沈阳市丁香地区土壤重金属污染及生态风险评价

在丁香公园内设置5个点对土壤中的Cr、Hg、As、Cd、Pb进行含量分析,并用单因子指数法评价土壤污染程度,用Hakanson生态风险指数法对土壤潜在的生态风险进行评价。结果表明,丁香湖公园局部地区Hg、As、Cd超过GB15618-1995一级标准;从总的污染程度看,各污染物从大到小的顺序为:Cd>Hg>Pb>As>Cr,各点位从大到小顺序为:大转弯村>小韩村>丁香苗圃>丁香湖湖区>丁香园小区;从总的潜在生态危险程度看,各个点位的风险程度从高到低依次为:大转弯村>小韩村>丁香苗圃>丁香湖湖区>丁香园小区。

Evaluation on Potential Ecological Risk of Heavy Metal Pollution in Soil of Dingxiang District

Through analyzing the contents of typical pollution(Cr,Hg,As,Cd and Pb)in five special points of Dingxiang Park and adopting Single Factor Index and Ecological Risk Index,soil quality and potential ecological risk were evaluated.The content of Hg,As,Cd exceeded Nature Background Value(GB15618-1995)in some district of Dingxiang Park,the order of typical heavy metal pollution extent was Cd>Hg>Pb>As>Cr,the sequence of pollution extent was Dazhuanwan country>Xiaohan country>Dingxiang nursery>Dingxiang lake>Dingxiangyuan borough.The sequence of potential ecological risk was Dazhuanwan country>Xiaohan country>Dingxiang nursery>Dingxiang lake>Dingxiangyuan borough.