云浮矿区土壤Cd、Pb形态分布及潜在生态风险评价  

Speciation distribution and potential ecological risk assessment of Cd and Pb in Yunfu Pyrite area

作　　者：寇士伟[1] 蔡素英[1] 张博[1] 何嘉敏[1] 黄诗苑[1] 郑杰辉[1] 亦如瀚[1] 

机构地区：[1]暨南大学环境工程系广东省高校水土环境毒害性污染物防治与生物修复重点实验室,广东广州510632

出　　处：《暨南大学学报（自然科学与医学版）》2011年第1期48-52,共5页Journal of Jinan University(Natural Science & Medicine Edition)

基　　金：广东省科技计划项目(06B20601003);暨南大学2009年本科创新工程项目(cx090)

摘　　要：运用Tessier连续提取法对云浮硫铁矿区及周边农田土壤中重金属Cd、Pb的质量分数及其各形态质量分数进行了分析,用Hakanson潜在生态危害指数法进行了潜在生态风险评价,并以ArcGIS空间分析技术绘制了实验区域土壤中Pb、Cd及其有效态质量分数的空间分布图.结果表明Cd、Pb有效态质量分数各占其质量分数的34.4%和17.8%,相对于Pb,Cd具有较高的生态风险.以重金属Cd、Pb有效态质量分数进行潜在生态风险评价能够准确反映出土壤重金属的污染程度,而以重金属Cd、Pb的质量分数进行评价会夸大潜在生态风险.In the present study,the mass fraction and speciation of heavy metals Cd and Pb in the soil of Yunfu Pyrite area were determined by Tessier sequential extraction method.The potential ecological risk assessment was also carried out using the method of Hakanson index method.The concentrations of Cd and Pb and their mass fractions,as well as their spatial distribution were made by using ArcGIS spatial analysis techniques.The results reveal that the available mass fractions of Cd and Pb were about 34.4% and 17.8% of the total mass fraction,respectively,which possessed higher ecological risk by comparing with Pb and Cd.Taken together,the results show that the potential ecological risk assessment based on available mass fraction could more precisely reflect the pollution situation of heavy metals.However,exaggerated potential pollution risk would be made if it just bases on total metal mass.

关 键 词：云浮硫铁矿 重金属形态分布 潜在生态风险评价 GIS 

分 类 号：X53[环境科学与工程—环境工程]