Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 698, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.134228
Keywords
Pesticides; Partitioning; Compartment; Sediment-water exchange
Categories
Funding
- Scottish Governments' Rural and Environment Science and Analytical Services Division (RESAS)
- National Natural Science Foundation of China [51779047]
- Excellent Youth Science Foundation of Heilongjiang Province [YQ2019E001]
- Academic Backbone Project of Northeast Agricultural University [17XG04]
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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 < 0.05). Significant differences in pesticide concentrations also occurred spatially within sediments (p < 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. (C) 2019 Elsevier B.V. All rights reserved.
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