宿州市矿区与耕地土壤重金属含量及其潜在生态风险评价

以调查宿州市矿区与耕地土壤的重金属污染状况数据为基础,按照有关标准和方法,对宿州市矿区与耕地土壤重金属潜在生态风险进行了评价,结果表明:宿州市矿区土壤重金属含量均值除Pb外,其它都大于耕地,且Hg、Cr含量远远超过耕地;从单因子污染指数看,矿区土壤重金属污染主要是Hg、Cr的污染,而耕地整体状况良好;从内梅罗综合污染指数的均值来看,矿区土壤全部被污染,耕地仅有6%中度污染,8%轻度污染;从潜在生态风险指数来看,矿区土壤属于中等风险等级,耕地属于低风险等级,各重金属元素对矿区土壤潜在生态风险贡献大小顺序为:矿区土壤Hg>Cd>As>Cr>Cu>Zn>Pb,Hg潜在生态风险最大。

Distribution and Evaluation on Potential Ecological Risk of Heavy Metals in Soils of Suzhou

The potential ecological risk of heavy metals in soil was evaluated based on the related standards and methods and the investigation of heavy metal pollution status in soil of Suzhou.The results showed that the average concentration of heavy metals(except Pb) in mining soil of Suzhou were higher than that of cropland,especially Hg and Cr.The main pollutants of the mine soil heavy metal pollution in mining soil were Hg and Cr in the view of single factor pollution index.The mining soils were all polluted while only 6% of the cropland soil was moderate pollution and 8% was mild pollution in the view of the mean value of Nemerow multi-factor index.Mining soil was at moderate risk level,cropland was at low risk level in the view of potential risk index.The contribution to potential ecological risk in mine soil was in an order of Hg>Cd>As>Cr>Cu>Zn>Pb.Hg was at strong risk level of potential ecological risk.