Sediment occurrences and risk of organochlorine pesticides in the surface water across a river network area in Jiangsu
In order to evaluate the ecological risks and provide scientific basis for the improvement of water quality and pollution control in the plain river network regions in China,a comprehensive investigation was conducted to quantify the residues of organochlorine pesticides(OCPs)in surface water sediments in Jiangsu Province,a typical plain river network region which includes key lakes,reservoirs,and rivers.The detection rate of 20OCP compounds in the surface sediments of the target lakes,reservoirs,and rivers was 100％,with residues ranging from 0.41 to 10.62ng/g dw(average 3.14ng/g dw).Compared with other domestic river basins,the overall pollution load of OCPs was relatively low.The source tracing results of OCP individual compound characteristic ratios demonstrate that the OCPs in the surface sediments mainly originated from historical residues.We found that Heptachlor epoxide was the main ecological risk factor,followed by α-Endosulfan and Endrin;and the Meiliangwan Lake area of Taihu Lake was at a high risk,of which the OCPs risk level was higher in various water bodies than in rivers,and higher in rivers than in reservoirs.In the context of strengthening the control of new pollutants,OCPs and other traditional persistent organic pollutants(POPs)also require continued attention to support complex pollution control and risk prevention of the water environment in the basin.
plain river networksurface watersedimentorganochlorine pesticides(OCPs)risk assessment
万方数据
维普
