上海化学工业区土壤重金属元素形态分析

Speciation of heavy metals in soil from Shanghai Chemical Industry Park

选取上海化学工业区土壤背景值样品,采用Tessier A连续提取法研究土壤中6种重金属元素的形态分布。研究结果表明,在该化工区土壤中,Cd主要以可交换态和铁锰氧化物结合态为主,分别占总量的41.5%和36.7%,说明元素Cd较活泼,具有潜在的环境影响能力,应该给予更多的关注;Cr 、Cu、Ni和Zn等4种元素主要以有机结合态和残余态为主,两者分别占总量的41.4%、58.9%、31.4、32.5%和45.9%、31.5%、57.4%、52.3%;而Pb则主要以有机结合态形式存在,其占总量的87.8%;元素形态分析表明Cr、Cu、Ni、Zn和Pb这5种元素相对比较稳定。

The paper investigates the speciation of heavy metals in soil samples from Shanghai Chemical Industrial Park, using Tessier A sequential extraction method. The results show that Cd is mainly in exchangeable and Fe-Mn oxides fraction, accounting for 41.5% and 36.7% respectively. Cr, Cu, Ni and Zn in organic and residual fraction, both account for 41.4%, 58.9%, 31.4%, 32.5% and 45.9%, 31.5%, 57.4%, 52.3%. Pb is in organic fraction, accounting for 87.8%. In the end, we draw the conclusion that Cd is more active, and it has potential impact on environment, so more attention should be paid to it. The other ones are relatively inert.