind. This paper aims to identify the dominant patterns of exposure pathways and associated health risks of chemicals used in consumer products reported in the peer-reviewed literature. We analyzed 342 articles covering 202 unique chemicals, and distilled the information on the functional uses, product applications, exposure routes, exposure pathways, toxicity endpoints and their combinations. We found that the volume of the literature addressing human health risks of chemicals in consumer products is increasing. Among others, phthalates, bisphenol-A, and polybrominated diphenyl ethers were the most frequently discussed chemical groups in the literature reviewed. Emerged from our review were a number of frequently reported functional use/product application combinations, including plasticizers, polymers/monomers, and flame retardants used in food contact products, personal care products, cosmetics, furniture, flooring, and electronics. We also observed a strong tendency that the number of publications on a chemical surges following major regulatory changes or exposure incidents associated with the chemical. We highlight the need to develop the capacity and the mechanism through which human health risks of chemicals in consumer products can be identified prior to their releases.
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Affiliation(s)
- Dingsheng Li
- Bren School of Environmental Science & Management, University of California Santa Barbara, Santa Barbara, CA, United States; School of Community Health Sciences, University of Nevada, Reno, NV, United States
| | - Sangwon Suh
- Bren School of Environmental Science & Management, University of California Santa Barbara, Santa Barbara, CA, United States.
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Ring CL, Arnot JA, Bennett DH, Egeghy PP, Fantke P, Huang L, Isaacs KK, Jolliet O, Phillips KA, Price PS, Shin HM, Westgate JN, Setzer RW, Wambaugh JF. Consensus Modeling of Median Chemical Intake for the U.S. Population Based on Predictions of Exposure Pathways. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:719-732. [PMID: 30516957 PMCID: PMC6690061 DOI: 10.1021/acs.est.8b04056] [Citation(s) in RCA: 76] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Prioritizing the potential risk posed to human health by chemicals requires tools that can estimate exposure from limited information. In this study, chemical structure and physicochemical properties were used to predict the probability that a chemical might be associated with any of four exposure pathways leading from sources-consumer (near-field), dietary, far-field industrial, and far-field pesticide-to the general population. The balanced accuracies of these source-based exposure pathway models range from 73 to 81%, with the error rate for identifying positive chemicals ranging from 17 to 36%. We then used exposure pathways to organize predictions from 13 different exposure models as well as other predictors of human intake rates. We created a consensus, meta-model using the Systematic Empirical Evaluation of Models framework in which the predictors of exposure were combined by pathway and weighted according to predictive ability for chemical intake rates inferred from human biomonitoring data for 114 chemicals. The consensus model yields an R2 of ∼0.8. We extrapolate to predict relevant pathway(s), median intake rate, and credible interval for 479 926 chemicals, mostly with minimal exposure information. This approach identifies 1880 chemicals for which the median population intake rates may exceed 0.1 mg/kg bodyweight/day, while there is 95% confidence that the median intake rate is below 1 μg/kg BW/day for 474572 compounds.
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Affiliation(s)
- Caroline L. Ring
- National Center for Computational Toxicology, Office of Research and Development, United States Environmental Protection Agency, Research Triangle Park, North Carolina 27711
- Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee 37831
| | - Jon A. Arnot
- ARC Arnot Research and Consulting, 36 Sproat Ave. Toronto, ON, Canada, M4M 1W4
- Department of Physical & Environmental Sciences, University of Toronto Scarborough 1265 Military Trail, Toronto, ON, Canada, M1C 1A4
- Department of Pharmacology and Toxicology, University of Toronto, 1 King’s College Cir, Toronto, ON, Canada, M5S 1A8
| | - Deborah H. Bennett
- Department of Public Health Sciences, University of California, Davis, California, 95616
| | - Peter P. Egeghy
- National Exposure Research Laboratory, Office of Research and Development, United States Environmental Protection Agency, Research Triangle Park, North Carolina 27711
| | - Peter Fantke
- Quantitative Sustainability Assessment Division, Department of Management Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Lei Huang
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, Michigan 48109
| | - Kristin K. Isaacs
- National Exposure Research Laboratory, Office of Research and Development, United States Environmental Protection Agency, Research Triangle Park, North Carolina 27711
| | - Olivier Jolliet
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, Michigan 48109
| | - Katherine A. Phillips
- National Exposure Research Laboratory, Office of Research and Development, United States Environmental Protection Agency, Research Triangle Park, North Carolina 27711
| | - Paul S. Price
- National Exposure Research Laboratory, Office of Research and Development, United States Environmental Protection Agency, Research Triangle Park, North Carolina 27711
| | - Hyeong-Moo Shin
- Department of Earth and Environmental Sciences, University of Texas, Arlington, Texas, 76019
