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Lin N, Ding N, Meza-Wilson E, Devasurendra AM, Godwin C, Park SK, Batterman S. Volatile Organic Compounds in Disposable Diapers and Baby Wipes in the US: A Survey of Products and Health Risks. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:13732-13743. [PMID: 37683294 DOI: 10.1021/acs.est.3c02862] [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] [Indexed: 09/10/2023]
Abstract
Many thousands of diapers are worn by young children and the elderly, who have thin and sensitive skin that is highly vulnerable to chemicals, including volatile organic compounds (VOCs) that may be ingredients of these products or present as inadvertent or residual components. The levels and potential health risks of VOCs in diapers have not been reported previously. In this study, we collected 31 disposable hygiene products in the US market based on market share and analyzed 98 target VOCs using purge and trap sampling and thermal desorption/gas chromatography/mass spectrometer analysis. Exposures and risks were modeled using reasonable upper level exposure scenarios. Adult diapers contained the highest total target VOC concentration (median level of 23.5 μg/g), and the predominant VOCs were alkanes. In some diapers, the estimated noncancer risk from these VOCs was sometimes very large (hazard quotient of 1609) due to n-heptane. Baby diapers contained several known or suspected carcinogens, including benzene and 1,4-dioxane, and the lifetime cancer risk from some diapers approached 1 per million under a worst-case scenario. Store-brand products had higher levels of VOCs than generic brands, and products labeled "organic" or "for sensitive skin" did not necessarily have lower levels. Our results show that toxic VOCs were found in all tested disposable diapers and wipes at trace levels, and risks from using some diapers in high use exposure scenarios are high enough to warrant additional attention and possibly corrective measures. We recommend eliminating and monitoring toxic ingredients and disclosing all chemicals that may be in these products.
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Affiliation(s)
- Nan Lin
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, Michigan 48109, United States
- Department of Environmental Health, School of Public Health, Shanghai Jiao Tong University, Shanghai 200025, China
| | - Ning Ding
- Department of Epidemiology, School of Public Health, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Emily Meza-Wilson
- College of Literature, Science, and the Arts, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Amila Manuradha Devasurendra
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Christopher Godwin
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Sung Kyun Park
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, Michigan 48109, United States
- Department of Epidemiology, School of Public Health, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Stuart Batterman
- 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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Kissel JC, Titaley IA, Muensterman DJ, Field JA. Evaluating Neutral PFAS for Potential Dermal Absorption from the Gas Phase. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:4951-4958. [PMID: 36917694 DOI: 10.1021/acs.est.2c08835] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Exposures to per- and polyfluoroalkyl substances (PFAS) are of increasing concern. Assessments typically focus only on ingestion and inhalation exposure due to a lack of generally accepted approaches for estimating dermal absorption. Prior work indicates limited dermal absorption of ionic PFAS, but absorption of neutral PFAS has not been examined from the liquid vehicle or from vapor. Partitioning of semivolatile organic compounds from the gas phase to the skin surface (i.e., stratum corneum) is well known, but the potential for partitioning of neutral PFAS from the gas phase to the stratum corneum has yet to be estimated. The SPARC-estimated physicochemical properties were used to calculate transdermal permeability coefficients (kp_g) and dermal-to-inhalation (D/I) exposure ratios for two groups of neutral PFAS, including those on a U.S. Environmental Protection Agency PFAS list. 11 neutral PFAS gave calculated D/I ratios >5, indicating that direct transdermal absorption may be an important exposure pathway compared to inhalation. Data on consumer products or indoor air is needed for the 11 neutral PFAS, followed by possible biomonitoring to experimentally verify dermal absorption from air. Additional PFAS should be estimated by the protocol used here as they are identified in commercial products.
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Affiliation(s)
- John C Kissel
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington 98105, United States
| | - Ivan A Titaley
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, Oregon 97331, United States
| | - Derek J Muensterman
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, United States
| | - Jennifer A Field
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, Oregon 97331, United States
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3
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Sahmel J, Arnold SF, Ramachandran G. Accuracy of professional judgments for dermal exposure assessment using deterministic models. JOURNAL OF OCCUPATIONAL AND ENVIRONMENTAL HYGIENE 2023; 20:143-158. [PMID: 36716165 DOI: 10.1080/15459624.2023.2173365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The accuracy of exposure judgments, particularly for scenarios where only qualitative information is available or a systematic approach is not used, has been evaluated and shown to have a relatively low level of accuracy. This is particularly true for dermal exposures, where less information is generally available compared to inhalation exposures. Relatively few quantitative validation efforts have been performed for scenarios where dermal exposures are of interest. In this study, a series of dermal exposure judgments were collected from 90 volunteer U.S. occupational health practitioners in a workshop format to assess the accuracy of their judgments for three specific scenarios. Accuracy was defined as the ability of the participants to identify the correct reference exposure category, as defined by the quantitative exposure banding categories utilized by the American Industrial Hygiene Association (AIHA®). The participants received progressively additional information and training regarding dermal exposure assessments and scenario-specific information during the workshop, and the relative accuracy of their category judgments over time was compared. The results of the study indicated that despite substantial education and training in exposure assessment generally, the practitioners had very little experience in performing dermal exposure assessments and a low level of comfort in performing these assessments. Further, contrary to studies of practitioners performing inhalation exposure assessments demonstrating a trend toward underestimating exposures, participants in this study consistently overestimated the potential for dermal exposure without quantitative data specific to the scenario of interest. Finally, it was found that participants were able to identify the reference or "true" category of dermal exposure acceptability when provided with relevant, scenario-specific dermal and/or surface-loading data for use in the assessment process. These results support the need for additional training and education of practitioners in performing dermal exposure assessments. A closer analysis of default loading values used in dermal exposure assessments to evaluate their accuracy relative to real-world or measured dermal loading values, along with consistent improvements in current dermal models, is also needed.
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Affiliation(s)
- Jennifer Sahmel
- Insight Exposure & Risk Sciences, Boulder, Colorado
- Environmental Health Sciences, School of Public Health, University of Minnesota, Minneapolis, Minnesota
| | - Susan F Arnold
- Environmental Health Sciences, School of Public Health, University of Minnesota, Minneapolis, Minnesota
| | - Gurumurthy Ramachandran
- Bloomberg School of Public Health, Environmental Health and Engineering, Johns Hopkins University, Baltimore, Maryland
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4
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Lynch HN, Gloekler LE, Allen LH, Maskrey JR, Bevan C, Maier A. Analysis of dermal exposure assessment in the US Environmental Protection Agency Toxic Substances Control Act risk evaluations of chemical manufacturing. Toxicol Ind Health 2023; 39:49-65. [PMID: 36420912 PMCID: PMC9817111 DOI: 10.1177/07482337221140946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The United States Environmental Protection Agency (EPA) regulates chemical manufacture, import, processing, distribution, use, and disposal under the 2016 amended Toxic Substances Control Act (TSCA) for the purposes of protecting the public and sensitive populations-including workers-from chemical exposure risk. The publication of several TSCA risk evaluations provided a unique opportunity to evaluate the evolving regulatory approach for assessing the dermal exposure pathway in occupational settings. In this analysis, the occupational dermal exposure assessment methods employed in several TSCA risk evaluations were assessed. Specifically, a methodology review was conducted for the occupational dermal scenarios of manufacturing and feedstock use in the risk evaluations of three chlorinated organic chemicals: trichloroethylene, carbon tetrachloride, and perchloroethylene. Additionally, alternative exposure estimates were generated using the exposure model IH SkinPermTM. The review and alternative exposure analyses indicate that the current TSCA modeling approach may generate total dermal absorbed doses for chlorinated chemical manufacturing and feedstock use scenarios that are 2- to 20-fold higher than those generated by IH SkinPerm. Best-practice recommendations developed in the methodology review support a tiered, integrated approach to dermal exposure assessment that emphasizes collecting qualitative data; employing validated, peer-reviewed models that align with current industrial practices; and gathering empirical sampling data where needed. Collaboration among industry, EPA, and other stakeholders to share information and develop a standard approach to exposure assessment under TSCA would improve the methodological rigor of, and increase confidence in, the risk evaluation results.
