镇江市老城区不同功能区地表灰尘重金属污染评价

通过采集江苏省镇江市老城区的交通区、大市口广场、江滨公园、商业区、居民区、文教区等不同功能区地表灰尘共54个样品,对其Cu、Pb、Zn、Ni、Cr、Cd、Mn 7种重金属进行分析测定.结果表明,交通区Cu、Ni、Cr、Mn、Cd的平均含量要明显高于其它功能区,Zn的含量在文教区最高,Pb的含量在居民区最高.地累积指数评价表明交通区、文教区两个功能区中Cd达偏重度污染,文教区中Zn也达偏重度污染;潜在生态风险评价结果表明,交通区、大市口广场、文教区3个功能区的潜在生态风险指数均为中等生态危害;江滨公园、商业区、居民区3个功能区的潜在生态风险指数均为轻微生态危害.

Assessment of heavy metal contamination in road-deposited sediment from different functional district of Zhenjiang

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.