期刊
WATER RESEARCH
卷 218, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2022.118475
关键词
Neonicotinoids; Emerging contaminants; Emission history; Load estimation; Coastal waters; Marine sediment cores
资金
- National Key Research and Devel-opment Program of China [2016YFC0402604]
- Key Special Project for Introduced Talents Team of Southern Marine Science and Engi-neering Guangdong Laboratory (Guangzhou) [GML2019ZD0209]
- National Natural Science Foundation of China [41977300, 41907297]
- Guangdong Provincial Natural Science Foundation [2016A030306033]
- Science and Technology Program of Guangzhou [907224176081]
- Guangdong Foundation for Program of Sci-ence and Technology Research [2017B030314057]
This study investigated the contamination levels and compositions of NEOs in sediment cores from the Lingdingyang Estuary. The results showed that the emission of NEOs has increased over time, indicating the impact of agricultural runoff on the estuary. NEOs pose a potential risk to the environment and ecosystem.
Neonicotinoids (NEOs), as the most-consumed pesticides on a global scale, have posed a serious threat to human health and ecological environment. Information regarding the emission history of NEOs is of great importance to improve the prediction of their environmental loading and biological risk potential. In the present study, contamination levels and compositions of 12 NEOs were identified in 8 sediment cores from the Lingdingyang Estuary, which was impacted by agricultural emissions in riverine runoff of the Pearl River Basin for centuries. The total concentration of 12 target NEOs (nary sumation 12NEOs) ranged from 0.02 to 69.5 ng/g dw along the sediment core profile, with a mean of 12.9 +/-& nbsp;15.9 ng/g dw. Net deposition fluxes and concentrations of 5 parent NEOs experienced a remarkable exponential increase in the vertical profile of sediment cores, except for imidacloprid (IMI). Despite the similar exponential growth before 2012, subsequent decreased levels of IMI in historical sediment indicated its gradual replacement by other NEOs. IMI was the NEO with the highest frequency of 80.3% and the highest mean concentration of 7.66 +/-& nbsp; 8.76 ng/g dw. The ecological risk assessment of NEOs suggests that 65.1% of sediment samples exceeded the chronic threshold for aqueous organisms using equilibrium partitioning approach. Since downward diffusion of NEOs in the Lingdingyang Estuary was rectified by their rapid desorption, the sedimentary record probably provided an accurate illustration of agricultural NEO emissions in the Pearl River Basin, China. The recent NEO inventory in the adjacent waters of core sites was estimated with a mean of 76.8 tons/yr. This study provides insights into the role of agricultural emission in riverine runoff in the environmental loads of NEOs in the historical sediment.
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