Pollution and risk assessment of heavy metals in surface sediment of south Bohai

The contents of 5 heavy metals(Cr,Cu,Zn,Cd and Pb) in surface sediment of 21 sampling sites were detected by ICP/MS to analyze the origin and distribution profile of heavy metal in south of Bohai.The Hakanson method was applied to assessment the potential ecological risk in this area.The results showed that the concentration of Cr,Cu,Zn,Cd and Pb were 43.67,17.27,61.65,0.66 and 25.32 mg/kg respectively.The single-factor potential ecological risk of heavy metals in surface sediment was in a lower pollution degree,and they were in order of CdPbCuCrZn.The composite risk assessment index was lower than 150,belonging to low level condition,and the isoline map of the potential ecological risk index showed that the Bay of Bohai belonged to higher ecological risk compared to the other areas.