关中西部某铅锌冶炼区周边土壤重金属污染特征与生态风险评价

以关中西部某铅锌冶炼区周边土壤为研究对象,采用潜在生态危害指数法对冶炼厂周边土壤的重金属污染特征和潜在生态风险进行了研究。结果表明:某铅锌冶炼区周边土壤中Pb、Zn、Cu、Cd、Cr、Hg、As、Ni的平均含量均高于陕西省土壤元素背景值。除Cr元素以外,其余7种重金属元素存在两两之间的极显著或显著的相关性。土壤中重金属污染物总的潜在生态风险指数为轻微生态风险。因此该铅锌冶炼区周边土壤存在不同程度复合污染组合类型,生态风险总体水平较低,但局部有中重度污染。

Features of Heavy Metal Pollution of the Soil Surrounding the Lead and Zinc Plant and Assessment of Ecological Risk in Western Guanzhong

Soil samples were collected from the lead and zinc smelting area in Western Guanzhong and studied . Heavy metals pollution and potential ecological risks of the soils were investigated using the method of ecological risk index. The results showed that the contents of Pb , Zn , Cu , Cd , Cr , Hg , As and Ni in the soils were higher than the background values of Shaanxi Province. Except the Cr element, the remaining 7 kinds of heavy metal elements were extremely significant or significant correlation of each other. The total potential ecological risk index of soil heavy metal pollutants was little ecological risk. So, surrounding areas of lead and zinc plants existed various degree of combination pollution, general level of ecological risk in soil was low, but some areas were in severe pollution.