上海某区域低效工业用地土壤重金属含量特征及生态风险分析

为探明上海低效工业用地土壤重金属含量特征及生态风险状况,在某区域选取3种典型低效工业用地地块,分别检测As、Cd、Cr、Cu、Pb、Ni、Zn、Hg八种重金属。结果表明:区域内土壤重金属因人类活动呈现出富集现象,其中个别点位Cd、Hg、Ni超标,大部分点位重金属均超过背景值。Pearson相关性分析研究发现:Hg与Cd可能主要来源于生活垃圾及周边电镀等工业企业;Cu、Pb、Ni、Zn和Cr可能主要来自于生活污水、工业废气、汽车尾气,污染气体中的重金属通过干湿降落后渗入土壤;As可能主要受成土母质的影响。潜在生态风险评价及生态风险预警结果表明:以上海市背景值为参照,Hg和Cd处于中等至高等风险水平,其它重金属皆为低风险水平。

Characteristics and ecological risk analysis of heavy metals in soils of low-efficiency industrial land in Shanghai

In order to explore the characteristics and ecological risk of heavy metals in soils of low-efficiency industrial land in Shanghai,this study selected three types of typical low-efficiency industrial land in Shanghai,and tested for eight heavy metals,As,Cd,Cr,Cu,Pb,Ni,Zn,and Hg.The results showed that the soil was enriched with eight kinds of heavy metals to a certain extent due to human activities,in which individual points of Cd,Hg,and Ni exceeded the standard,and most heavy metals exceeded the background value.Pearson correlation analysis found that Hg and Cd might mainly originate from domestic garbage and other industrial enterprises,such as peripheral electronics factories and electroplating factories.Taking the background value of Shanghai as a reference ratio,Hg and Cd were of medium to high risk,while other heavy metals were of low ecological risk.