Pollution and Assessment of Heavy Mental Status in Sediments in Chongqing Urban Section of Three Gorges Project after Impoundment

The Pollution characteristics of heavy metals in sediment of Chongqing urban section of Three Gorges Reservoir after impoundment were investigated and analyzed by assessing the geoaccumulation index and the potential ecological risk of actural measurement of eight monitoring stations(Lijiatuo,Egongyan,Huangshaxi,Shanhuba,Dafosi(Cuntan),Huanghuayuan,Hualongqiao,Ciqikou).The results showed that the average contents of Cd and Pb in the sediment of Chongqing urban section are 1.83mg/Kg and 98.14mg/Kg in Yangtze River and 1.28mg/Kg and 28.80mg/Kg in Jialing River respectively, which all surpass the soil background value of Chongqing. The enrichment degree of heavy mental was Cd>Pb. According to the evaluation based on the soil background value of Chongqing, the pollution of Pb in all monitoring stations was low; the pollution of Cd in Lijiatuo、Egongyan、Huangshaxi and Shanhuba was moderate and the rest was low.