宁夏盐池县土壤重金属污染状况及评价

Status and Evaluation of Soil Heavy Metal Pollution in Yanchi County of Ningxia

为了查清宁夏盐池县土壤重金属污染状况,以确保盐池县农业产业的持续健康发展,通过多目标地球化学调查双层网格化采样,测定了Hg、Cd、As、Pb、Cu、Zn、Ni、Cr 8项重金属元素的含量,采用单一元素指数和内梅罗综合指数法对盐池县土壤(0～20 cm)重金属污染状况进行评价和研究。结果表明,盐池县土壤99.94%呈清洁状态,存在Pb元素的点状轻度污染,内梅罗指数(P综)介于0.11～0.77之间,平均值为0.23,表明盐池县土壤整体处于安全状态;Hg元素背景值高于基准值,虽未达到污染级别,但表层土壤存在外源物质的进入,值得持续关注。

It's imperative to find out the status of soil heavy metal pollution of Yanchi County for the agriculture industry developing continuously and healthily. The content of the contents of heavy metals in Hg, Cd, As, Pb, Cu, Zn, Ni and Cr were determined by multi-objective geochemical survey by double grid sampling, and the soil (0~20 cm) heavy metal pollution in Yanchi County was evaluated and studied by using the single element and the Nemerow composite element. The results showed that 99.94% of the soil in the county was clean, and there was spot-like slight pollution of Pb. And the Nemerow index (P) was between 0.11 and 0.77 with an average value of 0.23, indicating that the soil in the whole county was in a safe state. The background value of Hg element was higher than the baseline value. Although it does not reach the pollution level, the entry of exogenous substances exists in the surface soil, which deserves continuous attention.