微山湖表层沉积物重金属含量及生态风险评价  

Heavy Metal Content in Surface Sediment and its Ecological Risk Assessment in Weishan Lake

作　　者：蒋万祥[1] 

机构地区：[1]枣庄学院生命科学系,山东枣庄277160

出　　处：《安徽农业科学》2011年第27期16694-16696,共3页Journal of Anhui Agricultural Sciences

基　　金：山东省自然科学基金项目(ZR2010CL004);枣庄学院博士科研基金;枣庄学院重点基金项目;枣庄学院青年基金项目;枣庄学院水生生物学重点学科建设项目

摘　　要：[目的]分析微山湖表层沉积物重金属含量,并对其进行生态风险评价。[方法]对微山湖表层沉积物重金属污染现状进行调查,通过分析重金属Cu、Zn、Pb、Cd、Cr的污染指数和潜在生态风险指数,对重金属污染生态风险进行评价。[结果]微山湖表层沉积物Cu、Zn、Pb、Cd、Cr、Ni平均含量分别为64.78、185.05、78.76、0.17、37.76、46.84 mg/kg。Cr和Cd含量在各站位均未超标;Cu、Pb含量超标率为100%,平均超标倍数分别为0.85、0.31倍;Zn含量的超标率为80%,平均超标倍数为0.24倍。Cu、Zn、Pb、Cd、Cr污染指数均值分别为1.85、1.23、1.31、0.34、0.47,重金属综合污染指数均值为5.21,属于低度污染;湖中航道和入湖河道污染程度较养殖区严重。潜在生态风险评价表明,Cu、Zn、Pb、Cd、Cr潜在生态风险指数均值分别为9.25、1.23、6.56、10.34、0.94,综合潜在生态风险指数均值为28.33,属于低度风险;重金属污染潜在生态风险表现为湖中航道>入湖河道>养殖区。[结论]该研究为南水北调东线微山湖生态环境的整治与改善提供了参考。[Objective] The aim was to analyze heavy metal content in surface sediment in Weishan Lake and further assess its ecological risk.[Method] Heavy metal pollution in surface sediment in Weishan Lake was studied,and the pollution index and potential ecological risk indices of Cu,Zn,Pb,Cd and Cr were calculated to assess the ecological risk of heavy metal pollution.[Result] Average contents of Cu,Zn,Pb,Cd,Cr and Ni were 64.78,185.05,78.76,0.17,37.76 and 46.84 mg/kg,respectively.Cr and Cd weren＇t beyond standards in all stations,while Cu and Pb exceeded standards in all stations,with average super-standard multiple of 0.85 and 0.31,respectively,and Zn content in 80% stations was beyond standards,with average super-standard multiple of 0.24.The pollution indices of Cu,Zn,Pb,Cd and Cr were 1.85,1.23,1.31,0.34 and 0.47,respectively,with average comprehensive pollution index of 5.21,and heavy metal pollution was light.In addition,pollution in the entryway portion and sea-route portion were more serious than that of breeding portion.Potential ecological risk assessment showed that the potential ecological risk indices of Cu,Zn,Pb,Cd and Cr were 9.25,1.23,6.56,10.34 and 0.94,respectively,with average comprehensive potential ecological risk index of 28.33,and potential ecological risk was slight.Besides,potential ecological risk order of heavy metal pollution was sea-route portion〉 entryway portion〉 breed portion.[Conclusion] The study could references for the regulation and improvement of ecological environment in Weishan Lake in the east route of south-to-north water transfer project.

关 键 词：微山湖 沉积物 重金属 潜在生态风险评价 综合污染指数 

分 类 号：X826[环境科学与工程—环境工程]