Access of Heavy Metals Pollution of Changshouhu in Chongqing,China

Heavy metals are mainly carried in sediments of water body,their concentrations play an important role on environmental quality of the water body.The concentrations of eight heavy metals(Pb,Cd,Cu,Zn,Cr,Ni,Hg and As)from surface sediments of Changshouhu were analyzed.The results showed that the surface sediments of Changshouhu were polluted mainly by Cd,Hg and As compared with the Environ-mental quality standard for soils,and the intensity of heavy metals pollution of middle area was higher than that of eastern and western area.According to the correlation analysis of various heavy metals,there was a remarkable correlation between Cu,Ni and Zn,which suggested they might have the same origin.Based on the potential ecological risk assessment results,the surface sediments of Changshouhu had reached a low ecological risk level,and the degree of ecological risk of different heavy metals in surface sediments in descending order was HgCd AsPbNiCuCrZn.Ecological risk index presented by Hakanson to assess the potential ecological risk of Changshouhu was utilized,and some countermeasures for controlling of heavy metals pollution were set forth.Aim of this study is to pretend and control heavy metals pollu-tion of Changshouhu.