太湖竺山湾湿地表层沉积物重金属的分布特征及其污染评价  

Distribution Characteristics and Pollution Assessment of Heavy Metals in the Surface Sediments in Zhushan Bay

作　　者：黄玉洁[1] 张银龙[1] 李文朝[2] 方颖[3] 杨均科[1] 孙雅辉[1] 

机构地区：[1]南京林业大学森林资源与环境学院,江苏南京210037 [2]中国科学院南京地理与湖泊研究所,江苏南京210008 [3]环境保护部南京环境科学研究所,江苏南京210042

出　　处：《江西农业大学学报》2011年第3期608-615,共8页Acta Agriculturae Universitatis Jiangxiensis

基　　金：林业公益性科研专项(200904001-3);江苏省环保科研项目(2008013);江苏省高校自然科学研究重大项目(09KJA180002)

摘　　要：为研究太湖竺山湾湿地沉积物重金属的污染状况,采样分析表层沉积物中As、Cd、Cr、Cu、Ni、Pb、Zn 7种重金属的含量,并运用地累积指数法和潜在生态风险指数法对其污染程度和潜在生态危害进行评价,结果表明:As、Cd、Cr、Cu、Ni、Pb、Zn的平均值分别为123.32、2.61、160.24、176.78、183.09、30.12和269.61 mg/kg,都明显高于各自的背景值;地累积指数法评价结果显示,As、Cd的污染程度比较严重,Zn的污染基本上为中等程度,Cr、Pb基本上为轻微污染,研究区不同程度地受到Cu和Ni的污染;潜在生态风险指数法评价显示,研究区大约80%的区域处于强与很强的危害程度,对潜在生态风险指数贡献最大的是Cd,其次是As,说明造成研究区重金属潜在危害的主要元素是As和Cd。For studying the pollution condition of heavy metals of the wetland sediments in Zhushan Bay of Taihu lake,the contents of As,Cd,Cr,Cu,Ni,Pb and Zn in the surface sediments were measured and the pollution degree and the potential ecological harm of heavy metals were analyzed and assessed by using the methods of Geo-accumulation index and potential ecological risk index.The results showed： The average contents of As,Cd,Cr,Cu,Ni,Pb and Zn were 123.32,2.61,160.24,176.78,183.09,30.12 and 269.61 mg/kg respectively,which were all higher than their background values.The Geo-accumulation index method indicated that As and Cd reached the serious pollution level,Zn was at the moderate pollution level, Cr and Pb reached the lower pollution level,Cu and Ni pollution had different pollution levels in the studied area.The ecological risk index method indicated that about 80% of the studied area reached severe and very severe harm degree and Cd was the main element of potential harm,the follower was As in the studied area.

关 键 词：表层沉积物 重金属 分布特征 污染评价 太湖竺山湾 

分 类 号：X524[环境科学与工程—环境工程]