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Affiliation(s)
- Heather N Lynch
- Stantec
(ChemRisk), Boston, MA, USA,Heather N Lynch, Stantec (ChemRisk), 607
Boylston Street, Boston, MA 02116, USA.
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5
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Lear K, Simon L. A method to assess dermal absorption dynamics of chemical warfare agents: Finite doses of volatile compounds. JOURNAL OF OCCUPATIONAL AND ENVIRONMENTAL HYGIENE 2022; 19:603-614. [PMID: 35969798 DOI: 10.1080/15459624.2022.2112684] [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: 06/15/2023]
Abstract
Chemical warfare agents are absorbed into the body from various entry routes and may have detrimental effects on human health. As many chemical compounds in this group are lipophilic, the outer layer of the skin is at an elevated risk. This contribution explores the dynamics of skin penetration for risk assessment. A previously validated model was applied to describe how an agent is transported across the stratum corneum following dermal exposure to a finite dose of a chemical. A mathematical construct was implemented for estimating the time constants and the cumulative amount of permeant entering the bloodstream or being released into the environment. Empirical equations were selected to determine the ratio of the steady-state evaporation rate to the steady-state dermal absorption rate and the physicochemical properties of the chemical warfare agents. Wolfram Mathematica was employed to run the simulations. The results from the newly derived expressions for the time constants matched those directly obtained from the validated model. For example, sarin gas had steady-state evaporation to an absorption rate of 991.25, and a total fractional absorption and evaporation of 5.1% and 94.9%, respectively. Combined with occupational exposure limits, the findings can help researchers assess an individual's risk level and develop protection programs.
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Affiliation(s)
- Koko Lear
- Otto H. York Department and Chemical and Materials Engineering, New Jersey Institute of Technology, Newark, New Jersey
| | - Laurent Simon
- Otto H. York Department and Chemical and Materials Engineering, New Jersey Institute of Technology, Newark, New Jersey
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Gorman Ng M, Cherrie JW, Sleeuwenhoek A, Stenzel M, Kwok RK, Engel LS, Cavallari JM, Blair A, Sandler DP, Stewart P. GuLF DREAM: A Model to Estimate Dermal Exposure Among Oil Spill Response and Clean-up Workers. Ann Work Expo Health 2022; 66:i218-i233. [PMID: 31334553 PMCID: PMC8989037 DOI: 10.1093/annweh/wxz037] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Revised: 02/14/2019] [Accepted: 04/29/2019] [Indexed: 12/17/2023] Open
Abstract
Tens of thousands of individuals performed oil spill response and clean-up (OSRC) activities following the 'Deepwater Horizon' oil drilling rig explosion in 2010. Many were exposed to oil residues and dispersants. The US National Institute of Environmental Health Sciences assembled a cohort of nearly 33 000 workers to investigate potential adverse health effects of oil spill exposures. Estimates of dermal and inhalation exposure are required for those individuals. Ambient breathing-zone measurements taken at the time of the spill were used to estimate inhalation exposures for participants in the GuLF STUDY (Gulf Long-term Follow-up Study), but no dermal measurements were collected. Consequently, a modelling approach was used to estimate dermal exposures. We sought to modify DREAM (DeRmal Exposure Assessment Method) to optimize the model for assessing exposure to various oil spill-related substances and to incorporate advances in dermal exposure research. Each DREAM parameter was reviewed in the context of literature published since 2000 and modified where appropriate. To reflect the environment in which the OSRC work took place, the model treatment of evaporation was expanded to include vapour pressure and wind speed, and the effect of seawater on exposure was added. The modified model is called GuLF DREAM and exposure is estimated in GuLF DREAM units (GDU). An external validation to assess the performance of the model for oils, tars, and fuels was conducted using available published dermal wipe measurements of heavy fuel oil (HFO) and dermal hand wash measurements of asphalt. Overall, measured exposures had moderate correlations with GDU estimates (r = 0.59) with specific correlations of -0.48 for HFO and 0.68 for asphalt. The GuLF DREAM model described in this article has been used to generate dermal exposure estimates for the GuLF STUDY. Many of the updates made were generic, so the updated model may be useful for other dermal exposure scenarios.
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Affiliation(s)
- Melanie Gorman Ng
- Centre for Human Exposure Science, Institute of Occupational Medicine, Research Avenue North, Edinburgh, EH14 4AP, UK
- School of Population and Public Health, University of British Columbia, Vancouver, BC V6T 1Z3, Canada
| | - John W Cherrie
- Centre for Human Exposure Science, Institute of Occupational Medicine, Research Avenue North, Edinburgh, EH14 4AP, UK
- Institute of Biological Chemistry, Biophysics and Bioengineering, Heriot Watt University, Edinburgh EH14 4AS, UK
| | - Anne Sleeuwenhoek
- Centre for Human Exposure Science, Institute of Occupational Medicine, Research Avenue North, Edinburgh, EH14 4AP, UK
| | - Mark Stenzel
- Exposure Assessment Applications, LLC, Arlington, VA 22207, USA
| | - Richard K Kwok
- Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC 27709, USA
| | - Lawrence S Engel
- Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC 27709, USA
- Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Jennifer M Cavallari
- Department of Community Medicine, University of Connecticut School of Medicine, Farmington, CT 06032, USA
| | - Aaron Blair
- Occupational and Environmental Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, Rockville, MD 27709, USA
| | - Dale P Sandler
- Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC 27709, USA
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7
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Zhang Z, Wang S, Li L. Emerging investigator series: the role of chemical properties in human exposure to environmental chemicals. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2021; 23:1839-1862. [PMID: 34542121 DOI: 10.1039/d1em00252j] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
One of the ultimate goals of environmental exposure science is to mechanistically understand how chemical properties and human behavior interactively determine human exposure to the wide spectrum of chemicals present in the environment. This comprehensive review assembles state-of-the-art knowledge of the role of partitioning, dissociation, mass transfer, and reactive properties in human contact with and absorption of organic chemicals via oral, dermal, and respiratory routes. Existing studies have revealed that chemicals with different properties vary greatly in mass distribution and occurrence among multiple exposure media, resulting in distinct patterns of human intake from the environment. On the other hand, these chemicals encounter different levels of resistance in the passage of intestinal, dermal, and pulmonary absorption barriers and demonstrate different levels of bioavailability, due to the selectivity of biochemical, anatomical and physiological structures of these absorption barriers. Moving forward, the research community needs to gain more in-depth mechanistic insights into the complex processes in human exposure, advance the technique to better characterize and predict chemical properties, generate and leverage experimental data for a more diverse range of chemicals, and describe better the interactions between chemical properties and human behavior.
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Affiliation(s)
- Zhizhen Zhang
- School of Public Health, University of Nevada Reno, 1664 N. Virginia Street, 89557-274, Reno, Nevada, USA.
| | - Shenghong Wang
- School of Public Health, University of Nevada Reno, 1664 N. Virginia Street, 89557-274, Reno, Nevada, USA.
| | - Li Li
- School of Public Health, University of Nevada Reno, 1664 N. Virginia Street, 89557-274, Reno, Nevada, USA.
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8
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Perfume and Flavor Engineering: A Chemical Engineering Perspective. Molecules 2021; 26:molecules26113095. [PMID: 34067262 PMCID: PMC8196857 DOI: 10.3390/molecules26113095] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 05/18/2021] [Accepted: 05/20/2021] [Indexed: 11/17/2022] Open
Abstract
In the last two decades, scientific methodologies for the prediction of the design, performance and classification of fragrance mixtures have been developed at the Laboratory of Separation and Reaction Engineering. This review intends to give an overview of such developments. It all started with the question: what do we smell? The Perfumery Ternary Diagram enables us to determine the dominant odor for each perfume composition. Evaporation and 1D diffusion model is analyzed based on vapor-liquid equilibrium and Fick's law for diffusion giving access to perfume performance parameters. The effect of matrix and skin is addressed and the trail of perfumes analyzed. Classification of perfumes with the perfumery radar is discussed. The methodology is extended to flavor and taste engineering. Finally, future research directions are suggested.
