太湖底泥中重金属污染及潜在生态危害评价  

Pollution of Heavy Metals in the Bottom Mud of Lake Taihu and Its Assessment of Potential Ecological Risk

作　　者：向勇[1] 缪启龙[1] 丰江帆[2] 

机构地区：[1]南京信息工程大学资源环境与城乡规划系,江苏南京210044 [2]南京师范大学地理科学学院,江苏南京210097

出　　处：《南京气象学院学报》2006年第5期700-705,共6页Journal of Nanjing Institute of Meteorology

基　　金：国家自然科学基金资助项目(40075021)

摘　　要：以太湖底泥为研究对象,分析太湖底泥中重金属的含量分布及富集状况,采用LarsHaKanson潜在生态危害指数法对重金属的生态危害进行了评价。结果表明:各种重金属的含量分布呈现一定的区域特征,太湖湖岸区平均含量明显高于湖心区,从富集系数来看,Pb的富集程度最高,其次是Zn、Cu、As、Cr、Hg、Cd。太湖底泥重金属的潜在生态危害评价显示,除无锡片区犊山口Hg的污染属于中等生态危害外,其他各点重金属的生态危害都相对轻微,污染程度顺序为Hg>Cd>Pb>As>Cu>Zn>Cr。Concentrations, distribution and enrichment of heavy metals in the bottom mud of Lake Taihu are investigated. The method of potential ecological risk index presented by Lars HǎKanson is used to assess the ecological risk of heavy metal pollution. The results indicate that the distribution of various heavy metal contents appears a regional distributive character, i. e. the mean contents of heavy metals are relatively high in the field of lakeshore and low in the center. Among these heavy metals, the enrichment of Pb appears highest and the others appear lower. The order of the enrichment degree of heavy metals in the bottom mud of Lake Taihu is Pb 〉 Zn 〉 Cu 〉 As 〉 Cr 〉 Hg 〉 Cd. The assessment results of ecological risk reveal that except Hg pollution in Du Shan-kou belongs to moderate potential ecological risk, all the others belong to light potential ecological risk. The order of the polluting degree of heavy metals in the bottom mud of Lake Taihu is Hg 〉 Cd 〉 Pb 〉 As 〉 Cu 〉 Zn 〉 Cr.

关 键 词：太湖 重金属 底泥 生态危害评价 

分 类 号：X524[环境科学与工程—环境工程]