沈阳张士污灌区土壤重金属元素形态分析

选取沈阳张士污灌区土攘样品,采用欧共体标准局的三步提取法研究土壤中5种重金属元素的形态分布.研究结果表明,在该污灌区土壤中,Cd和zn主要以B1(水溶态、可交换态与碳酸盐结合态)和B2(铁-锰氧化物结合态)为主,分别占总量的49.4%、26.4%和43.9%、44.3%.Cu、Pb主要以B2(铁-锰氧化物结合态)和B3(有机物与硫化物结合态)为主分别占总量的43.4%、66.6%和29.1%、25.3%.Cr以B3(有机物与硫化物结合态)和残渣态为主,分别占总量的40.4%和42.5%.元素总量和形态分析的结果表明该地区土壤污染为单一的镉污染土壤,且镉的可迁移性强,易被植物吸收.

Speciation of Heavy Metals in Soil From Zhangshi Soil of Shenyang Contaminated by Industrial Wastewater

The paper investigates the speciation of heavy metals in soil samples from Zhangshi district of Shenyang,where soils were irrigated by industrial wastewater,Using BCR three-steps sequential extraction method.The results show that Cd and Zn are mainly in B1(water-soluble,exchangeable,carbonates fraction) and B2(bound to Fe-Mn oxides) fraction,accounting for 49.4%,26.4% and 43.9%,44.3% respectively.Cu and Pb primarily in B2(bound to Fe-Mn oxides) and B3(bound to organic matter and sulfide),both account for 43.4%,66.6% and 29.1%,25.3%.B2(bound to Fe-Mn oxides) and residuals are Cr major forms,accounting for 40.4% and 42.5% respectively.In the end,we draw the conclusion that the district is not complex but single Cadmium contamination.Moreover,Cd is more mobile and readily absorbed by plants.