| | - John N. Westgate
- ARC Arnot Research and Consulting, 36 Sproat Ave. Toronto, ON, Canada, M4M 1W4
| | - R. Woodrow Setzer
- National Center for Computational Toxicology, Office of Research and Development, United States Environmental Protection Agency, Research Triangle Park, North Carolina 27711
| | - John F. Wambaugh
- National Center for Computational Toxicology, Office of Research and Development, United States Environmental Protection Agency, Research Triangle Park, North Carolina 27711
- Corresponding Author: John F. Wambaugh, 109 T.W. Alexander Dr, NC 27711, USA, , Phone: (919) 541-7641
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Fantke P, Aylward L, Bare J, Chiu WA, Dodson R, Dwyer R, Ernstoff A, Howard B, Jantunen M, Jolliet O, Judson R, Kirchhübel N, Li D, Miller A, Paoli G, Price P, Rhomberg L, Shen B, Shin HM, Teeguarden J, Vallero D, Wambaugh J, Wetmore BA, Zaleski R, McKone TE. Advancements in Life Cycle Human Exposure and Toxicity Characterization. ENVIRONMENTAL HEALTH PERSPECTIVES 2018; 126:125001. [PMID: 30540492 PMCID: PMC6371687 DOI: 10.1289/ehp3871] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 11/06/2018] [Accepted: 11/15/2018] [Indexed: 05/06/2023]
Abstract
BACKGROUND The Life Cycle Initiative, hosted at the United Nations Environment Programme, selected human toxicity impacts from exposure to chemical substances as an impact category that requires global guidance to overcome current assessment challenges. The initiative leadership established the Human Toxicity Task Force to develop guidance on assessing human exposure and toxicity impacts. Based on input gathered at three workshops addressing the main current scientific challenges and questions, the task force built a roadmap for advancing human toxicity characterization, primarily for use in life cycle impact assessment (LCIA). OBJECTIVES The present paper aims at reporting on the outcomes of the task force workshops along with interpretation of how these outcomes will impact the practice and reliability of toxicity characterization. The task force thereby focuses on two major issues that emerged from the workshops, namely considering near-field exposures and improving dose–response modeling. DISCUSSION The task force recommended approaches to improve the assessment of human exposure, including capturing missing exposure settings and human receptor pathways by coupling additional fate and exposure processes in consumer and occupational environments (near field) with existing processes in outdoor environments (far field). To quantify overall aggregate exposure, the task force suggested that environments be coupled using a consistent set of quantified chemical mass fractions transferred among environmental compartments. With respect to dose–response, the task force was concerned about the way LCIA currently characterizes human toxicity effects, and discussed several potential solutions. A specific concern is the use of a (linear) dose–response extrapolation to zero. Another concern addresses the challenge of identifying a metric for human toxicity impacts that is aligned with the spatiotemporal resolution of present LCIA methodology, yet is adequate to indicate health impact potential. CONCLUSIONS Further research efforts are required based on our proposed set of recommendations for improving the characterization of human exposure and toxicity impacts in LCIA and other comparative assessment frameworks. https://doi.org/10.1289/EHP3871.
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Affiliation(s)
- Peter Fantke
- Quantitative Sustainability Assessment Division, Department of Management Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - Lesa Aylward
- National Centre for Environmental Toxicology, University of Queensland, Brisbane, Australia
| | - Jane Bare
- U.S. EPA (Environmental Protection Agency), Cincinnati, Ohio, USA
| | - Weihsueh A Chiu
- Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, Texas, USA
| | - Robin Dodson
- Silent Spring Institute, Newton, Massachusetts, USA
| | - Robert Dwyer
- International Copper Association, New York, New York, USA
| | | | | | - Matti Jantunen
- Department of Environmental Health, National Institute for Health and Welfare, Kuopio, Finland
| | - Olivier Jolliet
- School of Public Health, University of Michigan, Ann Arbor, Michigan, USA
| | | | - Nienke Kirchhübel
- Quantitative Sustainability Assessment Division, Department of Management Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - Dingsheng Li
- School of Community Health Sciences, University of Nevada, Reno, Nevada, USA
| | - Aubrey Miller
- National Institute of Environmental Health Sciences, Bethesda, Maryland, USA
| | - Greg Paoli
- Risk Sciences International, Ottawa, Ontario, Canada
| | - Paul Price
- U.S. EPA, Research Triangle Park, North Carolina, USA
| | | | - Beverly Shen
- School of Public Health, University of California, Berkeley, California, USA
| | | | - Justin Teeguarden
- Health Effects and Exposure Science, Pacific Northwest National Laboratory, Richland, Washington, USA
| | | | - John Wambaugh
- U.S. EPA, Research Triangle Park, North Carolina, USA
| | | | - Rosemary Zaleski
- ExxonMobil Biomedical Sciences, Inc., Annandale, New Jersey, USA
| | - Thomas E McKone
- School of Public Health, University of California, Berkeley, California, USA
