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Zhang Hui, Ma Dongsheng(Department of Earth Science, Nanjing University, Nanjing 210093)  
Four areas, a metal smelter, a large plot of rubbish from human daily life and a shoal of river in Nanjing, were studied for metal fractionation in soil by sequential extraction of Cu, Pb, Co, Fe, Ni, Mn. The extraction effect were evaluated by the measurement of Ca, Al and Si content from each extraction step as well as the result of X ray analysis. It was demonstrated that the available Cu is mainly bound to organic matter, Pb to exchangeable, Co and Mn to Fe Mn oxides. Available Fe and Ni are less than 10% of their total content and mainly in the Fe Mn oxides. In residue, Mn is 22 8%—33 4% of its total contents and Co is 24 5%—67 1% its total contents,while others are more than 50%. Heavy metals inputed through air (highway, smelter) are mainly bound to Fe Mn oxides and those brought in by water (plot of rubbish, shoal of river) mainly bound to organic matter. For availability to vegetation in Nanjing region, Pb is the most important one, Co and Cu are next, Ni is least
【Fund】: 江苏省自然科学基金
【CateGory Index】: X53
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