某金属矿产工业区土壤污染及土壤环境质量评价

摘要

We obtained supergene enrichment factors of heavy metals with the method of comparing the reference values and the background values in a city in China. The result showed that three elements of Hg,Cd and Se reached to the point of strong supergene enrichment by the influence of human activity. Reference values and background values basically represented the reality of the soil geochemistry and native background of survey area. Distribution of three elements of Cd,Pb and Hg in the surface soil has strong stack. According to the soil environmental quality evaluation and standard,class Ⅲ soil and super class Ⅲ accounted for 6%and 19%of the total area. The major elements exceeding standard were Cd,Pb and As. The reasons of exceeding standard of the heavy metals were waste emission of lead and zinc smelting plant nearby.%以中国某市区为例,采用基准值和背景值相比较的方法得出该地区重金属的表生富集系数,经分析得出,调查区由于受人类活动的影响,Hg、Cd、Se三种元素达到表生强富集的程度;基准值和背景值含量基本代表了调查区土壤地球化学现实状况和原生背景,经叠加分析得出Cd、Pb、Hg三种元素在表层土壤中的分布已呈现强叠加.根据土壤环境质量评价及标准,Ⅲ类土壤和超Ⅲ类土壤占总面积的6%和19%,超标元素主要为Cd、Pb、As等,超标原因推断为村庄附近的铅锌冶炼加工厂三废排放.