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Tian S, Ecoff S, Sebroski J, Miller J, Rickenbacker H, Bilec M. An indoor air quality evaluation in a residential retrofit project using spray polyurethane foam. JOURNAL OF OCCUPATIONAL AND ENVIRONMENTAL HYGIENE 2018; 15:363-375. [PMID: 29341859 DOI: 10.1080/15459624.2018.1428332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Understanding of indoor air quality (IAQ) during and after spray polyurethane foam (SPF) application is essential to protect the health of both workers and building occupants. Previous efforts such as field monitoring, micro-chamber/spray booth emission studies, and fate/transport modeling have been conducted to understand the chemical exposure of SPF and guide risk mitigation strategies. However, each type of research has its limitation and can only reveal partial information on the relationship between SPF and IAQ. A comprehensive study is truly needed to integrate the experimental design and analytical testing methods in the field/chamber studies with the mathematical tools employed in the modeling studies. This study aims to bridge this gap and provide a more comprehensive understanding on the impact of SPF to IAQ. The field sampling plan of this research aims to evaluate the airborne concentrations of methylene diphenyl diisocyanate (MDI), formaldehyde, acetaldehyde, propionaldehyde, tris(1-chlor-2-propyl)phosphate (TCPP), trans-1-chloro-3,3,3-trifluoropropene (SolsticeTM), and airborne particles. Modifications to existing MDI sampling and analytical methods were made so that level of quantification was improved. In addition, key fate and transport modeling input parameters such as air changes per hour and airborne particle size distribution were measured. More importantly, TCPP accumulation onto materials was evaluated, which is important to study the fate and transport of semi-volatile organic compounds. The IAQ results showed that after spray application was completed in the entire building, airborne concentrations decreased for all chemicals monitored. However, it is our recommendation that during SPF application, no one should return to the application site without proper personal protection equipment as long as there are active spray activities in the building. The comparison between this field study and a recent chamber study proved surface sorption and particle deposition is an important factor in determining the fate of airborne TCPP. The study also suggests the need for further evaluation by employing mathematical models, proving the data generated in this work as informative to industry and the broader scientific community.
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Affiliation(s)
- Shen Tian
- a Covestro LLC , Pittsburgh , Pennsylvania
- b Department of Civil and Environmental Engineering , University of Pittsburgh , Pittsburgh , Pennsylvania
| | | | | | | | - Harold Rickenbacker
- b Department of Civil and Environmental Engineering , University of Pittsburgh , Pittsburgh , Pennsylvania
| | - Melissa Bilec
- b Department of Civil and Environmental Engineering , University of Pittsburgh , Pittsburgh , Pennsylvania
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Tao M, Li D, Song R, Suh S, Keller AA. OrganoRelease - A framework for modeling the release of organic chemicals from the use and post-use of consumer products. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 234:751-761. [PMID: 29245149 DOI: 10.1016/j.envpol.2017.11.058] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Revised: 11/15/2017] [Accepted: 11/16/2017] [Indexed: 05/03/2023]
Abstract
Chemicals in consumer products have become the focus of recent regulatory developments including California's Safer Consumer Products Act. However, quantifying the amount of chemicals released during the use and post-use phases of consumer products is challenging, limiting the ability to understand their impacts. Here we present a comprehensive framework, OrganoRelease, for estimating the release of organic chemicals from the use and post-use of consumer products given limited information. First, a novel Chemical Functional Use Classifier estimates functional uses based on chemical structure. Second, the quantity of chemicals entering different product streams is estimated based on market share data of the chemical functional uses. Third, chemical releases are estimated based on either chemical product categories or functional uses by using the Specific Environmental Release Categories and EU Technological Guidance Documents. OrganoRelease connects 19 unique functional uses and 14 product categories across 4 data sources and provides multiple pathways for chemical release estimation. Available user information can be incorporated in the framework at various stages. The Chemical Functional Use Classifier achieved an average accuracy above 84% for nine functional uses, which enables the OrganoRelease to provide release estimates for the chemical, mostly using only the molecular structure. The results can be can be used as input for methods estimating environmental fate and exposure.
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Affiliation(s)
- Mengya Tao
- Bren School of Environmental Science and Management, University of California Santa Barbara, Santa Barbara, CA, 93106, United States.
| | - Dingsheng Li
- Bren School of Environmental Science and Management, University of California Santa Barbara, Santa Barbara, CA, 93106, United States.
| | - Runsheng Song
- Bren School of Environmental Science and Management, University of California Santa Barbara, Santa Barbara, CA, 93106, United States.
| | - Sangwon Suh
- Bren School of Environmental Science and Management, University of California Santa Barbara, Santa Barbara, CA, 93106, United States.
| | - Arturo A Keller
- Bren School of Environmental Science and Management, University of California Santa Barbara, Santa Barbara, CA, 93106, United States.
