Water vulnerability to pesticide contamination in a Brazilian semiarid watershed.

Autor: Francelino, John W. C.1 (AUTHOR), de Azevedo, Francisco R.1 (AUTHOR), de Oliveira, André Henrique B.2 (AUTHOR), Menezes, Jorge M. C.3 (AUTHOR), de Paula Filho, Francisco J.3 (AUTHOR) francisco.filho@ufca.edu.br
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Zdroj: Integrated Environmental Assessment & Management. May2023, Vol. 19 Issue 3, p804-816. 13p.
Abstrakt: This study aimed to prepare an inventory of the main active ingredients of pesticides and estimate the risk of pollution of groundwater and surface water resources in a Brazilian semiarid basin. The inventory was prepared using data from government agency databases. The contamination risk estimate was obtained using the GOSS index, Groundwater Ubiquity Score (GUS), Groundwater Screening Index (GSI), Leachability Index (LIX), US Environmental Protection Agency (USEPA) criteria, Leaching Index (LEACH), and Relative Leaching Potential Index (RLPI). The inventory identified 57 active ingredients commercialized under a well‐defined chemical class. Most of these (51.5%) belong to the very dangerous class, while 43.6% belong to the moderately toxic class. The GOSS model showed that 23.7% of the active ingredients have a low potential, 50.85% have a moderate potential, and 13.56% have a high potential for surface water contamination, with its transport being associated with the sediment. The GUS index indicates a low potential for groundwater contamination. However, the GSI points to a high potential for water contamination, the USEPA criteria for a possible contamination of groundwater, and, according to the LIX, most of the pollutants do so by leaching. The information provided contributes to the management of xenobiotic compounds in arid and semiarid basins, adding to the water security effort by providing tools for the assessment of potential pesticide pollution. Integr Environ Assess Manag 2023;19:804–816. © 2022 SETAC Key Points: This study uses indices available in the literature for pesticides that are in use in the semiarid basin of the Salgado River in Northeastern Brazil.The study was carried out with the objective of identifying the pesticides that should be included by public managers in groundwater monitoring programs.The study contributes to the management of xenobiotic compounds in semiarid basins.In the study, 46% of the active ingredients were classified as highly to extremely toxic. [ABSTRACT FROM AUTHOR]
Databáze: GreenFILE
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