某重金属污染场地典型物质浓度空间分布研究

Spatial Distribution of Typical Substance Concentration in a Heavy Metal Contaminated Site

以上海某重金属污染场地为例,运用地统计方法探索了研究区内三种典型物质(Cu、Sb和Ni)的空间变异特征、分布特征和相关关系。结果表明,受人为作用下的随机因素影响,三种重金属浓度分布的空间变异性较强,占场地面积80%范围内的三种重金属浓度超过背景值,占场地面积21.37%和23.33%的Sb和Ni超过上海市敏感用地筛选值,且表层污染范围大于深层,主要分布于原冶炼车间和机械加工车间。此外Sb和Ni分别与Cu表现出显著的共生关系。

A heavy metal contaminated site in Shanghai was selected to study the spatial variability,spatial distribution characteristics and correlation of three typical substances（Cu、Sb and Ni） through geostatistical methods. Results indicated that concentrations of the three heavy metals present a high space dispersion and spatial variability,and this spatial variability is mainly caused by random factors under anthropogenic effect. The concentration of the three heavy metals exceeds the background value in the range of 80% of the site area,the district area in which concentrations of Sb and Ni exceeds the Screen values of Sensitive land in Shanghai occupy 21. 37% and 23. 33% of this site; the pollution area in surface soil is larger than in deep soil,and the pollution is mainly distributed in the original smelting workshop and mechanical processing workshop. In addition,heavy metal Sb and Ni show a significant symbiotic relationship with Cu,respectively.