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摘要: 为查明我国西北地区某金属矿山周边的表层土壤（0 ~ 20 cm）重金属污染特征及其影响范围，采集并分析了314 个样品中Cu、Pb、Cd、As、Hg、Zn、Cr、Ni 等重金属元素含量，并采用污染指数法和潜在生态危害指数法评价其生态风险程度。研究结果表明：（1）Cd、Pb、Zn、Cu、As均高出区域背景值，Cr、Ni 主要来自成土母岩；Hg元素污染较集中，受人为活动影响强烈；（2）重金属元素污染程度由强到弱依次为Cd> Cu > Zn >As> Pb ＞Cr＞Ni＞Hg；（3）重金属元素潜在生态危害指数的平均值由大到小依次为Ei (Cd)＞ Ei (As)＞ Ei (Cu) ＞ Ei (Pb) ＞ Ei (Hg) ＞ Ei (Zn) ＞ Ei (Ni) ＞ Ei (Cr)；（4）区内土壤重金属污染水平为重度污染，综合潜在生态风险程度为中等危害。Abstract: In order to find outidentify the characteristics and influence range of heavy metal pollution in surface soil (0-20cm) around a metal mine in northwest Northwest China, 314 samples were collected and analyzed for heavy metal elements such asthe contents of Cu, Pb, Cd, As, Hg, Zn, Cr and Ni etc. in 314 samples were collected and analyzed, and the degree of ecological risk degree was evaluated by using the pollution index method and potential ecological hazard index method. The results show that: (1) Cd, Pb, Zn, Cu and As concentration are all higher than the regional background values, and Cr and Ni are mainly derived from mother rocks. The pollution of Hg element pollution is more concentrated and strongly affected by human activities. (2) The pollution degree of heavy metal elements is ranked from the strongest to the weakest, with Cd>Cu>Zn>As>Pb > Cr > Ni > Hg in the order of heavy metal pollution degree from strong to weak;(. (3) The average values of the potential ecological hazard index of heavy metal elements werewas (Cd) > (As) > (Cu) > (Pb) > (Hg) > (Zn) > (Ni) > (Cr) in descending order. (4) The heavy metal pollution level of soil in the studied area is severeserious pollution, and the comprehensive potential ecological risk degree is moderate harm.
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Key words:
- soil pollution /
- heavy metal /
- pollution index /
- risk assessment /
- metal mine
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