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27
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Ernstoff AS, Fantke P, Huang L, Jolliet O. High-throughput migration modelling for estimating exposure to chemicals in food packaging in screening and prioritization tools. Food Chem Toxicol 2017; 109:428-438. [DOI: 10.1016/j.fct.2017.09.024] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 06/09/2017] [Accepted: 09/14/2017] [Indexed: 11/29/2022]
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Huang L, Fantke P, Ernstoff A, Jolliet O. A quantitative property-property relationship for the internal diffusion coefficients of organic compounds in solid materials. INDOOR AIR 2017; 27:1128-1140. [PMID: 28548238 DOI: 10.1111/ina.12395] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Accepted: 05/20/2017] [Indexed: 05/10/2023]
Abstract
Indoor releases of organic chemicals encapsulated in solid materials are major contributors to human exposures and are directly related to the internal diffusion coefficient in solid materials. Existing correlations to estimate the diffusion coefficient are only valid for a limited number of chemical-material combinations. This paper develops and evaluates a quantitative property-property relationship (QPPR) to predict diffusion coefficients for a wide range of organic chemicals and materials. We first compiled a training dataset of 1103 measured diffusion coefficients for 158 chemicals in 32 consolidated material types. Following a detailed analysis of the temperature influence, we developed a multiple linear regression model to predict diffusion coefficients as a function of chemical molecular weight (MW), temperature, and material type (adjusted R2 of .93). The internal validations showed the model to be robust, stable and not a result of chance correlation. The external validation against two separate prediction datasets demonstrated the model has good predicting ability within its applicability domain (Rext2>.8), namely MW between 30 and 1178 g/mol and temperature between 4 and 180°C. By covering a much wider range of organic chemicals and materials, this QPPR facilitates high-throughput estimates of human exposures for chemicals encapsulated in solid materials.
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Affiliation(s)
- L Huang
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Abor, MI, USA
| | - P Fantke
- Division for Quantitative Sustainability Assessment, Department of Management Engineering, Technical University of Denmark, Lyngby, Denmark
| | - A Ernstoff
- Division for Quantitative Sustainability Assessment, Department of Management Engineering, Technical University of Denmark, Lyngby, Denmark
| | - O Jolliet
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Abor, MI, USA
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29
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Csiszar SA, Ernstoff AS, Fantke P, Jolliet O. Stochastic modeling of near-field exposure to parabens in personal care products. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2017; 27:152-159. [PMID: 26758569 DOI: 10.1038/jes.2015.85] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Revised: 11/18/2015] [Accepted: 11/18/2015] [Indexed: 05/20/2023]
Abstract
Exposure assessment is a key step in determining risks to chemicals in consumer goods, including personal care products (PCPs). Exposure models can be used to estimate exposures to chemicals in the absence of biomonitoring data and as tools in chemical risk prioritization and screening. We apply a PCP exposure model based on the product intake fraction (PiF), which is defined as the fraction of chemical in a product that is taken in by the exposed population, to estimate chemical intake based on physicochemical properties and PCP usage characteristics. The PiF can be used to estimate route and pathway-specific exposures during both the use and disposal stages of a product. As a case study, we stochastically quantified population level exposures to parabens in PCPs, and compared estimates with biomarker values. We estimated exposure based on the usage of PCPs in the female US population, taking into account population variability, product usage characteristics, paraben occurrence in PCPs and the PiF. Intakes were converted to urine levels and compared with National Health and Nutrition Examination Survey (NHANES) biomonitoring data. Results suggest that for parabens, chemical exposure during product use is substantially larger than environmentally mediated exposure after product disposal. Modeled urine concentrations reflect well the NHANES variation of three orders of magnitude across parabens for the 50th, 75th, 90th, and 95th percentiles and were generally in good agreement with measurements, when taking uncertainty into account. This study presents an approach to estimate multi-pathway exposure to chemicals in PCPs and can be used as a tool within exposure-based screening of chemicals as well in higher tier exposure estimates.
