有色冶金区街道灰尘中As和Pb的空间分布特征及其生态风险

Spatial Distribution and Environmental Risk of As and Pb from Street Dust in Non-ferrous Metals Smelting Areas

应用ArcGIS地统计学方法研究了葫芦岛市有色冶金区街道灰尘中As、Pb的含量水平和空间分布特征,并采用地积累指数法和潜在生态危害指数法对样品中As、Pb的生态风险进行评价.结果表明,葫芦岛市街道灰尘中As和Pb的平均含量为33.10 mg.kg-1、533.2 mg.kg-1,分别是辽宁省土壤环境背景值的4倍、25倍;As、Pb分布呈现出以锌厂周围为中心向四周呈辐射状扩散的空间分布格局;葫芦岛市锌厂附近街道灰尘中As、Pb污染严重,潜在生态危害最高级别分别为很强、极强生态危害,Pb污染比As污染严重.

ArcGIS analysis was applied to study the content level and the spatial distribution characteristics of As and Pb in street dust of Huludao city.Geoaccumulation Indexes and Potential Ecological Risk Index technique were applied to assess the ecological risk of As and Pb.The average contents of As and Pb were 33.10 mg.kg-1 and 533.2 mg.kg-1,which was 4 and 25 times as high as the background value respectively.The trends for Pb and As were similar with higher concentrations near Huludao Zinc Plant（HZP）.The ecological risk of As and Pb contamination in street dust were serious,and the accumulation of Pb in street dust was higher than the As.