摘要
选取抚顺市郊农田土壤样品,采用Tessier顺序提取法研究土壤中重金属的化学赋存形态。研究结果表明:在该区域土壤中,As、Cr、Cu、Hg和Zn的形态分布以残渣态为主,Pb的形态分布以铁锰氧化态和残渣态为主,而Cd的主要赋存形态是离子交换态、腐殖酸结合态和碳酸盐结合态。研究区域土壤中除As以外其他各元素总量的平均值均高于全国土壤背景值,其重金属的形态分布主要以化学行为稳定的残渣态和化学行为相对稳定的铁锰氧化态、腐殖酸结合态为主,而Cd以化学行为较为活跃的离子交换态为主,这应当引起关注。
Selecting the sample of farmland soil from Fushun, the chemical speciation of heacy metals were researched by using Tessier sequen- tial extraction method. The results showed that As, Cr,Cu, Hg and Zn were mainly in residual fraction, Pb was mainly in Fe-Mn oxides and residual fraction, and Cd was in exchangeable,organic and carbonates fraction. The mean concentrations of the heavy metals in the sample were much higher than the background levels except for As. The speciation distributions of the heavy metal were mainly in the chemical stable residual and relative sta- bility of the iron-manganese oxides and humic acid forms, however the Cd mainly existed as ion exchange state of the high chemical activity, it should be paid much more attention.
出处
《化学与粘合》
CAS
2015年第3期228-230,共3页
Chemistry and Adhesion
