滇池沉积物中重金属的形态分布特征  

Form Distribution of Heavy Metals in Sediment of Dianchi Lake,Yunnan Province

作　　者：李仁英[1] 杨浩[2] 王丽 彭丹[4] 

机构地区：[1]南京信息工程大学应用气象学院,南京210044 [2]南京师范大学地理科学学院,南京210097 [3]山东省新泰市青云街道办事处,山东新泰271200 [4]土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所),南京210008

出　　处：《土壤》2008年第2期264-268,共5页Soils

基　　金：江苏省社会发展科技计划项目(BS2006060);江苏省高等学校大学生实践创新训练计划项目;南京信息工程大学科研启动项目

摘　　要：本文利用BCR三步提取法对滇池沉积物中的重金属(Cd、Cr、Cu、Pb和Zn)形态进行了详细研究。结果表明,表层沉积物中的Cd和Zn主要以可提取态(即弱酸溶解态、可还原态和可氧化态)存在,其中,Cd在弱酸溶解态、可还原态和可氧化态中的含量分别为35.0%、49.7%和12.9%;Zn在三者中的含量也分别达到了17.6%、16.6%和21.4%。而Cr、Cu和Pb主要以残渣态存在,其含量分别为88.5%、59.2%和81.8%。表层沉积物中可提取态重金属的空间分布特征为草海含量最高,其次为外海北部和南部,开阔湖中心区域含量最低。除Cr和Cu外,其他可提取态重金属的总含量随着采样深度的增加而减少。Abstract： Form distribution of heavy metals （Cd, Cr, Cu, Pb and Zn） in the sediment of Dianchi Lake was studied using the three-step sequential extraction method （BCR method） in this study. The results showed that Cd and Zn mainly occurred in the fractions extracted by BCR method, namely, weak soluble fraction, reducible fraction and oxidisable fraction, which were 35.0%, 49.7 and 12.9% for Cd, 17.6%, 16.6% and 21.4% for Zn, respectively, in surface sediment. While Cr, Cu and Pb mainly occurred in residual fraction, which were 88.5%, 59.2% and 81.8%, respectively. Total content of fractions extracted for heavy metals in surface sediment was higher in Caohai section than the north and the south of Waihai, and was the lowest in the center of the lake. Except for Cr and Cu, the content of heavy metals in the fractions extracted by BCR method decreased with the increase of depth.

关 键 词：滇池 沉积物 重金属 BCR 形态 

分 类 号：X524[环境科学与工程—环境工程]