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9
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Gaskin S, Currie N, Cherrie JW. What Do Occupational Hygienists Really Know About Skin Exposure? Ann Work Expo Health 2021; 65:219-224. [PMID: 32537653 DOI: 10.1093/annweh/wxaa046] [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: 01/23/2020] [Revised: 03/31/2020] [Accepted: 04/21/2020] [Indexed: 11/13/2022] Open
Abstract
This article describes responses to a questionnaire on current work practices and understanding of the management of dermal exposure issues in the workplace from members of the British Occupational Hygiene Society (BOHS) and the Australian Institute of Occupational Hygienists (AIOH). The survey comprised questions in four key areas: employment demographics, experience managing dermal exposure, knowledge of dermal exposure management, and opinions on professional knowledge gaps and preferred training methods. The survey was disseminated in 2016 in the UK and 2018 in Australia, with 116 and 114 responses from each jurisdiction, respectively. The majority of respondents had personally evaluated the risks of dermal exposure to chemicals (BOHS 92%; AIOH 86%), albeit infrequently (less than a few times per year). Occupational Hygienists reportedly adopted a range of strategies to control dermal exposure problems, including chemical elimination/substitution (BOHS 68%; AIOH 68%), changing work practices (BOHS 79%; AIOH 75%), and education (BOHS 77%; AIOH 83%). The use of gloves or other personal protective equipment remained the most commonly cited exposure control measure (BOHS 99%; AIOH 97%). While there appeared to be a good understanding of common dermal exposure workplace scenarios (e.g. isocyanate exposure in motor vehicle repair, solvent exposure during spray painting), the overwhelming majority of respondents wished to find out more about assessing the risks from dermal exposure to chemicals (BOHS 89%; AIOH 88%). The outcomes suggest ways to increase the competence of professionals in dealing with dermal exposure matters in the workplace, through mechanisms such as web-based guidance, interactive educational materials and webinars, as well as workshops and seminars.
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Affiliation(s)
- Sharyn Gaskin
- Adelaide Exposure Science and Health, University of Adelaide, Thebarton, South Australia, Australia
| | - Naomi Currie
- Adelaide Exposure Science and Health, University of Adelaide, Thebarton, South Australia, Australia
| | - John W Cherrie
- Institute of Biological Chemistry, Biophysics and Bioengineering, Heriot-Watt University, Riccarton, Edinburgh, UK.,Institute of Occupational Medicine, Research Avenue North, Edinburgh, UK
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10
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Li L, Hughes L, Arnot JA. Addressing uncertainty in mouthing-mediated ingestion of chemicals on indoor surfaces, objects, and dust. ENVIRONMENT INTERNATIONAL 2021; 146:106266. [PMID: 33395928 DOI: 10.1016/j.envint.2020.106266] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Revised: 10/02/2020] [Accepted: 11/05/2020] [Indexed: 05/25/2023]
Abstract
In indoor environments, humans ingest chemicals present as surface residues and bound to settled particles (dust), through mouthing hands (hand-to-mouth transfer) and objects (object-to-mouth transfer). Here, we introduce a novel modeling approach in support of systematic investigation into the mouthing-mediated ingestion of chemicals present in indoor environments. This model explicitly considers the indoor dynamics of dust and chemicals, building on mechanistic links with physicochemical properties of chemicals, features of the indoor environment, and human activity patterns. The evaluation of this model demonstrates that it satisfactorily reproduces chemical hand loadings and exposure data reported in the literature. We then use the evaluated model to investigate the response of mouthing-mediated ingestion to chemical partitioning between the gas phase and solid phases, expressed as the octanol-air partition coefficient (KOA). Assuming a unit emission rate to the indoor environment, we find that low-volatility chemicals (with a KOA greater than 109) are more efficiently enriched in hand skin, resulting in higher mouthing-mediated ingestion than other compounds. For individuals living in a room with a typical level of dustiness, more than half of the chemical mass found in their hands comes from dust transfer, whereas more than half of the chemical mass ingested is the fraction present as residues on hands. We also use the new model to explore how the mouthing-mediated ingestion of chemicals is dependent on factors describing the indoor environment and human behavior. The model predicts that less frequent cleaning leads to higher accumulation of dust on indoor surfaces, thereby transferring more chemicals to hands and mouth in each contact. Introducing more dust into the room, but maintaining the same cleanup frequency, increases the dustiness of indoor surfaces, which promotes the transfer of relatively volatile chemicals (with a KOA lower than 109) to hands and mouth but decreases the transfer of chemicals with low volatility. More frequent hand contact with indoor surfaces increases both the hand loading and mouthing-mediated ingestion of chemicals, but the increases are more remarkable for adults than children because the higher surface contact frequency of children "saturates" hand loadings. An increase in handwashing frequency lowers the hand loading and mouthing-mediated ingestion of chemicals and this mitigating process is more prominent for relatively volatile chemicals. The new evaluated modeling approach can facilitate the prediction of mouthing-mediated ingestion for various age groups and the model predictions can be used to aid future fate and (bio)monitoring studies focusing on indoor contamination.
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Affiliation(s)
- Li Li
- School of Community Health Sciences, University of Nevada Reno, Reno, NV 89557, United States.
| | - Lauren Hughes
- ARC Arnot Research & Consulting, Toronto, Ontario M4M 1W4, Canada
| | - Jon A Arnot
- ARC Arnot Research & Consulting, Toronto, Ontario M4M 1W4, Canada; Department of Physical & Environmental Sciences, University of Toronto Scarborough, Toronto, Ontario M1C 1A4, Canada; Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario M5S 1A8, Canada
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11
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Lin N, Ding N, Meza-Wilson E, Manuradha Devasurendra A, Godwin C, Kyun Park S, Batterman S. Volatile organic compounds in feminine hygiene products sold in the US market: A survey of products and health risks. ENVIRONMENT INTERNATIONAL 2020; 144:105740. [PMID: 32866732 PMCID: PMC7958867 DOI: 10.1016/j.envint.2020.105740] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 03/26/2020] [Accepted: 04/13/2020] [Indexed: 05/04/2023]
Abstract
Feminine hygiene products (FHPs) are used on highly permeable and sensitive vaginal and vulvar tissues by many women. These products contain a variety of chemicals, and few regulations require disclosure of their ingredients. The objectives of this study are to identify volatile organic compounds (VOCs) that may be present in these products and to evaluate the potential for exposure and health risk associated with product use. We collected 79 commercially available FHPs, including washes, tampons, menstrual pads, wipes, sprays, powders and moisturizers, and analyzed their composition using purge and trap sampling, thermal desorption, gas chromatography and mass spectroscopy. Exposures and risks were modeled using reasonable upper bound exposure scenarios. The highest VOC concentrations (as total target VOCs) were found in washes, sprays and powders, with median concentrations from 25,000 to 34,000 ng/g. Benzene (maximum: 3,604 ng/g) was detected in 83% of the collected products, and 1,4-dioxane (maximum: 24,354 ng/g) in 50% of the products. VOC composition depended on the FHP type, manufacturer and brand. Products labeled as "organic," "natural," or "for sensitive skin" did not necessarily have lower VOC concentrations. For most FHPs, calculated risks were low; however, menstrual pads had hazard ratios of up to 11, sprays and powders had hazard ratios of up to 2.2 and excess cancer risks of up to 2.1 × 10-6, and washes had excess cancer risks of up to 3.3 × 10-6. Our data suggest that all tested FHPs contained some toxic VOCs, and that risks of using some products should be addressed. We recommend the elimination of toxic ingredients and the disclosure of all chemicals that are used in these products.
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Affiliation(s)
- Nan Lin
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI 48109, USA
| | - Ning Ding
- Department of Epidemiology, School of Public Health, University of Michigan, Ann Arbor, MI 48109, USA
| | - Emily Meza-Wilson
- College of Literature, Science, and the Arts, University of Michigan, Ann Arbor, MI 48109, USA
| | - Amila Manuradha Devasurendra
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI 48109, USA
| | - Christopher Godwin
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI 48109, USA
| | - Sung Kyun Park
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI 48109, USA; Department of Epidemiology, School of Public Health, University of Michigan, Ann Arbor, MI 48109, USA
| | - Stuart Batterman
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI 48109, USA.
