摘要
对三峡水库实验性蓄水172 m回落至166 m后入库支流大宁河回水淹没迁建区浸没土壤、消落带土壤和172 m以上背景土壤中重金属含量进行了测定,该地区Cu,Pb的平均含量较高,Zn,Cr的污染最为严重。地累积指数法评价结果显示,Cu、Pb、Zn、Cr的相对污染程度较高,Cd处于较为清洁状态。重金属元素污染程度排序为Cr>Zn>Pb>Cu>Cd。生态风险评价结果表明该地区Cr为极强生态危害等级;Cu,Cd,Pb为低生态风险;Zn为中等或强生态风险等级,生态危害程度的排序为Cr>Zn>Cd>Pb>Cu。
Contents of heavy metal such as Cu,Cr,Pb,Zn and Cd in the submerged soils,wet-dry zone soils and non-submerged soils of the Three Gorges Reservoir were determined.Results indicated that the contents of Cu,Pb,Cd were relatively lower,but Zn,Cr were higher.Results of pollution assessment by index of geoaccumulation showed that the pollution degrees of heavy metal pollutants in the sediments were in the sequence as Cr,Zn,Pb,Cu and Cd.Ecological risk assessment indicated that the order of ecological risk was as Cr,Zn,Cd,Pb and Cu.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2011年第4期81-85,139,共6页
Environmental Science & Technology
基金
国家重点基础研究发展规划(973)项目(2007CB407306)
关键词
三峡水库回水区
沉积物
重金属
分布
污染评价
backwater reach of the Three Gorges Reservoir
sediments
heavy metal
distribution
pollution assessment
