Journal
ENVIRONMENTAL POLLUTION
Volume 251, Issue -, Pages 892-900Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2019.05.062
Keywords
Imidacloprid; Thiamethoxam; Neonicotinoids; Urban area; Aquatic organism
Categories
Funding
- National Natural Science Foundation of China [21677184]
- Guangdong Provincial Natural Science Foundation [2016A030306033]
- Guangdong Provincial Science and Technology Plan Project Foundation [2014A020216007]
- Technological Innovation Young Talents of Guangdong Special Support Plan [2014TQ01Z530]
- Pearl River Nova Program of Guangzhou [201506010058]
- Guangdong Foundation for Program of Science and Technology Research [2017B030314057]
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Little information is available about the occurrence of neonicotinoid insecticides in surface water and sediment of the metropolitan regions around the rivers in China. Here we investigate the residual level of neonicotinoids in the Guangzhou section of the Pearl River. At least one or two neonicotinoids was detected in each surface water and sediment, and the total amount of neonicotinoids (Sigma(5)neonics) in surface water ranged from 92.6 to 321 ng/L with a geometric mean (GM) of 174 ng/L. Imidacloprid, thiamethoxam and acetamiprid were three frequently detected neonicotinoids (100%2 from surface water. As for the sediment, total concentration was varied between 0.40 and 2.59 ng/g dw with a GM of 1.12 ng/g dw, and acetamiprid and thiacloprid were the common sediment neonicotinoids. Western and Front river-route of the Guangzhou section of the Pearl River suffered a higher neonicotinoids contamination than the Rear river-route, resulting from more effluents of WWTP5 receiving, and intensive commercial and human activities. Level of residual neonicotinoids in surface water was significantly correlated with the water quality (p < 0.01), especially items of pH, DO and ORP, and nitrogen and phosphorus contaminants. Compared with reports about residual neonicotinoids in water and sediment previously, the metropolitan regions of the Guangzhou could be confronted with a moderate contamination and showed serious ecological threats (even heavier than the Pearl Rivers). Our results will provide valuable data for understanding of neonicotinoids contamination in the Pearl River Delta and be helpful for further assessing environmental risk of neonicotinoids. (C) 2019 Elsevier Ltd. All rights reserved.
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