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12
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Brozek JL, Canelo-Aybar C, Akl EA, Bowen JM, Bucher J, Chiu WA, Cronin M, Djulbegovic B, Falavigna M, Guyatt GH, Gordon AA, Hilton Boon M, Hutubessy RCW, Joore MA, Katikireddi V, LaKind J, Langendam M, Manja V, Magnuson K, Mathioudakis AG, Meerpohl J, Mertz D, Mezencev R, Morgan R, Morgano GP, Mustafa R, O'Flaherty M, Patlewicz G, Riva JJ, Posso M, Rooney A, Schlosser PM, Schwartz L, Shemilt I, Tarride JE, Thayer KA, Tsaioun K, Vale L, Wambaugh J, Wignall J, Williams A, Xie F, Zhang Y, Schünemann HJ. GRADE Guidelines 30: the GRADE approach to assessing the certainty of modeled evidence-An overview in the context of health decision-making. J Clin Epidemiol 2020; 129:138-150. [PMID: 32980429 DOI: 10.1016/j.jclinepi.2020.09.018] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 09/08/2020] [Accepted: 09/17/2020] [Indexed: 12/12/2022]
Abstract
OBJECTIVES The objective of the study is to present the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) conceptual approach to the assessment of certainty of evidence from modeling studies (i.e., certainty associated with model outputs). STUDY DESIGN AND SETTING Expert consultations and an international multidisciplinary workshop informed development of a conceptual approach to assessing the certainty of evidence from models within the context of systematic reviews, health technology assessments, and health care decisions. The discussions also clarified selected concepts and terminology used in the GRADE approach and by the modeling community. Feedback from experts in a broad range of modeling and health care disciplines addressed the content validity of the approach. RESULTS Workshop participants agreed that the domains determining the certainty of evidence previously identified in the GRADE approach (risk of bias, indirectness, inconsistency, imprecision, reporting bias, magnitude of an effect, dose-response relation, and the direction of residual confounding) also apply when assessing the certainty of evidence from models. The assessment depends on the nature of model inputs and the model itself and on whether one is evaluating evidence from a single model or multiple models. We propose a framework for selecting the best available evidence from models: 1) developing de novo, a model specific to the situation of interest, 2) identifying an existing model, the outputs of which provide the highest certainty evidence for the situation of interest, either "off-the-shelf" or after adaptation, and 3) using outputs from multiple models. We also present a summary of preferred terminology to facilitate communication among modeling and health care disciplines. CONCLUSION This conceptual GRADE approach provides a framework for using evidence from models in health decision-making and the assessment of certainty of evidence from a model or models. The GRADE Working Group and the modeling community are currently developing the detailed methods and related guidance for assessing specific domains determining the certainty of evidence from models across health care-related disciplines (e.g., therapeutic decision-making, toxicology, environmental health, and health economics).
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Affiliation(s)
- Jan L Brozek
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada; Department of Medicine, McMaster University, Hamilton, Ontario, Canada; McMaster GRADE Centre & Michael DeGroote Cochrane Canada Centre, McMaster University, Hamilton, Ontario, Canada
| | - Carlos Canelo-Aybar
- Department of Paediatrics, Obstetrics and Gynaecology, Preventive Medicine, and Public Health. PhD Programme in Methodology of Biomedical Research and Public Health. Universitat Autònoma de Barcelona, Bellaterra, Spain; Iberoamerican Cochrane Center, Biomedical Research Institute (IIB Sant Pau-CIBERESP), Barcelona, Spain
| | - Elie A Akl
- Department of Internal Medicine, American University of Beirut, Beirut, Lebanon
| | - James M Bowen
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada; Toronto Health Economics and Technology Assessment (THETA) Collaborative, Toronto, Ontario, Canada
| | - John Bucher
- National Toxicology Program, National Institute of Environmental Health Sciences, Durham, NC, USA
| | - Weihsueh A Chiu
- Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, TX, USA
| | - Mark Cronin
- School of Pharmacy and Chemistry, Liverpool John Moores University, Liverpool, UK
| | - Benjamin Djulbegovic
- Center for Evidence-Based Medicine and Health Outcome Research, Morsani College of Medicine, University of South Florida, Tampa, Florida, USA
| | - Maicon Falavigna
- Institute for Education and Research, Hospital Moinhos de Vento, Porto Alegre, Rio Grande do Sul, Brazil
| | - Gordon H Guyatt
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada; Department of Medicine, McMaster University, Hamilton, Ontario, Canada; McMaster GRADE Centre & Michael DeGroote Cochrane Canada Centre, McMaster University, Hamilton, Ontario, Canada
| | | | | | - Raymond C W Hutubessy
- Department of Immunization, Vaccines and Biologicals, World Health Organization, Geneva, Switzerland
| | - Manuela A Joore
- Clinical Epidemiology and Medical Technology Assessment, Maastricht University Medical Centre+, Maastricht, the Netherlands
| | | | - Judy LaKind
- LaKind Associates, LLC, Catonsville, MD, USA; Department of Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Miranda Langendam
- Department of Clinical Epidemiology, Biostatistics, and Bioinformatics, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands
| | - Veena Manja
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada; Department of Surgery, University of California Davis, Sacramento, CA, USA; Department of Medicine, Department of Veterans Affairs, Northern California Health Care System, Mather, CA, USA
| | | | - Alexander G Mathioudakis
- Division of Infection, Immunity and Respiratory Medicine, University Hospital of South Manchester, University of Manchester, Manchester, UK
| | - Joerg Meerpohl
- Institute for Evidence in Medicine, Medical Center, University of Freiburg, Freiburg-am-Breisgau, Germany; Cochrane Germany, Freiburg-am-Breisgau, Germany
| | - Dominik Mertz
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada
| | - Roman Mezencev
- National Center for Environmental Assessment, U.S. Environmental Protection Agency, Washington, DC, USA
| | - Rebecca Morgan
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada
| | - Gian Paolo Morgano
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada; McMaster GRADE Centre & Michael DeGroote Cochrane Canada Centre, McMaster University, Hamilton, Ontario, Canada
| | - Reem Mustafa
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada; Department of Medicine, University of Kansas Medical Center, Kansas City, KS, USA
| | - Martin O'Flaherty
- Institute of Population Health Sciences, University of Liverpool, Liverpool, UK
| | - Grace Patlewicz
- National Center for Computational Toxicology, U.S. Environmental Protection Agency, Durham, NC, USA
| | - John J Riva
- McMaster GRADE Centre & Michael DeGroote Cochrane Canada Centre, McMaster University, Hamilton, Ontario, Canada; Department of Family Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Margarita Posso
- Iberoamerican Cochrane Center, Biomedical Research Institute (IIB Sant Pau-CIBERESP), Barcelona, Spain
| | - Andrew Rooney
- National Toxicology Program, National Institute of Environmental Health Sciences, Durham, NC, USA
| | - Paul M Schlosser
- National Center for Environmental Assessment, U.S. Environmental Protection Agency, Washington, DC, USA
| | - Lisa Schwartz
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada
| | - Ian Shemilt
- EPPI-Centre, Institute of Education, University College London, London, UK
| | - Jean-Eric Tarride
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada; Programs for Assessment of Technology in Health, McMaster University, Hamilton, Ontario, Canada
| | - Kristina A Thayer
- Department of Medicine, Department of Veterans Affairs, Northern California Health Care System, Mather, CA, USA
| | - Katya Tsaioun
- Evidence-Based Toxicology Collaboration, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | - Luke Vale
- Health Economics Group, Institute of Health and Society, Newcastle University, Newcastle upon Tyne, UK
| | - John Wambaugh
- National Center for Computational Toxicology, U.S. Environmental Protection Agency, Durham, NC, USA
| | | | | | - Feng Xie
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada
| | - Yuan Zhang
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada; Health Quality Ontario, Toronto, Ontario, Canada
| | - Holger J Schünemann
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada; Department of Medicine, McMaster University, Hamilton, Ontario, Canada; McMaster GRADE Centre & Michael DeGroote Cochrane Canada Centre, McMaster University, Hamilton, Ontario, Canada
