State Key Laboratory of Urban Water Resources and Water Environment

54 road-deposited sediments(RDS) samples from heavy traffic area,Da Shi Kou square,Riverside Park,commercial areas,residential areas,district of culture and education in old city of Zhenjiang were analyzed for Cu,Pb,Zn,Ni,Cr,Cd,Mn.The results indicated that the level of Cu,Ni,Cr,Mn,Cd in the heavy traffic areas was significantly higher than other areas.The level of Zn was the highest in the district of culture and education,and the level of Pb was the highest in the residential areas.Index of geo accumulation(Igeo) showed that the levels of Cd in the heavy traffic areas and district of culture and education are high level pollution,and the levels of Zn in the district of culture and education are also high level pollution.Potential ecological risk assessment indicated that the potential ecological hazard index for the heavy traffic areas,Da Shi Kou square,district of culture and education are of medium ecological hazard;and the potential ecological risk index for Riverside Park,commercial areas,residential areas are of light ecological hazard.