江苏省徐州市区街道灰尘重金属污染分析与评价

对江苏省徐州市区街道灰尘中Pb,Cd,Cu,Zn的含量水平进行了研究。结果表明,市区街道灰尘中Pb,Cd,Cu,Zn的平均含量分别为440.8,2.48,76.2,382.2 mg/kg,是徐州市土壤背景值的27.0,8.6,6.0,4.2倍;与国内其他城市街道灰尘重金属平均含量相比,上述重金属元素平均含量处于中等—偏高水平。采用地积累指数法和潜在生态危害指数法进行评价,结果表明,Pb处于重污染水平,Cd和Cu处于中度污染水平,Zn处于偏中度污染水平;市区街道灰尘重金属的潜在生态危害达到了强生态危害水平,在4种重金属中,Pb和Cd对街道灰尘的潜在生态危害贡献较大。通过研究以期为徐州市的城市环境污染防治和城市规划提供重要的科学依据。

The contents of Pb, Cd, Cu and Zn in urban street dust in Xuzhou city of Jiangsu province results showed that the average contents of Pb,Cd, Cu and Zn were 440.8 mg/kg,2.48 mg/kg, 76.2 mg/kg are studied. The and 382.2 mg/kg, which are 27.0,8.6,6.0 and 4.2 times of the soil background value in Xuzhou City. Compared with other domestic cities, the average contents of the above heavy metals were at medium-higher levels. By using the method of geoaccumulation index and potential ecological risk index to assess the heavy metal pollution in urban street dust of Xuzhou,the results show：Pb is at a heavy pollution level, Cd and Cu are at a middle pollution level, Zn is at below middle pollution level. The potential ecological risk of urban street dust of Xuzhou reaches to strong ecological hazard level; among the four heavy metals, Pb and Cd make the main contribution to the potential ecological risk of urban street dust. The results are expected to provide important scientific basis for the urban environmental pollution control and city planning of Xuzhou city.