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Gaskin S, Thredgold L, Pisaniello D, Logan M, Baxter C. Is the skin an important exposure route for workers during cyanogen fumigation? PEST MANAGEMENT SCIENCE 2020; 76:1443-1447. [PMID: 31639266 DOI: 10.1002/ps.5657] [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: 05/29/2019] [Revised: 09/16/2019] [Accepted: 10/21/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND Cyanogen is a toxic flammable gas used as a fumigant in numerous industries. Occupational exposure to cyanogen can occur during its production and use. The most serious human health risk from exposure to cyanogen is via the respiratory system. However, there is also potential for skin exposure in many workplace situations. The extent of skin absorption under occupational exposure scenarios has not been directly assessed. Understanding skin uptake potential may inform risk assessment and exposure control measures. RESULTS We describe an in vitro experimental system using human epidermis and dynamic atmosphere exposure to cyanogen to mimic potential workplace exposures. The influence of clothing and ventilation on skin permeation outcomes were also assessed. No evidence of transdermal permeation was found at 100 or 1000 ppm exposures, while permeation of 0.99 ± 0.38 μg cm-2 was observed after 60 min exposure to 10 000 ppm. Fabric on skin and skin ventilation had no additional influence on transdermal permeation compared with naked skin, but fabric provided a reservoir for potential secondary exposures. CONCLUSION Results show dermal uptake following cyanogen exposure is possible, but only at very high atmospheric concentrations (10 000 ppm after >15 min exposure). Importantly, this could have implications for fumigant applicators who may only be wearing personal respiratory protection. These empirical data may be used in conjunction with other relevant toxicological information in determining whether a Skin Notation is warranted for Workplace Exposure Standard setting. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Sharyn Gaskin
- School of Public Health, Adelaide Exposure Science and Health, University of Adelaide, Thebarton, SA, Australia
| | - Leigh Thredgold
- School of Public Health, Adelaide Exposure Science and Health, University of Adelaide, Thebarton, SA, Australia
| | - Dino Pisaniello
- School of Public Health, Adelaide Exposure Science and Health, University of Adelaide, Thebarton, SA, Australia
| | - Michael Logan
- Research and Scientific Branch, Queensland Fire and Emergency Services, Brisbane, QLD, Australia
| | - Christina Baxter
- Department of Defence, Combating Terrorism Technical Support Office, US Government, Alexandria, VA, USA
- Emergency Response TIPS, LLC, Alexandria, VA, USA
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14
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Kasiotis KM, Spaan S, Tsakirakis AN, Franken R, Chartzala I, Anastasiadou P, Machera K, Rother D, Roitzsch M, Poppek U, Lucadei G, Baumgärtel A, Schlüter U, Gerritsen-Ebben RM. Comparison of Measurement Methods for Dermal Exposure to Hazardous Chemicals at the Workplace: The SysDEA Project. Ann Work Expo Health 2019; 64:55-70. [DOI: 10.1093/annweh/wxz085] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 10/04/2019] [Accepted: 11/05/2019] [Indexed: 12/27/2022] Open
Abstract
Abstract
There is a principal need for more precise methodology with regard to the determination of occupational dermal exposure. The goal of the Systematic analysis of Dermal Exposure to hazardous chemical Agents at the workplace project was therefore to generate scientific knowledge to improve and standardize measurement methods for dermal exposure to chemicals at the workplace. In addition, the comparability of different measurement methods was investigated. Different methods (body sampling by means of coveralls and patches, hand sampling by means of gloves and washing, and head sampling by means of headbands and wiping) were compared. Volunteers repeatedly performed a selection of tasks under standardized conditions in test chambers to increase the reproducibility and decrease variability. The selected tasks were pouring, rolling, spraying, and handling of objects immersed in liquid formulations, as well as dumping and handling objects contaminated with powder. For the chemical analysis, the surrogate test substance Tinopal SWN was analyzed by means of a high-performance liquid chromatographic method using a fluorescence detector. Tinopal SWN was either applied as a solid product in its pure form, or as a low and high viscosity liquid containing Tinopal SWN in dissolved form. To compare the sampling methods with patches and coveralls, the exposure values as measured on the patches were extrapolated to the surface areas of the respective parts of the coverall. Based on this extrapolation approach, using the patch method resulted in somewhat higher exposure values compared to using a coverall for all exposure situations, but the differences were only statistically significant in case of the liquid exposure situations. Using gloves resulted in significantly higher exposure values compared to hand wash for handling immersed objects, rolling, and handling contaminated objects, and slightly higher (not significant) exposure values during pouring and spraying. In the same context, applying wipe sampling resulted in higher exposure values than using a headband, which was at least partly due to extrapolation of the wipe results to the surface area of the headband. No ‘golden standard’ with regard to a preferred measurement method for dermal exposure could be identified from the methods as investigated in the current study.
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Affiliation(s)
- Konstantinos M Kasiotis
- Laboratory of Pesticides’ Toxicology, Department of Pesticides Control and Phytopharmacy, Benaki Phytopathological Institute, Kifissia, Athens, Greece
| | - Suzanne Spaan
- Department Risk Analysis for Products in Development (RAPID), TNO, PO, AJ Zeist, The Netherlands
| | - Angelos N Tsakirakis
- Laboratory of Pesticides’ Toxicology, Department of Pesticides Control and Phytopharmacy, Benaki Phytopathological Institute, Kifissia, Athens, Greece
| | - Remy Franken
- Department Risk Analysis for Products in Development (RAPID), TNO, PO, AJ Zeist, The Netherlands
| | - Ilianna Chartzala
- Laboratory of Pesticides’ Toxicology, Department of Pesticides Control and Phytopharmacy, Benaki Phytopathological Institute, Kifissia, Athens, Greece
| | - Pelagia Anastasiadou
- Laboratory of Pesticides’ Toxicology, Department of Pesticides Control and Phytopharmacy, Benaki Phytopathological Institute, Kifissia, Athens, Greece
| | - Kyriaki Machera
- Laboratory of Pesticides’ Toxicology, Department of Pesticides Control and Phytopharmacy, Benaki Phytopathological Institute, Kifissia, Athens, Greece
| | - Dag Rother
- Federal Institute for Occupational Safety and Health, BAuA, Friedrich-Henkel-Weg, Dortmund, Germany
| | - Michael Roitzsch
- Federal Institute for Occupational Safety and Health, BAuA, Friedrich-Henkel-Weg, Dortmund, Germany
| | - Ulrich Poppek
- Federal Institute for Occupational Safety and Health, BAuA, Friedrich-Henkel-Weg, Dortmund, Germany
| | - Gianna Lucadei
- Federal Institute for Occupational Safety and Health, BAuA, Friedrich-Henkel-Weg, Dortmund, Germany
| | - Anja Baumgärtel
- Federal Institute for Occupational Safety and Health, BAuA, Friedrich-Henkel-Weg, Dortmund, Germany
| | - Urs Schlüter
- Federal Institute for Occupational Safety and Health, BAuA, Friedrich-Henkel-Weg, Dortmund, Germany
| | - Rianda M Gerritsen-Ebben
- Department Risk Analysis for Products in Development (RAPID), TNO, PO, AJ Zeist, The Netherlands
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15
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Thredgold L, Gaskin S, Quy C, Pisaniello D. Exposure of Agriculture Workers to Pesticides: The Effect of Heat on Protective Glove Performance and Skin Exposure to Dichlorvos. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2019; 16:ijerph16234798. [PMID: 31795387 PMCID: PMC6926567 DOI: 10.3390/ijerph16234798] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 11/26/2019] [Accepted: 11/26/2019] [Indexed: 12/14/2022]
Abstract
Dichlorvos is a toxic organophosphate insecticide that is used in agriculture and other insecticide applications. Dermal uptake is a known exposure route for dichlorvos and chemical protective gloves are commonly utilized. Chemical handling and application may occur in a variety of thermal environments, and the rates of both chemical permeation through gloves and transdermal penetration may vary significantly with temperature. There has been no published research on the temperature-dependent kinetics of these processes for dichlorvos and thus, this study reports on the effects of hot conditions for the concentrated and application strength chemical. Dichlorvos breakthrough times for non-disposable polyvinyl chloride (PVC) gloves at 60 °C were approximately halved compared to 25 °C for the concentrate (2 vs. 4 h) and more than halved at application strength (3 vs. >8 h). From permeation experiments covering 15–60 °C, there was a 460-fold increase in cumulative permeation over 8 h for the concentrated dichlorvos and the estimated activation energy halved. Elevated temperature was also shown to be a significant factor for human skin penetration increasing the cumulative penetration of concentrate dichlorvos from 179 ± 37 to 1315 ± 362 µg/cm2 (p = 0.0032) and application strength from 29.8 ± 5.7 to 115 ± 19 µg/cm2 (p = 0.0131). This work illustrates the important role temperature plays in glove performance and health risk via dermal exposure. As such, it is important to consider in-use conditions of temperature when implementing chemical hygiene programs.
