Environmental Research Institute, MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou, 510006, PR China; School of Geography and Planning, Guangdong Provincial Key Laboratory of Urbanization and Geo-simulation, Sun Yat-sen University, Guangzhou, 510275, PR China.
School of Geography and Planning, Guangdong Provincial Key Laboratory of Urbanization and Geo-simulation, Sun Yat-sen University, Guangzhou, 510275, PR China.
Chemosphere. 2019 Feb;217:437-446. doi: 10.1016/j.chemosphere.2018.11.024. Epub 2018 Nov 3.
Occurrence and distribution of five neonicotinoids (NEOs) in surface water and sediment were studied in the Pearl Rivers, including three trunk streams, Dongjiang, Beijiang, Xijiang River (DR, BR and XR), South China. At least one neonicotinoid was detected in surface water and sediment of the Pearl Rivers, with imidacloprid (IMI) and thiamethoxam (THM) being the frequently detected NEOs. Total amount of NEOs (∑neonics) in surface water and sediment ranged from 24.0 to 322 ng/L, and from 0.11 to 11.6 ng/g dw, respectively. Moreover, the order of contamination level of NEOs in the Pearl Rivers was as follows: XR > DR > BR for surface water, and BR > DR > XR for sediment. Local agricultural activities and effluents of wastewater treatment plants (WWTPs) could be major sources of NEOs in the Pearl Rivers. Solubilization and dilution of NEOs between surface water and sediment during different seasons (spring and summer) could be attributed to rainfall intensities or climate of the Pearl River Delta. An ecological risk assessment of the exposure to current environmental concentration of imidacloprid and ∑NEOs suggests a threat to sensitive non-target invertebrates, including aquatic invertebrates. Results would provide a better understanding of NEOs contamination in the Pearl Rivers, as well as being a reliable dataset for decision-making in contamination control and environmental protection.
本研究调查了珠江（包括东江、北江和西江三条干流以及珠江三角洲的众多支流）水系中 5 种新烟碱类杀虫剂（NEOs）在地表水中的分布和赋存情况。地表水中至少检出了 1 种 NEOs，其中以吡虫啉（IMI）和噻虫嗪（THM）最为常见。珠江水系地表水中和沉积物中 NEOs 的总量（∑neonics）分别为 24.0-322ng/L 和 0.11-11.6ng/g dw。此外，珠江水系中 NEOs 的污染水平顺序为：XR＞DR＞BR（地表水中）和 BR＞DR＞XR（沉积物中）。当地农业活动和污水处理厂（WWTP）的废水可能是珠江水系中 NEOs 的主要来源。不同季节（春季和夏季）降雨强度或珠江三角洲气候导致了 NEOs 在地表水中的溶解和稀释。目前珠江水系中环境浓度的吡虫啉和∑NEOs 对敏感无脊椎动物（包括水生无脊椎动物）的暴露存在生态风险。研究结果将有助于更好地了解珠江水系 NEOs 的污染情况，为污染控制和环境保护的决策提供可靠的数据集。
