江苏河网区地表水沉积物中OCPs的赋存特征及风险  

Sediment occurrences and risk of organochlorine pesticides in the surface water across a river network area in Jiangsu

作　　者：韦皓元 林贵英 姚晓龙[2] 李建平 王苏红 龚雄虎 蔡永久[2] 张路[2] 赵中华[2] WEI Hao-yuan;LIN Gui-ying;YAO Xiao-long;LI Jian-ping;WANG Su-hong;GONG Xiong-hu;CAI Yong-jiu;ZHANG Lu;ZHAO Zhong-hua(College of Urban and Environmental Sciences,Hubei Normal University,Huangshi 435002,China;State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China;Yangzhou Urban River Management Office,Yangzhou 225000,China)

机构地区：[1]湖北师范大学城市与环境学院,湖北黄石435002 [2]中国科学院南京地理与湖泊研究所,湖泊与环境国家重点实验室,江苏南京210008 [3]扬州市城市河道管理处,江苏扬州225000

出　　处：《中国环境科学》2024年第2期923-931,共9页China Environmental Science

基　　金：国家自然科学基金资助项目(42277404);江苏省自然科学基金青年基金资助项目(BK20201098)。

摘　　要：选取我国平原河网典型区域—江苏省内重点湖泊、水库及河流等为研究对象,系统调查江苏省地表水环境沉积物中有机氯农药(OCPs)的残留现状,解析区域空间分布特征和来源并评估其生态风险.结果表明,目标区域湖泊、水库及河流表层沉积物中20种OCPs化合物检出率为100%,残留范围为0.41~10.62ng/g dw(平均值为3.14ng/g dw).与国内其它流域相比,江苏省地表水环境表层沉积物中OCPs的污染负荷整体处于较低水平.OCPs单体化合物特征比值溯源结果显示,江苏省表层沉积物中的OCPs主要来源于历史残留.运用风险熵值法对江苏省表层沉积物OCPs进行生态风险评估,结果显示环氧七氯是主要的生态风险因子,其次为α-硫丹和异狄氏剂.联合生态风险评价表明太湖梅梁湾湖区处于高风险,不同水体类型沉积物OCPs风险水平呈现为湖泊高于河流、河流高于水库的整体趋势.在国家加强新污染物治理的背景下,OCPs等传统持久性有机污染物POPs同样需要持续关注,支撑流域水环境复合污染治理和风险防范.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 byα-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.

关 键 词：平原河网 地表水 沉积物 有机氯农药(OCPs) 风险评估 

分 类 号：X52[环境科学与工程—环境工程]