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Affiliation(s)
- Leigh Thredgold
- Adelaide Exposure Science and Health, School of Public Health, University of Adelaide, Adelaide, South Australia 5000, Australia
- Correspondence:
| | - Sharyn Gaskin
- Adelaide Exposure Science and Health, School of Public Health, University of Adelaide, Adelaide, South Australia 5000, Australia
| | - Chloe Quy
- Adelaide Exposure Science and Health, School of Public Health, University of Adelaide, Adelaide, South Australia 5000, Australia
- AgroParisTech, Paris Institute of Technology for Life, Food and Environmental Sciences, 75231 Paris, France
| | - Dino Pisaniello
- Adelaide Exposure Science and Health, School of Public Health, University of Adelaide, Adelaide, South Australia 5000, Australia
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16
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Eleftheriadou D, Luette S, Kneuer C. In silico prediction of dermal absorption of pesticides - an evaluation of selected models against results from in vitro testing. SAR AND QSAR IN ENVIRONMENTAL RESEARCH 2019; 30:561-585. [PMID: 31535949 DOI: 10.1080/1062936x.2019.1644533] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Accepted: 07/13/2019] [Indexed: 06/10/2023]
Abstract
Current guidance for the estimation of dermal absorption (DA) of pesticides recommends the use of default values, read-across of information between formulations and in vitro testing. While QSARs exist to estimate percutaneous absorption, their use is currently not encouraged. Therefore, the potential of publicly available models for DA estimation was investigated based on data from 564 human in vitro DA experiments on pesticides. The classic Potts Guy model, the correction of Cleek Bunge for highly lipophilic chemicals, the mechanistic model of Mitragotri, and the COSMOS model were used to estimate the permeability coefficient kp. Different approaches were explored to calculate the percentage of external dose absorbed. IH SkinPerm was examined as stand-alone model. The models generally failed to accurately predict experimental values. For 30-40% of the predictions, there was overestimation by one order of magnitude. Three models underpredicted >10% of the cases, the remaining models <5%. DA of hydrophilic substances was typically underpredicted. Overprediction was more prominent for solid preparations and suspensions. The molecular weight, irritation potential and skin thickness did not correlate with the models' predictivity. Of the models investigated, IH SkinPerm performed best with 38% of the predictions within one order of magnitude and 2% underpredicted cases.
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Affiliation(s)
- D Eleftheriadou
- Department for Pesticide Safety, German Federal Institute for Risk Assessment , Berlin , Germany
| | - S Luette
- Department for Pesticide Safety, German Federal Institute for Risk Assessment , Berlin , Germany
| | - C Kneuer
- Department for Pesticide Safety, German Federal Institute for Risk Assessment , Berlin , Germany
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17
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Oerlemans A, Verscheijden LFM, Mol JGJ, Vermeulen RCH, Westerhout J, Roeleveld N, Russel FGM, Scheepers PTJ. Toxicokinetics of a urinary metabolite of tebuconazole following controlled oral and dermal administration in human volunteers. Arch Toxicol 2019; 93:2545-2553. [DOI: 10.1007/s00204-019-02523-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Accepted: 07/18/2019] [Indexed: 01/30/2023]
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18
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Keurentjes AJ, Maibach HI. Percutaneous penetration of drugs applied in transdermal delivery systems: an in vivo based approach for evaluating computer generated penetration models. Regul Toxicol Pharmacol 2019; 108:104428. [PMID: 31326435 DOI: 10.1016/j.yrtph.2019.104428] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Revised: 06/28/2019] [Accepted: 07/16/2019] [Indexed: 01/09/2023]
Abstract
Human skin is a viable pathway for administration of therapeutics. Transdermal delivery systems (TDS) have been approved by the US-FDA since 1981. To enable the risk assessment of dermal exposure, predictive mathematical models are used. In this work the accuracy of predicted flux of the models is compared to experimental human in vivo data of drugs applied in US-FDA approved TDS. A database of pharmacokinetic data of drugs applied in TDS was used and updated. Three mathematical models (QSAR) were used to calculate predicted fluxes, and compared to the human in vivo data. For more than half of the drugs applied in TDS, the predicted flux by the mathematical models was an underestimation compared to the flux calculated with the experimental in vivo data. The flux was over- or underestimated by a factor 10-100. All mathematical models were significantly correlated with the experimental in vivo data. The process of percutaneous penetration has several influencing factors, TDS minimize some of these factors. Limitations are discussed. Further research is needed, with a focus on validation and standardization of the permeability coefficient. This work offers observations that should give a stimulus for refinement on the appropriate usage and limitations of mathematical models.
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Affiliation(s)
- Anne J Keurentjes
- Department of Dermatology, Maibach Laboratory, University of California, San Francisco, 2340 Sutter Street, San Francisco, CA, 94115, USA.
| | - Howard I Maibach
- Department of Dermatology, Maibach Laboratory, University of California, San Francisco, 2340 Sutter Street, San Francisco, CA, 94115, USA.
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19
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LaKind JS, O'Mahony C, Armstrong T, Tibaldi R, Blount BC, Naiman DQ. ExpoQual: Evaluating measured and modeled human exposure data. ENVIRONMENTAL RESEARCH 2019; 171:302-312. [PMID: 30708234 DOI: 10.1016/j.envres.2019.01.039] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Revised: 01/22/2019] [Accepted: 01/24/2019] [Indexed: 06/09/2023]
Abstract
Recent rapid technological advances are producing exposure data sets for which there are no available data quality assessment tools. At the same time, regulatory agencies are moving in the direction of data quality assessment for environmental risk assessment and decision-making. A transparent and systematic approach to evaluating exposure data will aid in those efforts. Any approach to assessing data quality must consider the level of quality needed for the ultimate use of the data. While various fields have developed approaches to assess data quality, there is as yet no general, user-friendly approach to assess both measured and modeled data in the context of a fit-for-purpose risk assessment. Here we describe ExpoQual, an instrument developed for this purpose which applies recognized parameters and exposure data quality elements from existing approaches for assessing exposure data quality. Broad data streams such as quantitative measured and modeled human exposure data as well as newer and developing approaches can be evaluated. The key strength of ExpoQual is that it facilitates a structured, reproducible and transparent approach to exposure data quality evaluation and provides for an explicit fit-for-purpose determination. ExpoQual was designed to minimize subjectivity and to include transparency in aspects based on professional judgment. ExpoQual is freely available on-line for testing and user feedback (exposurequality.com).
