三峡上游河流沉积物中重金属污染生态风险评价  

Pollution characteristics and risks of heavy metals of sediments from rivers in upper three gorges

作　　者：李永峰[1] 曹政[1] 刘方婧[1] 程国玲[1] 

机构地区：[1]东北林业大学林学院,哈尔滨150040

出　　处：《哈尔滨商业大学学报（自然科学版）》2012年第5期527-531,共5页Journal of Harbin University of Commerce：Natural Sciences Edition

基　　金：环境保护部环保行业公益性科研项目(200909043)

摘　　要：调查了三峡上游长江干流、长江一级支流岷江、沱江和嘉陵江、二级支流渠江和涪江河流表层沉积物中8种重金属的质量比及其不同形态组成,并探讨了沉积物重金属污染的生态风险.研究结果表明,沉积物中8种重金属质量比与三峡上游区域土壤背景值相近,污染程度较轻,其中Cd、Cu和Hg有一定程度污染.沉积物中不同重金属形态分布迥异,Cd的生物可利用态质量比最高,其次为Zn、Ni和Cr.三峡上游区域内重金属污染为强度、中度和轻度生态危害水平的区域分别占5%、37%和58%,表明内河流沉积物中其他重金属的污染程度不高,处于较安全的状态.The content and speciation of 8 heavy metals in surface sediments from the 6 rivers located in upper Three Gorges,southwest China,were investigated.Furthermore,the risks of heavy metals were discussed.With the 8 metal levels all close to their background values in soil environment in upper rivers of Three Gorges,the light pollutions were occurred in these rivers.Among of the 8 metals,Cd,Cu and Hg were to some extent accumulated in these riverine sediments.These 8 metals distributed with different speciation in riverine sediments.The percent of the form of available speciation was found largest in Cd in sediments,followed by Zn,Ni and Cr.The percentages for strong,moderate and light ecological risks were calculated to 5%,37% and 58%,respectively,suggest a safe status for heavy metals in this zone

关 键 词：河流沉积物 重金属 形态 生态风险 

分 类 号：X830[环境科学与工程—环境工程]