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Affiliation(s)
- Susan A Csiszar
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI, USA
| | - Alexi S Ernstoff
- Quantitative Sustainability Assessment Division, Department of Management Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - Peter Fantke
- Quantitative Sustainability Assessment Division, Department of Management Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - Olivier Jolliet
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI, USA
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30
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Huang L, Ernstoff A, Fantke P, Csiszar SA, Jolliet O. A review of models for near-field exposure pathways of chemicals in consumer products. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 574:1182-1208. [PMID: 27644856 DOI: 10.1016/j.scitotenv.2016.06.118] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Revised: 06/15/2016] [Accepted: 06/15/2016] [Indexed: 05/03/2023]
Abstract
Exposure to chemicals in consumer products has been gaining increasing attention, with multiple studies showing that near-field exposures from products is high compared to far-field exposures. Regarding the numerous chemical-product combinations, there is a need for an overarching review of models able to quantify the multiple transfers of chemicals from products used near-field to humans. The present review therefore aims at an in-depth overview of modeling approaches for near-field chemical release and human exposure pathways associated with consumer products. It focuses on lower-tier, mechanistic models suitable for life cycle assessments (LCA), chemical alternative assessment (CAA) and high-throughput screening risk assessment (HTS). Chemicals in a product enter the near-field via a defined "compartment of entry", are transformed or transferred to adjacent compartments, and eventually end in a "human receptor compartment". We first focus on models of physical mass transfers from the product to 'near-field' compartments. For transfers of chemicals from article interior, adequate modeling of in-article diffusion and of partitioning between article surface and air/skin/food is key. Modeling volatilization and subsequent transfer to the outdoor is crucial for transfers of chemicals used in the inner space of appliances, on object surfaces or directly emitted to indoor air. For transfers from skin surface, models need to reflect the competition between dermal permeation, volatilization and fraction washed-off. We then focus on transfers from the 'near-field' to 'human' compartments, defined as respiratory tract, gastrointestinal tract and epidermis, for which good estimates of air concentrations, non-dietary ingestion parameters and skin permeation are essential, respectively. We critically characterize for each exposure pathway the ability of models to estimate near-field transfers and to best inform LCA, CAA and HTS, summarizing the main characteristics of the potentially best-suited models. This review identifies large knowledge gaps for several near-field pathways and suggests research needs and future directions.
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Affiliation(s)
- Lei Huang
- Environmental Health Sciences & Risk Science Center, School of Public Health, University of Michigan, Ann Arbor, MI 48109-2029, United States.
| | - Alexi Ernstoff
- Quantitative Sustainability Assessment Division, Department of Management Engineering, Technical University of Denmark, 2808 Kgs. Lyngby, Denmark
| | - Peter Fantke
- Quantitative Sustainability Assessment Division, Department of Management Engineering, Technical University of Denmark, 2808 Kgs. Lyngby, Denmark
| | - Susan A Csiszar
- Oak Ridge Institute for Science and Education Research Participant, US Environmental Protection Agency, National Risk Management Research Laboratory, Cincinnati, OH 45268, United States
| | - Olivier Jolliet
- Environmental Health Sciences & Risk Science Center, School of Public Health, University of Michigan, Ann Arbor, MI 48109-2029, United States
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Kijko G, Jolliet O, Margni M. Occupational Health Impacts Due to Exposure to Organic Chemicals over an Entire Product Life Cycle. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:13105-13114. [PMID: 27794595 DOI: 10.1021/acs.est.6b04434] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
This article presents an innovative approach to include occupational exposures to organic chemicals in life cycle impact assessment (LCIA) by building on the characterization factors set out in Kijko et al. (2015) to calculate the potential impact of occupational exposure over the entire supply chain of product or service. Based on an economic input-output model and labor and economic data, the total impacts per dollar of production are provided for 430 commodity categories and range from 0.025 to 6.6 disability-adjusted life years (DALY) per million dollar of final economic demand. The approach is applied on a case study assessing human health impacts over the life cycle of a piece of office furniture. It illustrates how to combine monitoring data collected at the manufacturing facility and averaged sector specific data to model the entire supply chain. This paper makes the inclusion of occupational exposure to chemicals fully compatible with the LCA framework by including the supply chain of a given production process and will help industries focus on the leading causes of human health impacts and prevent impact shifting.
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Affiliation(s)
- Gaël Kijko
- CIRAIG, Polytechnique Montréal, Chemical Engineering Department, 3333 Chemin Queen-Mary, Suite 310, P.O. Box 6079, Station Centre-ville, Montréal, Quebec Canada, H3C 3A7
| | - Olivier Jolliet
- Department of Environmental Health Sciences, School of Public Health, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Manuele Margni
- CIRAIG, Polytechnique Montréal, Chemical Engineering Department, 3333 Chemin Queen-Mary, Suite 310, P.O. Box 6079, Station Centre-ville, Montréal, Quebec Canada, H3C 3A7
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32
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Csiszar SA, Ernstoff AS, Fantke P, Meyer DE, Jolliet O. High-throughput exposure modeling to support prioritization of chemicals in personal care products. CHEMOSPHERE 2016; 163:490-498. [PMID: 27565317 PMCID: PMC7359637 DOI: 10.1016/j.chemosphere.2016.07.065] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Revised: 07/12/2016] [Accepted: 07/21/2016] [Indexed: 05/20/2023]
Abstract
We demonstrate the application of a high-throughput modeling framework to estimate exposure to chemicals used in personal care products (PCPs). As a basis for estimating exposure, we use the product intake fraction (PiF), defined as the mass of chemical taken by an individual or population per mass of a given chemical used in a product. We calculated use- and disposal- stage PiFs for 518 chemicals for five PCP archetypes. Across all product archetypes the use- and disposal- stage PiFs ranged from 10(-5) to 1 and 0 to 10(-3), respectively. There is a distinction between the use-stage PiF for leave-on and wash-off products which had median PiFs of 0.5 and 0.02 across the 518 chemicals, respectively. The PiF is a function of product characteristics and physico-chemical properties and is maximized when skin permeability is high and volatility is low such that there is no competition between skin and air losses from the applied product. PCP chemical contents (i.e. concentrations) were available for 325 chemicals and were combined with PCP usage characteristics and PiF yielding intakes summed across a demonstrative set of products ranging from 10(-8)-30 mg/kg/d, with a median of 0.1 mg/kg/d. The highest intakes were associated with body lotion. Bioactive doses derived from high-throughput in vitro toxicity data were combined with the estimated PiFs to demonstrate an approach to estimate bioactive equivalent chemical content and to screen chemicals for risk.
