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Dose reconstruction in workers exposed to two major pyrethroid pesticides and determination of biological reference values using a toxicokinetic model

Journal of Exposure Science & Environmental Epidemiology volume 28, pages 599–614 (2018)Cite this article

Abstract

A toxicokinetic model has been optimized to describe the time profiles of common biomarkers of exposure to permethrin and cypermethrin: trans-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropane-1-carboxylic acids (trans-DCCA) and 3-phenoxybenzoic acid (3-PBA). The model then served to reproduce urinary time courses in exposed agricultural workers and predict corresponding absorbed doses. It allowed for the prediction of the main routes of exposure in workers during the study period. Modeling showed that simulating exposure mostly by the oral route, during the 3-day biomonitoring period, provided best-fits to the urinary time courses of most workers. This is compatible with an inadvertent oral exposure during work. According to best-fit scenarios, absorbed doses in workers reconstructed with the model reached a maximum of 2.4 µg/kg bw/day and were below the absorbed dose limits associated with an exposure to the reference dose values established by the U.S. Environmental Protection Agency (0.06 and 0.25 mg/kg bw/day for cypermethrin and permethrin, respectively) and the Acceptable Operator Exposure Level set by the European Commission (0.06 mg/kg bw/day for cypermethrin). Modeling was further used to derive biological reference values for cypermethrin and permethrin exposure. Respective values of 7 and 29 nmol/kg bw/day of trans-DCCA, and 3 and 13 nmol/kg bw/day of 3-PBA were obtained. None of the workers presented values above these biological reference values.

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Acknowledgements

The study was funded by the Institut de recherche Robert-Sauvé en santé et sécurité du travail du Québec (IRSST).

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  1. Department of Environmental and Occupational Health, Chair in Toxicological Risk Assessment and Management, and University of Montreal Public Health Research Institute (IRSPUM), University of Montreal, Roger-Gaudry Building, U424, Main Station, P.O. Box 6128, Montreal, QB, H3C 3J7, Canada

    Jonathan Côté & Michèle Bouchard

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Correspondence to Michèle Bouchard.

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Côté, J., Bouchard, M. Dose reconstruction in workers exposed to two major pyrethroid pesticides and determination of biological reference values using a toxicokinetic model. J Expo Sci Environ Epidemiol 28, 599–614 (2018). https://doi.org/10.1038/s41370-017-0004-y

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