南京城市土壤中重金属的化学形态分布  

THE CHEMICAL SPECIATION OF HEAVY METALS OF URBAN SOIL IN NANJING

作　　者：卢瑛[1] 龚子同[2] 张甘霖[2] 

机构地区：[1]华南农业大学资源环境学院 [2]中国科学院南京土壤研究所,南京210008

出　　处：《环境化学》2003年第2期131-136,共6页Environmental Chemistry

基　　金：国家自然科学基金重点项目 (40 2 3 5 0 5 4 );中国科学院知识创新工程重要方向性项目 (KZCX3 SW 4 2 7)项目

摘　　要：采取Tessier连续提取法 ,研究了南京市不同城区表层土壤中Fe ,Mn ,Cr,Ni,Co,V ,Cu ,Zn ,Pb的化学形态分布 .结果表明 ,南京城市土壤中Fe,Mn ,Cr,Ni,Co ,V ,Zn ,Pb以残渣晶格态为主 ,可交换态比例极低 ;Cu在城市道路旁的土壤中有机物结合态所占的比例最高 ,其他区域残渣晶格态所占的比例最高 .与非城区自然土壤相比 ,主要来源于人为输入的Mn,Cu ,Zn ,Pb残渣晶格态所占的比例低 ,活性态比例大 ;Cr和主要来源于原土壤物质的Fe,Ni,Co ,V在城市土壤与非城区自然土壤中各形态所占的比例相似 ,残渣晶格态比例大 。According to sequential extraction procedures of Tessier et al.,we studied the chemical speciation of Fe,Mn,Cr,Ni,Co,V,Cu,Zn and Pb in urban soils of Nanjing in this paper.The results indicated that Fe,Mn,Cr,Ni,Co,V,Zn and Pb in Nanjing urban soils were dominated by the residual fraction,and were least present in exchangeable fraction.Cu was dominated by organic fraction in roadside soils,and was dominated by residual fraction in other urban district soils,Compared with non-urban natural soil,the proportion of residual fraction of Mn,Cu,Zn and Pb,which mainly originated from anthropogenic sources,was lower,and active fraction was higher.The proportion of different fractions of Cr,and Fe,Ni,Co and V which mainly originated from original soil materiasls,was similar in urban and non-urban soils,the proportion of residual fraction was high,and active fraction was very low.

关 键 词：重金属 形态 活性 城市土壤 南京市 化学形态分布 

分 类 号：X53[环境科学与工程—环境工程]