Occurrence and distribution of neonicotinoid insecticides in surface water and sediment of the Guangzhou section of the Pearl River, South China. (August 2019)

• Record Type: Journal Article
• Authors: Yi, Xiaohui; Zhang, Chao; Liu, Hongbin; Wu, Renren; Tian, Di; Ruan, Jujun; Zhang, Tao; Huang, Mingzhi; Ying, Guangguo
• Is Part Of: Environmental pollution. Volume 251(2019)
• Page Start: 892
• Page End: 900
• Publication Date: 2019-08
• Subjects: Imidacloprid -- Thiamethoxam -- Neonicotinoids -- Urban area -- Aquatic organism; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2019.05.062
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: 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 (∑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%) 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 WWTPs 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. Graphical abstract: Image 1 Highlights: Occurrence of neonicotinoids in the Guangzhou section of the Pearl River is examined. At least one or two neonicotinoids was detected in each water and sediment sample. IMI, THM and ACE were frequently detected (100%) neonicotinoids from surface water. Western- and Front-suffered a higher neonicotinoids contamination than Rear river-route. The Guangzhou section of the Pearl River could be confronted with a moderate neonicotinoid contamination. Abstract : This article evaluates the residual level and distribution of neonicotinoids in the Guangzhou section of the Pearl River, South China. It is of great significance to fully understand the migration, transformation, contamination situation and ecological risk of neonicotinoid insecticides.