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Affiliation(s)
- Judy S LaKind
- LaKind Associates, LLC, Department of Epidemiology and Public Health, University of Maryland School of Medicine, 106 Oakdale Ave, Catonsville, MD 21228, USA
| | - Cian O'Mahony
- Creme Global, Trinity Technology and Enterprise Campus, Grand Canal Quay, Dublin 2, Ireland, UK.
| | - Thomas Armstrong
- TWA8HR Occupational Hygiene Consulting LLC, Branchburg, NJ 08876, USA
| | - Rosalie Tibaldi
- ExxonMobil Biomedical Sciences, Inc., Annandale, NJ 08801, USA.
| | - Benjamin C Blount
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention (CDC), 4770 Buford Highway, NE, Atlanta, GA, USA.
| | - Daniel Q Naiman
- Department of Applied Mathematics & Statistics, The Johns Hopkins University, 3400N. Charles Street, Baltimore, MD 21218, USA.
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20
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Li L, Westgate JN, Hughes L, Zhang X, Givehchi B, Toose L, Armitage JM, Wania F, Egeghy P, Arnot JA. A Model for Risk-Based Screening and Prioritization of Human Exposure to Chemicals from Near-Field Sources. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:14235-14244. [PMID: 30407800 PMCID: PMC6652188 DOI: 10.1021/acs.est.8b04059] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Exposure- and risk-based assessments for chemicals used indoors or applied to humans (i.e., in near-field environments) necessitate an aggregate exposure pathway framework that aligns chemical exposure information from use sources to internal dose and eventually to their potential for health effects. Such a source-to-effect continuum is advocated to balance the complexity of human exposure and the insufficiency of relevant data for thousands of existing and emerging chemicals. Here, we introduce the Risk Assessment, IDentification And Ranking-Indoor and Consumer Exposure (RAIDAR-ICE) model, which establishes an integrated framework to evaluate human exposure due to indoor use and direct application of chemicals to humans. As a model evaluation, RAIDAR-ICE faithfully reproduces exposure estimates inferred from biomonitoring data for 37 chemicals with direct and indirect near-field sources. RAIDAR-ICE generates different rankings for 131 chemicals based on different exposure- and risk-based assessment metrics, demonstrating its versatility for diverse chemical screening goals. When coupled with a far-field RAIDAR model, the near-field RAIDAR-ICE model enables assessment of aggregate human exposure. Overall, RAIDAR-ICE is a powerful tool for high-throughput screening and prioritization of human exposure to neutral organic chemicals used indoors.
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Affiliation(s)
- Li Li
- Department of Physical and Environmental Sciences, University of Toronto Scarborough, Toronto, ON, Canada
| | | | - Lauren Hughes
- ARC Arnot Research and Consulting Inc., Toronto, ON, Canada
| | - Xianming Zhang
- ARC Arnot Research and Consulting Inc., Toronto, ON, Canada
| | - Babak Givehchi
- ARC Arnot Research and Consulting Inc., Toronto, ON, Canada
| | - Liisa Toose
- ARC Arnot Research and Consulting Inc., Toronto, ON, Canada
| | | | - Frank Wania
- Department of Physical and Environmental Sciences, University of Toronto Scarborough, Toronto, ON, Canada
| | - Peter Egeghy
- Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, NC, United States
| | - Jon A. Arnot
- Department of Physical and Environmental Sciences, University of Toronto Scarborough, Toronto, ON, Canada
- ARC Arnot Research and Consulting Inc., Toronto, ON, Canada
- Department of Pharmacology and Toxicology, University of Toronto, ON, Canada
- Corresponding author: Arnot, J. A., 36 Sproat Avenue, Toronto, Ontario, M4M 1W4, Tel: +1 (647) 225-3771;
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Gaskin S, Thredgold L, Heath L, Pisaniello D, Logan M, Baxter C. Empirical data in support of a skin notation for methyl chloride. JOURNAL OF OCCUPATIONAL AND ENVIRONMENTAL HYGIENE 2018; 15:569-572. [PMID: 29708856 DOI: 10.1080/15459624.2018.1470636] [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: 02/09/2018] [Revised: 04/12/2018] [Accepted: 04/24/2018] [Indexed: 06/08/2023]
Abstract
This article presents the first empirical experimental data on the skin absorption of methyl chloride gas using an in vitro technique and human skin. Methyl chloride is a commonly used industrial agent that is known to be an inhalational hazard but is also reported to be absorbed through human skin in amounts that contribute substantially to systemic intoxication. As a result, is has been assigned a skin notation by the ACGIH. Other than predictive models, there is a general paucity of experimental data on the skin absorption of methyl chloride and therefore a distinct lack of empirical evidence in the open literature to support the assignment of a skin notation for this chemical. This study found that methyl chloride permeates through human epidermis when exposed at high atmospheric concentrations within relatively short timeframes. Therefore, providing important initial empirical evidence in support of the assignment of a skin notation.
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Affiliation(s)
- Sharyn Gaskin
- a School of Public Health , University of Adelaide , Adelaide , South Australia , Australia
| | - Leigh Thredgold
- a School of Public Health , University of Adelaide , Adelaide , South Australia , Australia
| | - Linda Heath
- a School of Public Health , University of Adelaide , Adelaide , South Australia , Australia
| | - Dino Pisaniello
- a School of Public Health , University of Adelaide , Adelaide , South Australia , Australia
| | - Michael Logan
- b Research and Scientific Branch , Queensland Fire and Emergency Services , Queensland , Australia
| | - Christina Baxter
- c Department of Defense , Technical Support Working Group, Combating Terrorism Technical Support Office, US Government , Arlington, Virginia
- d Emergency Response TIPS, LLC , Woodbridge , Virginia
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22
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Cherrie JW. How to Quantitatively Assess Dermal Exposure to Volatile Organic Compounds. Ann Work Expo Health 2018; 62:253-254. [PMID: 29293869 DOI: 10.1093/annweh/wxx098] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- John W Cherrie
- Institute of Biological Chemistry, Biophysics and Bioengineering, Heriot Watt University and the Institute of Occupational Medicine, Edinburgh, UK
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23
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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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24
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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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25
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Gorman Ng M, Milon A, Vernez D, Lavoué J. A Web-based Tool to Aid the Identification of Chemicals Potentially Posing a Health Risk through Percutaneous Exposure. ANNALS OF OCCUPATIONAL HYGIENE 2015; 60:276-89. [PMID: 26721263 DOI: 10.1093/annhyg/mev091] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Accepted: 11/25/2015] [Indexed: 12/30/2022]
Abstract
Occupational hygiene practitioners typically assess the risk posed by occupational exposure by comparing exposure measurements to regulatory occupational exposure limits (OELs). In most jurisdictions, OELs are only available for exposure by the inhalation pathway. Skin notations are used to indicate substances for which dermal exposure may lead to health effects. However, these notations are either present or absent and provide no indication of acceptable levels of exposure. Furthermore, the methodology and framework for assigning skin notation differ widely across jurisdictions resulting in inconsistencies in the substances that carry notations. The UPERCUT tool was developed in response to these limitations. It helps occupational health stakeholders to assess the hazard associated with dermal exposure to chemicals. UPERCUT integrates dermal quantitative structure-activity relationships (QSARs) and toxicological data to provide users with a skin hazard index called the dermal hazard ratio (DHR) for the substance and scenario of interest. The DHR is the ratio between the estimated 'received' dose and the 'acceptable' dose. The 'received' dose is estimated using physico-chemical data and information on the exposure scenario provided by the user (body parts exposure and exposure duration), and the 'acceptable' dose is estimated using inhalation OELs and toxicological data. The uncertainty surrounding the DHR is estimated with Monte Carlo simulation. Additional information on the selected substances includes intrinsic skin permeation potential of the substance and the existence of skin notations. UPERCUT is the only available tool that estimates the absorbed dose and compares this to an acceptable dose. In the absence of dermal OELs it provides a systematic and simple approach for screening dermal exposure scenarios for 1686 substances.