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Affiliation(s)
- Susan A Csiszar
- Oak Ridge Institute for Science and Education (ORISE) Research Participation Program, hosted at U.S. Environmental Protection Agency, Cincinnati, OH, 45268, USA.
| | - Alexi S Ernstoff
- Quantitative Sustainability Assessment Division, Department of Management Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - Peter Fantke
- Quantitative Sustainability Assessment Division, Department of Management Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - David E Meyer
- Office of Research and Development, National Risk Management Research Laboratory, U.S. Environmental Protection Agency, Cincinnati, OH 45268, USA
| | - Olivier Jolliet
- Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI, USA.
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Csiszar SA, Meyer DE, Dionisio KL, Egeghy P, Isaacs KK, Price PS, Scanlon KA, Tan YM, Thomas K, Vallero D, Bare JC. Conceptual Framework To Extend Life Cycle Assessment Using Near-Field Human Exposure Modeling and High-Throughput Tools for Chemicals. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:11922-11934. [PMID: 27668689 PMCID: PMC7388028 DOI: 10.1021/acs.est.6b02277] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Life Cycle Assessment (LCA) is a decision-making tool that accounts for multiple impacts across the life cycle of a product or service. This paper presents a conceptual framework to integrate human health impact assessment with risk screening approaches to extend LCA to include near-field chemical sources (e.g., those originating from consumer products and building materials) that have traditionally been excluded from LCA. A new generation of rapid human exposure modeling and high-throughput toxicity testing is transforming chemical risk prioritization and provides an opportunity for integration of screening-level risk assessment (RA) with LCA. The combined LCA and RA approach considers environmental impacts of products alongside risks to human health, which is consistent with regulatory frameworks addressing RA within a sustainability mindset. A case study is presented to juxtapose LCA and risk screening approaches for a chemical used in a consumer product. The case study demonstrates how these new risk screening tools can be used to inform toxicity impact estimates in LCA and highlights needs for future research. The framework provides a basis for developing tools and methods to support decision making on the use of chemicals in products.
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Affiliation(s)
- Susan A Csiszar
- Oak Ridge Institute for Science and Education (ORISE) Research Participation Program, hosted at U.S. Environmental Protection Agency , Cincinnati, Ohio 45268, United States
| | - David E Meyer
- Office of Research and Development, National Risk Management Research Laboratory, U.S. Environmental Protection Agency , Cincinnati, Ohio 45268, United States
| | - Kathie L Dionisio
- Office of Research and Development, National Exposure Research Laboratory, U.S. Environmental Protection Agency , Research Triangle Park, North Carolina 27711, United States
| | - Peter Egeghy
- Office of Research and Development, National Exposure Research Laboratory, U.S. Environmental Protection Agency , Research Triangle Park, North Carolina 27711, United States
| | - Kristin K Isaacs
- Office of Research and Development, National Exposure Research Laboratory, U.S. Environmental Protection Agency , Research Triangle Park, North Carolina 27711, United States
| | - Paul S Price
- Office of Research and Development, National Exposure Research Laboratory, U.S. Environmental Protection Agency , Research Triangle Park, North Carolina 27711, United States
| | - Kelly A Scanlon
- AAAS Science & Technology Policy Fellow hosted by the U.S. Environmental Protection Agency, Office of Air and Radiation, Office of Radiation and Indoor Air, Washington, DC 20460, United States
| | - Yu-Mei Tan
- Office of Research and Development, National Exposure Research Laboratory, U.S. Environmental Protection Agency , Research Triangle Park, North Carolina 27711, United States
| | - Kent Thomas
- Office of Research and Development, National Exposure Research Laboratory, U.S. Environmental Protection Agency , Research Triangle Park, North Carolina 27711, United States
| | - Daniel Vallero
- Office of Research and Development, National Exposure Research Laboratory, U.S. Environmental Protection Agency , Research Triangle Park, North Carolina 27711, United States
| | - Jane C Bare
- Office of Research and Development, National Risk Management Research Laboratory, U.S. Environmental Protection Agency , Cincinnati, Ohio 45268, United States
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Fantke P, Ernstoff AS, Huang L, Csiszar SA, Jolliet O. Coupled near-field and far-field exposure assessment framework for chemicals in consumer products. ENVIRONMENT INTERNATIONAL 2016; 94:508-518. [PMID: 27318619 DOI: 10.1016/j.envint.2016.06.010] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Revised: 06/02/2016] [Accepted: 06/08/2016] [Indexed: 05/20/2023]
