内蒙古东部两个有色金属集中开采区土壤重金属污染健康风险评估的对比研究

Assessment on the health risk of soil heavy metals in two non-ferrous metal exploration areas in eastern Inner Mongolia

以内蒙古东部相距较近的两个有色金属集中开采区典型矿区或企业及其周边土壤为研究对象,对比分析其中五种重金属(Pb、Hg、Cd、Cr和类金属As)的污染情况,以及由此导致的健康风险。结果显示,Cd和As为研究区主要污染元素,地区一和地区二分别以Cd污染和As污染为主,地区一综合污染水平、Pb和Cd单项污染水平均高于地区二,As单项污染水平则低于地区二;两地区总致癌风险均超出可接受水平,地区一致癌风险水平高于地区二,主要致癌风险因子均为As和Cr,致癌风险贡献顺序:As>Cr;两地区存在非致癌风险,地区一非致癌风险水平高于地区二,主要非致癌风险因子均为As,其次为Cr和Pb,地区一和地区二的非致癌风险贡献顺序分别为:As>Pb>Cr和As>Cr>Pb。

Typical mines and factories and their surrounding soil of two non-ferrous metal mining areas in eastern Inner Mongolia were taken as the research object.Contamination of heavy metals such as Pb,Hg,Cd,Cr and As in soil was compared and health risk of heavy metal contaminated soil was assessed.The results show that Cd and As are the major contaminants in the research region.Cd and As are the primary contaminants respectively in region one and two.Comprehensive contamination level,Pb and Cd contamination level of region one is higher than of region two.As contamination level of region one is less than that of two.Total carcinogenic risk of two regions is beyond the acceptable level.Carcinogenic risk level of region one is higher than that of two.As and Cr are the major carcinogenic risk factors and the order of their carcinogenic risk contribution is As 〉 Cr.Two regions are engaged in non-carcinogenic risk.Non-carcinogenic risk level of region one is higher than two.As is the major non-carcinogenic risk factor and Cr and Pb are the secondary.The orders of their non-carcinogenic risk contribution of region one and two are As 〉 Pb 〉 Cr and As 〉 Cr 〉 Pb respectively.