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Pesticides in surface freshwater: a critical review

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Abstract

The objective of this study was to critically review studies published up to November 2021 that investigated the presence of pesticides in surface freshwater to answer three questions: (1) in which countries were the studies conducted? (2) which pesticides are most evaluated and detected? and (3) which pesticides have the highest concentrations? Using the Prisma protocol, 146 articles published from 1976 to November 2021 were included in this analysis: 127 studies used grab sampling, 10 used passive sampling, and 9 used both sampling techniques. In the 45-year historical series, the USA, China, and Spain were the countries that conducted the highest number of studies. Atrazine was the most evaluated pesticide (56% of the studies), detected in 43% of the studies using grab sampling, and the most detected in passive sampling studies (68%). The compounds with the highest maximum and mean concentrations in the grab sampling were molinate (211.38 µg/L) and bentazone (53 µg/L), respectively, and in passive sampling, they were oxyfluorfen (16.8 µg/L) and atrazine (4.8 μg/L), respectively. The levels found for atrazine, p,p′-DDD, and heptachlor in Brazil were higher than the regulatory levels for superficial water in the country. The concentrations exceeded the toxicological endpoint for at least 11 pesticides, including atrazine (Daphnia LC50 and fish NOAEC), cypermethrin (algae EC50, Daphnia and fish LC50; fish NOAEC), and chlorpyrifos (Daphnia and fish LC50; fish NOAEC). These results can be used for planning pesticide monitoring programs in surface freshwater, at regional and global levels, and for establishing or updating water quality regulations.

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Acknowledgements

We would like to thank Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) for the scholarship (no. 88882.384507/2019-01) granted to the first author.

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EPA and ECOF designed the study and reviewed the articles included in the review. EPA wrote the first draft of the manuscript, which was reviewed by ECOF and EDC. All authors approved the final version of the article.

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Correspondence to Esmeralda Pereira de Araújo or Eduardo Cyrino Oliveira-Filho.

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The authors declare no competing interests.

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de Araújo, E.P., Caldas, E.D. & Oliveira-Filho, E.C. Pesticides in surface freshwater: a critical review. Environ Monit Assess 194, 452 (2022). https://doi.org/10.1007/s10661-022-10005-y

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  • DOI: https://doi.org/10.1007/s10661-022-10005-y

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