期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 788, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.147715
关键词
Pesticides; Water quality; Agricultural watershed; Pond mitigation; Transformation products; Small waterbodies
资金
- Rhin-Meuse Water Agency
- French Agency for Food, Environmental and Occupational Health Safety (ANSES)
In France, over 90% of monitored watercourses are contaminated with pesticides, with higher contamination levels at the head of agricultural watersheds. Ponds play a crucial role in reducing pesticide concentrations, but pesticide transformation products may also contribute to environmental degradation.
In France, more than 90% of monitored watercourses are contaminated with pesticides. This high contamination level increases at the head of agricultural watersheds, where dilution capacities are low and transport from treated lands is direct. Ponds, numerous around headwater streams, could provide additional protection against pesticide pollution. Because of their long hydraulic residence time and large water volumes, they mitigate pesticide concentrations between upstream and downstream rivers. However, pesticide transformation products may also be responsible for the degradation of environments, owing to their presence at high concentrations and their persistence, but related data are scarce, particularly because of their high level of molecular diversity. We first reported on the state of water contamination in agricultural headwater streams, based on high frequency water sampling. Analysis of 67 molecules (HPLC-ESI-MS/MS) showed pesticides and pesticide transformation product mixtures of up to 29 different compounds in one sample. Regardless of the sampling location, transformation products represented at least 50% of the detected compounds. Then, we demonstrated the capacity of a pond to reduce contaminant concentrations in downstream rivers for 90% of the detected compounds. Upstream from this pond, environmental quality or ecotoxicological standards were exceeded during sampling, with pesticide and transformation product sum concentrations of up to 27 mu g/L. Downstream from the study pond, few exceedances were observed, with a maximum total concentration of 2.2 mu g/L, reflecting significant water quality improvement. (c) 2021 Elsevier B.V. All rights reserved.
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