哈尔滨市表土重金属地球化学基线的确定及污染程度评价

在实地采样测试的基础上,分别运用地质累积指数法和污染负荷指数法对哈尔滨市表土103个样品中的Hg、Cd、Pb、As元素的单因子污染程度和多元素综合污染状态进行了评价,并在ArcGIS平台下对区域污染程度进行空间可视化。地质累积指数法表明：哈尔滨市Hg、Cd、Pb和As的污染等级主要为1级和2级;各目标元素均有一定比例的3级污染等级,以Hg最为明显,其中Hg和Cd出现了4、5级污染,所占比例不大;污染负荷指数法的综合评价结果显示,点污染负荷指数（IPL）以Ⅰ级为主,呈中度污染,区域污染负荷指数（IPLzone）值为1.478,污染程度属于Ⅰ级。

Determination of geochemical baseline and pollution assessment of surficial soil heavy metals in Harbin city

In this paper,based on sampling and testing on the spot,geo-accumulation index and pollution load index were selected to evaluate the four elements pollution in surficial soil（Hg,Cd,Pb,As）,including 103 samples.geo-accumulation index can assess pollution degree in term of single factor and pollution load index was used to evaluate integrated pollution of the whole area.The step of visualization for the spatial heavy metals assessment was finished in ArcGIS workstation.Analyzing through geo-accumulation index,the pollution degrees of Hg,Cd,Pb,and As were dominated by the first grade and second grade,which is corresponded to non-pollution,slight pollution or moderate pollution.The third grade also exists,especially Hg.In addition,the last two pollution levels exist for the metals of Hg and Cd whose percentage are very low.The results are gained by using pollution load index,point pollution load index（IPL）mainly belongs to the first grade and zone pollution load index（IPLzone）is 1.478,which belongs to the first grade.