北京市土壤重金属形态分析

Heavy Metal Pattern in Soils of Beijing

采用Tessier连续提取法对北京市朝阳、通州、石景山、海淀、顺义等地土壤进行重金属元素锌、铅、铬的形态分析,并用原子吸收分光光度法测定了重金属元素的含量。研究结果表明,在所测区土壤中,铬主要以可交换态和残渣态存在,说明元素铬较活泼,具有潜在的环境影响能力;锌元素主要以有机结合态和残渣态存在,说明元素锌相对比较稳定;而铅则主要以可交换态形式存在,说明铅最为活泼,应该给予更多的关注。

The selective sequential extraction procedures developed by Tessier et al.(1979) was used to study heavy metal pattern in soils of Chaoyang,Tongzhou, Shijingshan,Haidian,and Shunyi districts of Beijing.The heavy metal contents were determined with AAS.Results showed that,in the surveyed soil,Chromium existed mainly in the exchangeable form and residual fraction,which confirmed that chromium was rather active and had potential influence on the environment.Zinc existed mainly in the organic phase and residual fraction,which indicated that zinc was comparatively stable.The lead,however,existed mainly in exchangeable form,which told that lead was the most active,and it should be paid more attention to.