环太湖河流沉积物重金属污染及其稳定度分析  

Heavy Metals Pollution and Its Stability Assessment of Sediments in Flowing Rivers Around Lake Taihu

作　　者：卢少勇[1] 焦伟[1,2] 金相灿[1] 远野[1] 张烨[1,3] 李光德[2] 

机构地区：[1]中国环境科学研究院湖泊环境研究中心,国家环境保护湖泊污染控制重点实验室,北京100012 [2]山东农业大学,泰安271000 [3]北京科技大学土木与环境工程学院,北京100083

出　　处：《环境科学》2010年第10期2311-2314,共4页Environmental Science

基　　金：国家水体污染控制与治理科技重大专项(2008ZX07101;2009ZX07101);国家高技术研究发展计划(863)项目(2005AA60101005);国家重点基础研究发展规划(973)项目(2008CB418200)

摘　　要：以16条环太湖主要进出河流为研究对象,采用BCR三步连续提取法测定了其河口表层沉积物中Pb、Cd、Cu及Zn这4种重金属含量,分析了其污染程度、分布特征和稳定度,旨在为合理预防和治理太湖重金属污染提供依据.结果表明,本次调查的16条环太湖河流河口的沉积物都受到不同程度的重金属污染,4种重金属在大多数采样点的含量均超过临界效应浓度值(TEL);诸河口表层沉积物中重金属可提取态含量分布有明显差异性:北部河流>南部河流,入湖河流>出湖河流;4种重金属的稳定程度依次为:Cd<Zn<Pb<Cu,因此相对于元素Pb和Cu,元素Cd和Zn有更高的二次释放潜力及潜在生态危害.16 main inflow and outflow rivers around Lake Taihu were chosen as the research object,and the concentrations and distribution of four heavy metals（Pb,Cd,Cu and Zn） in the surface sediments of these river estuaries were detected.The pollution extent and stability were analyzed by using three-step sequential extraction method（BCR method）.Aim of this study is to control heavy metal pollution of Lake Taihu and provide the basic information.Based on the results,the monitored river estuaries all had been contaminated by different degrees,and four heavy metals＇ concentrations all exceeded the threshold effect level（TEL） at most sampling sites.A distinct spatial heterogeneity was found in extracted fractions of these heavy metals distribution：northern rivers southern rivers,inflow rivers outflow rivers.The Stability Assessment Code（SAC） for different metals varied in the descending order of Cd,Zn,Pb and Cu.Compared with Pb and Cu,Cd and Zn had a higher second release potential and ecological risk.

关 键 词：太湖 河口 沉积物 重金属污染 稳定度 

分 类 号：X522[环境科学与工程—环境工程]