天津污灌区土壤重金属污染环境质量与环境效应

Environmental quality and biological effects of heavy metals in soils in the regions of sewage irrigation in Tianjin

污水作为天津解决农业用水不足的手段已经有几十年的历史。文章分析了污灌区土壤-作物系统中Cd、Hg、As、Cu、Pb、Zn和Cr等有毒重金属的质量分数,利用单因子污染指数法和加权综合污染指数法进行污染评价。评价结果表明污灌区土壤受到了严重污染,主要重金属污染元素为Cd、Hg;农作物中的主要超标元素为Cd、As。因此,污灌区重金属污染土壤的修复工作迫在眉睫。

Sewage, an important water resource, has been used for agricultural irrigation in Tianjin. Heavy metal contents of Cu, Pb, Zn, Cr, Cd, As and Hg in soil-crop system in the regions of sewage irrigation in Tianjin were analyzed and the environmental quality of the soils was evaluated by using single factor index and integrative index. The results show that the soils in the regions of sewage irrigation have been seriously polluted by the heavy metal elements from sewage, and the environment quality of the soils was at the V grade. The main heavy metals of pollution in soils are Cd and Hg, and in crops are Cd, As.