典型煤矿工业园区土壤重金属污染评价

随着工业化进程的加快,一些农业用地转为工业用地,土地用途的转变可能会影响周围土壤的质量。该研究以河南省东部某煤矿工业园区为对象,分成不同小区采集土壤样品,分析工业园区内表层土壤的Hg、Cd、Zn、As、Pb、Cr六种重金属含量及污染评价,并同时与周边土壤重金属含量进行比较,分析可能造成土壤环境污染的因子。结果表明,根据土壤环境质量标准,工业园区域内土壤污染指数小于0.7,土壤清洁;但与周边土壤比较存在污染的风险,潜在重金属威胁主要表现为Hg,其他重金属污染风险趋势为Cd>Zn>As>Pb>Cr;在空间分布上,除Cr外,随着与工业园区距离的加大,其他五种重金属其含量有降低的趋势;同时根据结果提出合理土壤污染防控建议。

Soil Heavy Metal Pollution Assessment in Typical Coal Industry Park of Henan Province

With the accelerating process of industrialization,a large number of agriculture land have been turned to industrial using land,which leads to affect the soil environment quality of the surroundings.By the method of partition sampling,the topsoil samples were collected from area of coal industrial park in Henan Province.The contents and pollution indices of soil Hg,Cd,Zn,As,Pb and Cr were analyzed.The heavy metal contents of surrounding soil were analyzed and compared to indicate the potential factors or trend of soil environmental pollution.The results showed that the single pollution index and the Nemerow pollution index of six heavy metals in soil in coal industry park were in the security level.But the average contents were higher than the surroundings.The potential heavy metal pollution risk factor might be Hg,followed by Cd,Zn,As,Pb and Cr.As the spatial distribution,except for Cr,other tested heavy metal contents decreased with the increase of distance from the industrial park.Finally,some reasonable suggestions for soil pollution prevention were put forward according to the results of this research.