4.8 Article

Coupled near-field and far-field exposure assessment framework for chemicals in consumer products

期刊

ENVIRONMENT INTERNATIONAL
卷 94, 期 -, 页码 508-518

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envint.2016.06.010

关键词

Near-field consumer exposure; Multimedia multi-pathway framework; Product intake fraction; Life cycle impact assessment; Chemical alternatives assessment; High-throughput risk screening

资金

  1. European Commission under the Seventh Framework Programme [631910, 285286]
  2. U.S. EPA on Development of Modular Risk Pathway Descriptions for Life Cycle Assessment [EP-14-C-000115]
  3. Long Range Research Initiative of the American Chemistry Council [MTH1001-01]
  4. U.S. Department of Energy [DW-89-92298301]
  5. U.S. EPA [DW-89-92298301]

向作者/读者索取更多资源

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 (C) 2016 The Authors. Published by Elsevier Ltd.

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