Abstract
Humans can be exposed to chemicals in consumer products through product use and environmental emissions over the product life cycle. Exposure pathways are often complex, where chemicals can transfer directly from products to humans during use or exchange between various indoor and outdoor compartments until sub-fractions reach humans. To consistently evaluate exposure pathways along product life cycles, a flexible mass balance-based assessment framework is presented structuring multimedia chemical transfers in a matrix of direct inter-compartmental transfer fractions. By matrix inversion, we quantify cumulative multimedia transfer fractions and exposure pathway-specific product intake fractions defined as chemical mass taken in by humans per unit mass of chemical in a product. Combining product intake fractions with chemical mass in the product yields intake estimates for use in life cycle impact assessment and chemical alternatives assessment, or daily intake doses for use in risk-based assessment and high-throughput screening. Two illustrative examples of chemicals used in personal care products and flooring materials demonstrate how this matrix-based framework offers a consistent and efficient way to rapidly compare exposure pathways for adult and child users and for the general population. This framework constitutes a user-friendly approach to develop, compare and interpret multiple human exposure scenarios in a coupled system of near-field ('user' environment), far-field and human intake compartments, and helps understand the contribution of individual pathways to overall human exposure in various product application contexts to inform decisions in different science-policy fields for which exposure quantification is relevant.
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Affiliation(s)
- Peter Fantke
- Quantitative Sustainability Assessment Division, Department of Management Engineering, Technical University of Denmark, Produktionstorvet 424, 2800 Kgs. Lyngby, Denmark.
| | - Alexi S Ernstoff
- Quantitative Sustainability Assessment Division, Department of Management Engineering, Technical University of Denmark, Produktionstorvet 424, 2800 Kgs. Lyngby, Denmark
| | - Lei Huang
- Environmental Health Sciences, University of Michigan, 1415 Washington Heights, Ann Arbor, MI 48109-2029, USA
| | - Susan A Csiszar
- Oak Ridge Institute for Science and Education hosted at the U.S. Environmental Protection Agency, National Risk Management Research Laboratory, Cincinnati, OH 45268, USA
| | - Olivier Jolliet
- Environmental Health Sciences, University of Michigan, 1415 Washington Heights, Ann Arbor, MI 48109-2029, USA
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Ernstoff AS, Fantke P, Csiszar SA, Henderson AD, Chung S, Jolliet O. Multi-pathway exposure modeling of chemicals in cosmetics with application to shampoo. ENVIRONMENT INTERNATIONAL 2016; 92-93:87-96. [PMID: 27062422 DOI: 10.1016/j.envint.2016.03.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Revised: 03/14/2016] [Accepted: 03/14/2016] [Indexed: 05/20/2023]
Abstract
We present a novel multi-pathway, mass balance based, fate and exposure model compatible with life cycle and high-throughput screening assessments of chemicals in cosmetic products. The exposures through product use as well as post-use emissions and environmental media were quantified based on the chemical mass originally applied via a product, multiplied by the product intake fractions (PiF, the fraction of a chemical in a product that is taken in by exposed persons) to yield intake rates. The average PiFs for the evaluated chemicals in shampoo ranged from 3×10(-4) up to 0.3 for rapidly absorbed ingredients. Average intake rates ranged between nano- and micrograms per kilogram bodyweight per day; the order of chemical prioritization was strongly affected by the ingredient concentration in shampoo. Dermal intake and inhalation (for 20% of the evaluated chemicals) during use dominated exposure, while the skin permeation coefficient dominated the estimated uncertainties. The fraction of chemical taken in by a shampoo user often exceeded, by orders of magnitude, the aggregated fraction taken in by the population through post-use environmental emissions. Chemicals with relatively high octanol-water partitioning and/or volatility, and low molecular weight tended to have higher use stage exposure. Chemicals with low intakes during use (<1%) and subsequent high post-use emissions, however, may yield comparable intake for a member of the general population. The presented PiF based framework offers a novel and critical advancement for life cycle assessments and high-throughput exposure screening of chemicals in cosmetic products demonstrating the importance of consistent consideration of near- and far-field multi-pathway exposures.
