衡阳松江工业园土壤重金属的污染研究

Study on the Soil Heavy Metal Pollution in Songjiang Industrial Park of Hengyang City

为了研究衡阳松江工业园土壤重金属的污染特征,采集了该园区及其周边土壤23个样品,测定了土壤中重金属Cu、Pb、Cd、Zn、As、Hg的含量,并采用地累积指数法和潜在生态危害指数法对土壤重金属污染程度进行了评价。结果表明:松江工业园土壤中Cu、Pb、Cd、Zn、As、Hg的平均含量分别为63.0 mg/kg、323 mg/kg、9.21mg/kg、373mg/kg、19.7mg/kg、0.287mg/kg,均高于全国土壤元素背景值和湖南省土壤元素背景值;Cd、Pb、Zn分别处于严重、中度、偏中度污染,土壤重金属污染程度的排序为Cd>Pb>Zn>Hg>Cu>As,表明衡阳松江工业园土壤重金属具有很强的潜在生态危害。

For the purpose of studying the contamination characteristics of soil heavy metals in Songjiang Industrial Park of Hengyang City,a survey is conducted. Contents of heavy metals （Cu,Pb,Cd,Zn,As and Hg）in the soil of 23 sites in the park and surrounding area are analyzed and measured. Geo-accumulation index and potential ecological risk index are employed to assess the pollution degree of heavy metals in the soil. The results show that the average contents of Cu,Pb,Cd,Zn,As and Hg are 63.0 mg/kg,323 mg/kg, 9.21 mg/kg, 373 mg/kg, 19. 7 mg/kg and 0. 287 mg/kg, respectively, and that they are higher than the background values of Hunan Province and the rest of the nation. The pollution assessment shows that the order of pollution degree of heavy metals is Cd〉Pb〉Zn〉Hg〉Cu〉As, and that the contamination status of Cd, Pb and Zn are serious, moderate and partially moderate, respectively. Soil heavy metal pollution has a strong potential ecological harm in Songjiang Industrial Park.