中山市不同类型企业周边土壤重金属污染特性及潜在生态风险评价

The Features and Potential Ecological Risk Assessment of Heavy Metals in Surrounding Soils of Different Types of Enterprises in Zhongshan Municipality

以中山市不同类型涉重金属企业周边土壤（0-20cm）为调查对象,分析了土壤中重金属Cu、Zn、Pb、Cd、Cr、Hg和As的含量,采用地积累指数法和潜在生态危害指数法对土壤重金属污染进行了分析和评价。结果表明,除Pb外其它7种元素含量超过广东省背景值,不同类型土壤环境的污染程度地积累指数评价处于无-中度污染,潜在生态危害处于强度危害程度。统计分析表明,Cr、Ni、Cu、Zn具有显著相关性,不同类型企业周边土壤中重金属污染主要受Cr、Cu、Ni、Zn控制,其次是受As、Hg和Cd控制。

The contents of soil heavy metals,such as Cu,Zn,Pb,Cd,Cr,Hg and As,in surface soil（0~20cm）from different types of enterprises surrounding Zhongshan Municipality,were investigated.Two indices-the Index of Geoaccumulation and the Potential Ecological Risk Index-were used to evaluate the degree of heavy metal pollution.The results indicated that the contents of 7kinds of heavy metals exceeded the soil background values of Guangdong Province except Pb.And the pollution levels of soils in the study area are characterized as being low to moderate with the evaluation of the Index of Geoaccumulation,imposing a strong potential ecological risk.There was a significant correlation to Cr,Ni,Cu and Zn through statistical analysis.The pollution heavy metals were dominated by Cr,Cu,Ni and Zn,followed by As,Hg and Cd.