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Affiliation(s)
- Melanie Gorman Ng
- University of Montréal Hospital Research Centre, Montréal, Québec H2X 0A9, Canada
| | - Antoine Milon
- Institute for Work and Health, University of Lausanne and Geneva, Lausanne 1066, Switzerland
| | - David Vernez
- Institute for Work and Health, University of Lausanne and Geneva, Lausanne 1066, Switzerland
| | - Jérôme Lavoué
- University of Montréal Hospital Research Centre, Montréal, Québec H2X 0A9, Canada;
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26
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Rosenbaum RK, Meijer A, Demou E, Hellweg S, Jolliet O, Lam NL, Margni M, McKone TE. Indoor Air Pollutant Exposure for Life Cycle Assessment: Regional Health Impact Factors for Households. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:12823-31. [PMID: 26444519 DOI: 10.1021/acs.est.5b00890] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Human exposure to indoor pollutant concentrations is receiving increasing interest in Life Cycle Assessment (LCA). We address this issue by incorporating an indoor compartment into the USEtox model, as well as by providing recommended parameter values for households in four different regions of the world differing geographically, economically, and socially. With these parameter values, intake fractions and comparative toxicity potentials for indoor emissions of dwellings for different air tightness levels were calculated. The resulting intake fractions for indoor exposure vary by 2 orders of magnitude, due to the variability of ventilation rate, building occupation, and volume. To compare health impacts as a result of indoor exposure with those from outdoor exposure, the indoor exposure characterization factors determined with the modified USEtox model were applied in a case study on cooking in non-OECD countries. This study demonstrates the appropriateness and significance of integrating indoor environments into LCA, which ensures a more holistic account of all exposure environments and allows for a better accountability of health impacts. The model, intake fractions, and characterization factors are made available for use in standard LCA studies via www.usetox.org and in standard LCA software.
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Affiliation(s)
- Ralph K Rosenbaum
- Irstea, UMR ITAP, ELSA Research group & ELSA-PACT-Industrial Chair for Environmental and Social Sustainability Assessment, 361 rue J.F. Breton, 5095, 34196 Montpellier, France
- Division for Quantitative Sustainability Assessment, Department of Management Engineering, Technical University of Denmark , 2800 Kgs. Lyngby, Denmark
| | - Arjen Meijer
- OTB Research for the Built Environment, Faculty of Architecture and the Built Environment, Delft University of Technology , 2600 GA Delft, The Netherlands
| | - Evangelia Demou
- Healthy Working Lives Group, Institute of Health and Wellbeing, College of Medical, Veterinary and Life Sciences, University of Glasgow , Glasgow G12 8RZ, U.K
- MRC/CSO Social and Public Health Sciences Unit, University of Glasgow , Glasgow G2 3QB, U.K
| | - Stefanie Hellweg
- Institute of Environmental Engineering, ETH Zurich , 8093 Zurich, Switzerland
| | - Olivier Jolliet
- Environmental Health Sciences, School of Public Health, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Nicholas L Lam
- School of Public Health, University of California Berkeley , Berkeley, California 94720, United States
| | - Manuele Margni
- Department of Mathematical and Industrial Engineering, CIRAIG - Polytechnique Montreal , Montreal, Quebec H3C 3A7, Canada
| | - Thomas E McKone
- School of Public Health, University of California Berkeley , Berkeley, California 94720, United States
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27
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Jolliet O, Ernstoff AS, Csiszar SA, Fantke P. Defining Product Intake Fraction to Quantify and Compare Exposure to Consumer Products. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:8924-31. [PMID: 26102159 DOI: 10.1021/acs.est.5b01083] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
There is a growing consciousness that exposure studies need to better cover near-field exposure associated with products use. To consistently and quantitatively compare human exposure to chemicals in consumer products, we introduce the concept of product intake fraction, as the fraction of a chemical within a product that is eventually taken in by the human population. This metric enables consistent comparison of exposures during consumer product use for different product-chemical combinations, exposure duration, exposure routes and pathways and for other life cycle stages. We present example applications of the product intake fraction concept, for two chemicals in two personal care products and two chemicals encapsulated in two articles, showing how intakes of these chemicals can primarily occur during product use. We demonstrate the utility of the product intake fraction and its application modalities within life cycle assessment and risk assessment contexts. The product intake fraction helps to provide a clear interface between the life cycle inventory and impact assessment phases, to identify best suited sentinel products and to calculate overall exposure to chemicals in consumer products, or back-calculate maximum allowable concentrations of substances inside products.
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Affiliation(s)
| | - Alexi S Ernstoff
- ‡Quantitative Sustainability Assessment Division, Department of Management Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | | | - Peter Fantke
- ‡Quantitative Sustainability Assessment Division, Department of Management Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
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28
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Gong M, Zhang Y, Weschler CJ. Predicting dermal absorption of gas-phase chemicals: transient model development, evaluation, and application. INDOOR AIR 2014; 24:292-306. [PMID: 24245588 DOI: 10.1111/ina.12079] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2013] [Accepted: 11/13/2013] [Indexed: 05/27/2023]
Abstract
UNLABELLED A transient model is developed to predict dermal absorption of gas-phase chemicals via direct air-to-skin-to-blood transport under non-steady-state conditions. It differs from published models in that it considers convective mass-transfer resistance in the boundary layer of air adjacent to the skin. Results calculated with this transient model are in good agreement with the limited experimental results that are available for comparison. The sensitivity of the modeled estimates to key parameters is examined. The model is then used to estimate air-to-skin-to-blood absorption of six phthalate esters for scenarios in which (A) a previously unexposed occupant encounters gas-phase phthalates in three different environments over a single 24-h period; (B) the same as 'A', but the pattern is repeated for seven consecutive days. In the 24-h scenario, the transient model predicts more phthalate absorbed into skin and less absorbed into blood than would a steady-state model. In the 7-day scenario, results calculated by the transient and steady-state models converge over a time period that varies between 3 and 4 days for all but the largest phthalate (DEHP). Dermal intake is comparable to or larger than inhalation intake for DEP, DiBP, DnBP, and BBzP in Scenario 'A' and for all six phthalates in Scenario 'B'. PRACTICAL IMPLICATIONS Dermal absorption from air has often been overlooked in exposure assessments. However, our transient model suggests that dermal intake of certain gas-phase phthalate esters is comparable to, or larger than, inhalation intake under commonly occurring indoor conditions. This may also be the case for other organic chemicals that have physicochemical properties that favor dermal absorption directly from air. Consequently, this pathway should be included in aggregate exposure and risk assessments. Furthermore, under conditions where the exposure concentrations are changing or there is insufficient time to achieve steady-state, the transient model presented in this study is more appropriate for estimating dermal absorption than is a steady-state model.
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Affiliation(s)
- M Gong
- Department of Building Science, Tsinghua University, Beijing, China
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29
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Weschler CJ, Nazaroff WW. Dermal uptake of organic vapors commonly found in indoor air. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:1230-7. [PMID: 24328315 DOI: 10.1021/es405490a] [Citation(s) in RCA: 127] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Transdermal uptake directly from air is a potentially important yet largely overlooked pathway for human exposure to organic vapors indoors. We recently reported (Indoor Air 2012, 22, 356) that transdermal uptake directly from air could be comparable to or larger than intake via inhalation for many semivolatile organic compounds (SVOCs). Here, we extend that analysis to approximately eighty organic compounds that (a) occur commonly indoors and (b) are primarily in the gas-phase rather than being associated with particles. For some compounds, the modeled ratio of dermal-to-inhalation uptake is large. In this group are common parabens, lower molecular weight phthalates, o-phenylphenol, Texanol, ethylene glycol, and α-terpineol. For other compounds, estimated dermal uptakes are small compared to inhalation. Examples include aliphatic hydrocarbons, single ring aromatics, terpenes, chlorinated solvents, formaldehyde, and acrolein. Analysis of published experimental data for human subjects for twenty different organic compounds substantiates these model predictions. However, transdermal uptake rates from air have not been measured for the indoor organics that have the largest modeled ratios of dermal-to-inhalation uptake; for such compounds, the estimates reported here require experimental verification. In accounting for total exposure to indoor organic pollutants and in assessing potential health consequences of such exposures, it is important to consider direct transdermal absorption from air.
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Affiliation(s)
- Charles J Weschler
- Environmental and Occupational Health Sciences Institute, Rutgers University , Piscataway, New Jersey 08854, United States
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