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Affiliation(s)
- Alexi S Ernstoff
- Quantitative Sustainability Assessment Division, Department of Management Engineering, Technical University of Denmark, Produktionstorvet 424, 2800 Kgs. Lyngby, Denmark; Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI 48109-2029, USA.
| | - Peter Fantke
- Quantitative Sustainability Assessment Division, Department of Management Engineering, Technical University of Denmark, Produktionstorvet 424, 2800 Kgs. Lyngby, Denmark
| | - Susan A Csiszar
- Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI 48109-2029, USA
| | - Andrew D Henderson
- United States Environmental Protection Agency, Sustainable Technology Division, Systems Analysis Branch, National Risk Management Research Laboratory, Cincinnati, OH 45268, USA; Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI 48109-2029, USA
| | - Susie Chung
- Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI 48109-2029, USA
| | - Olivier Jolliet
- Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI 48109-2029, USA
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Teeguarden JG, Tan YM, Edwards SW, Leonard JA, Anderson KA, Corley RA, Harding AK, Kile ML, Simonich SM, Stone D, Tanguay RL, Waters KM, Harper SL, Williams DE. Completing the Link between Exposure Science and Toxicology for Improved Environmental Health Decision Making: The Aggregate Exposure Pathway Framework. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:4579-86. [PMID: 26759916 PMCID: PMC4854780 DOI: 10.1021/acs.est.5b05311] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Driven by major scientific advances in analytical methods, biomonitoring, computation, and a newly articulated vision for a greater impact in public health, the field of exposure science is undergoing a rapid transition from a field of observation to a field of prediction. Deployment of an organizational and predictive framework for exposure science analogous to the "systems approaches" used in the biological sciences is a necessary step in this evolution. Here we propose the aggregate exposure pathway (AEP) concept as the natural and complementary companion in the exposure sciences to the adverse outcome pathway (AOP) concept in the toxicological sciences. Aggregate exposure pathways offer an intuitive framework to organize exposure data within individual units of prediction common to the field, setting the stage for exposure forecasting. Looking farther ahead, we envision direct linkages between aggregate exposure pathways and adverse outcome pathways, completing the source to outcome continuum for more meaningful integration of exposure assessment and hazard identification. Together, the two frameworks form and inform a decision-making framework with the flexibility for risk-based, hazard-based, or exposure-based decision making.
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Affiliation(s)
- Justin. G. Teeguarden
- Health Effects and Exposure Science, Pacific Northwest
National Laboratory, Richland, WA 99352
- Department of Environmental and Molecular Toxicology, Oregon
State University, Corvallis, OR 93771
- Corresponding Author: 902 Battelle Blvd. Richland, WA
99352, (P) 509-376-4262,
| | - Yu-Mei Tan
- National Exposure Research Laboratory, U.S. Environmental
Protection Agency, Durham, NC 27709
| | - Stephen W. Edwards
- National Health and Environmental Effects Research Laboratory,
U.S. Environmental Protection Agency, Durham, NC 27709
| | - Jeremy A. Leonard
- Oak Ridge Institute for Science and Education, Oak Ridge,
Tennessee 37831
| | - Kim A. Anderson
- Department of Environmental and Molecular Toxicology, Oregon
State University, Corvallis, OR 93771
| | - Richard A. Corley
- Health Effects and Exposure Science, Pacific Northwest
National Laboratory, Richland, WA 99352
- Department of Environmental and Molecular Toxicology, Oregon
State University, Corvallis, OR 93771
| | - Anna K Harding
- School of Biological and Population Health Sciences, Oregon
State University, Corvallis, OR 93771
| | - Molly L. Kile
- School of Biological and Population Health Sciences, Oregon
State University, Corvallis, OR 93771
| | - Staci M Simonich
- Department of Environmental and Molecular Toxicology, Oregon
State University, Corvallis, OR 93771
| | - David Stone
- Department of Environmental and Molecular Toxicology, Oregon
State University, Corvallis, OR 93771
| | - Robert L. Tanguay
- Department of Environmental and Molecular Toxicology, Oregon
State University, Corvallis, OR 93771
| | - Katrina M. Waters
- Health Effects and Exposure Science, Pacific Northwest
National Laboratory, Richland, WA 99352
- Department of Environmental and Molecular Toxicology, Oregon
State University, Corvallis, OR 93771
| | - Stacey L. Harper
- Department of Environmental and Molecular Toxicology, Oregon
State University, Corvallis, OR 93771
- School of Chemical, Biological and Environmental
Engineering, Oregon State University, Corvallis, OR 97331
| | - David E. Williams
- Department of Environmental and Molecular Toxicology, Oregon
State University, Corvallis, OR 93771
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