武汉市城市土壤重金属粒径分布特征  

Particla-siz distribution of heavy metals in urban soil of Wuhan,China

作　　者：王凯[1,2] 凌其聪[1] 

机构地区：[1]中国地质大学地球科学学院,武汉430074 [2]中国地质大学研究生院,武汉430074

出　　处：《环境化学》2013年第12期2329-2335,共7页Environmental Chemistry

基　　金：国土资源大调查项目(12120100511103)资助

摘　　要：对武汉市不同环境背景土壤中Cd、Pb、Cu、Zn等重金属元素在3个粒径(<0.075 mm,0.075—0.15 mm,0.15—0.25 mm)中的含量及其存在形态特征进行了较系统研究,结果显示Cd在粒径<0.075 mm的土壤中含量最高,Cu、Pb和Zn则在0.15—0.25 mm粒径中含量最高.重金属的化学形态分布没有明显的粒径分布特征,但与土壤的环境背景有关,其中,以公园绿地土壤中的可活动态的含量最高.城市土壤中重金属的潜在危害性顺序是:Cd>Pb>Cu>Zn.Determination of the concentration and chemical form of heavy metals in different particle size soils is essential to the understanding of the risk posed by urban soil contamination to human health. In the present study, heavy metal（Cd, Pb, Cu, Zn） content and chemical form in three particle size fractions（ 〈0.075 mm, 0. 075-0.15 mm, 0. 15-0.25 mm） of urban soils in Wuhan city were determined. It was showed that the content of Cd was highest in the size fraction of 〈 0. 075 mm, while the contents of Pb, Cu and Zn were highest in the size fraction of 0. 15----0. 25 mm. No apparent particle size distribution was found for the chemical form of heavy metals, but it was associated with the environmental background of urban soil, In which the extractable fraction of heavy metal was highest in the park soil. Potential hazard of the heavy metals in Wuhan urban soil is in the order of Cd 〉 Pb 〉 Cu 〉 Zn.

关 键 词：城市土壤 重金属 化学形态 粒径分布 

分 类 号：X833[环境科学与工程—环境工程]