模糊综合分析在场地土壤重金属评价中的应用

Fuzzy comprehensive assessment of heavy metal pollution

以福建省某场地为研究区,在面积约100 hm2的区域以网格布点法采集35件土壤样品,选择17件样品测定了Ni、Zn、Pb、Cd、Cr、Hg、Cu等7种重金属含量。从模糊分析的基本原理出发,运用模糊综合分析法对场地土壤重金属污染现状进行了评价。结果表明,场地土壤背景环境质量良好,基本未受重金属污染,除ZK2表层的土壤处于Ⅲ级和ZK5表层接近Ⅱ级外,其余均靠近Ⅰ级;Zn、Pb、Cd的变异系数超过50%,空间分布变异性较大;场地主要潜在重金属污染指标为Zn、Cd和Pb。

Based on the principle of fuzzy analysis,fuzzy comprehensive assessment was applied to evaluate the heavy metal pollution of site soil in Fujian province. 35 soil samples were collected from the site with an area of 100 hm2 and 17 soil samples were analyzed for concentration of seven kind of Ni、Zn、Pb、Cd、Cr、Hg、Cu.The results showed that the background environmental quality is good and unpolluted by heavy metals,except surface soil of ZK2 in grade Ⅲ and ZK5 close to grade Ⅱ,the rest are close to grade Ⅰ; the coefficients of variation of Zn,Pb,Cd are beyond 50%,the spatial variability of Zn,Pb,Cd are greater. The indicators of potential heavy metals pollution are Zn,Pb,Cd.