地积累指数法在金尾矿库重金属污染评价中的应用

Application of Index of Geoaccumulation to evaluation of heavy metal pollution in gold tailing ponds

本文应用地积累指数法对金尾矿库重金属污染情况进行了评价研究,从陕西省土壤重金属背景值计算的地积累指数结果来看,尾矿库矿渣中Pb达到了极严重污染,Cu达到了中度-强度污染,Hg达到了中度污染,Cd达到了轻度-中度污染,Zn、Ni、Cr和As都不存在污染。从8种元素的分级频率来看,Pb的污染频率主要集中在强污染以上,Cd和Cu的中度污染频率较高,Zn、Ni和As三种元素的无污染频率达到了100%。除Pb、Cd和Hg三种元素的污染程度稍有不同外,尾矿库6个层次的重金属地积累指数没有明显差异。

Pollution of heavy metals in gold tailing pond is evaluated on the basis of the index of geoaccumulation(I geo),according to the results of the geoaccumulation index calculated based on the background values of heavy metals in the soil in Shaanxi Province,Pb in the tailings slag has reached extremely serious pollution,Cu has reached moderate-intensity pollution,Hg has reached moderate pollution,and Cd has reached mild moderate pollution,no pollution of Zn,Ni,Cr and As was found.From the classification frequency of the 8 elements,the intensive pollution frequency of Pb and the moderate pollution frequency of Cd and Cu are dominate,and the pollution-free frequency of the three elements of Zn,Ni and As has reached 100%.Except for the slightly different pollution levels of the three elements Pb,Cd and Hg,there is no significant difference in the accumulation index of heavy metals at the six layers of the tailings pond.