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Effects of season and sediment-water exchange processes on the partitioning of pesticides in the catchment environment: implications for pesticides monitoring.

Cui, Song; Hough, Rupert; Yates, Kyari; Osprey, Mark; Kerr, Christine; Cooper, Pat; Coull, Malcolm; Zhang, Zulin

Authors

Song Cui

Rupert Hough

Kyari Yates

Mark Osprey

Christine Kerr

Pat Cooper

Malcolm Coull

Zulin Zhang



Abstract

Current and historic pesticide use has potential to compromise e.g. drinking water sources due to both primary and secondary emission sources. Understanding the spatial and temporal dynamics of emissions might help inform management decisions. To explore this potential; water, sediment and soil samples were concurrently collected from the River Ugie, Scotland over four seasons. Occurrence and fate of nine pesticides including four historic-use pesticides (HUPs): simazine, atrazine, isoproturon and permethrin, and five current-use pesticides (CUPs): metaldehyde, chlorpyrifos, chlortoluron, epoxiconazole and cypermethrin were analysed. Concentrations of target pesticides in water, sediments and soils were 4.5–45.6 ng·L−1, 0.9–4.6 ng·g−1 dw (dry weight) and 1.7–8.0 ng·g−1 dw, respectively. Concentrations of pesticides in water were found to significantly differ between seasons (p [less than] 0.05). Significant differences in pesticide concentrations also occurred spatially within sediments (p[less than]0.01), indicating spatial and temporal associations with pesticide use. Sediment-water exchange showed that the sediment acts as an important secondary emission source particularly for the HUPs, while current local application and sediment emission are both major driving forces for CUPs in the riverine environment. These findings were supported by concentration ratios between different media, which showed potential as a preliminary assessment tool for identifying the source of pollutants in aquatic environments.

Journal Article Type Article
Publication Date Jan 1, 2020
Journal Science of The Total Environment
Print ISSN 0048-9697
Electronic ISSN 1879-1026
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 698
Article Number 134228
Institution Citation CUI, S., HOUGH, R., YATES, K., OSPREY, M., KERR, C., COOPER, P., COULL, M. and ZHANG, Z. 2020. Effects of season and sediment-water exchange processes on the partitioning of pesticides in the catchment environment: implications for pesticides monitoring. Science of the total environment [online], 698, article ID 134228. Available from: https://doi.org/10.1016/j.scitotenv.2019.134228
DOI https://doi.org/10.1016/j.scitotenv.2019.134228
Keywords Pesticides; Partitioning; Compartment; Sediment-water exchange

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