Abstract
There are limited literature data on the impact of coexposure on the toxicokinetics of pesticides in agricultural workers. Using the largely employed pyrethroid lambda-cyhalothrin (LCT) and fungicide captan as sentinel pesticides, we compared individual temporal profiles of biomarkers of exposure to LCT in strawberry field workers following an application episode of LCT alone or in coexposure with captan. Participants provided all urine voided over a 3-day period after an application of a pesticide formulation containing LCT alone (E1) or LCT mixed with captan (E2), and in some cases following re-entry in treated field (E3). Pyrethroid metabolites were measured in all urine samples, in particular 3-(2-chloro-3,3,3-trifluoroprop-1-en-1-yl)-2,2-dimethyl-cyclopropanecarboxylic acid (CFMP), 3-phenoxybenzoic acid (3-PBA), and 4-hydroxy-3-phenoxybenzoic acid (4-OH3PBA). There were no obvious differences in individual concentration–time profiles and cumulative excretion of metabolites (CFMP, 3-PBA, 4-OH3BPA) after exposure to LCT alone or in combination with captan. For most workers and exposure scenarios, CFMP was the main metabolite excreted, but time courses of CFMP in urine did not always follow that of 3-PBA and 4-OH3BPA. Given that the latter metabolites are common to other pyrethroids, this suggests that some workers were coexposed to pyrethroids other than LCT. For several workers and exposure scenarios E1 and E2, values of CFMP increased in the hours following spraying. However, for many pesticide operators, other peaks of CFMP were observed at later times, indicating that tasks other than spraying of LCT-containing formulations contributed to this increased exposure. These tasks were mainly handling/cleaning of equipment used for spraying (tractor or sprayer) or work/inspection in LCT-treated field according to questionnaire responses. Overall, this study provided novel excretion time course data for LCT metabolites valuable for interpretation of biomonitoring data in workers, but also showed that coexposure was not a major determinant of variability in exposure biomarker levels. Our analysis also pointed out the importance of measuring specific metabolites.
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All data generated during this study are included in this article or are available on reasonable request from the corresponding author.
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This work was funded by the Institut de recherche Robert-Sauvé en santé et sécurité du travail du Québec (IRSST) (Award number: 2016-0003).
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YMB: methodology, formal analysis, investigation, and writing—original draft preparation. JC: formal analysis, investigation, and writing—reviewing and editing. LM: methodology, formal analysis, and writing—reviewing and editing. MM: formal analysis, investigation, and writing—reviewing and editing. NEM: methodology and writing—reviewing and editing. AF: methodology, formal analysis, and writing—reviewing and editing. MB: conceptualization, methodology, formal analysis, supervision, project management, writing—original draft preparation, writing—reviewing and editing, and funding acquisition.
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Bossou, Y.M., Côté, J., Mahrouche, L. et al. Excretion time courses of lambda-cyhalothrin metabolites in the urine of strawberry farmworkers and effect of coexposure with captan. Arch Toxicol 96, 2465–2486 (2022). https://doi.org/10.1007/s00204-022-03310-5
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DOI: https://doi.org/10.1007/s00204-022-03310-5