The Distribution and Its Risk of Pb in Different Functional Area——A Case Study of Guiyang City

In this study,Guiyang City was chosen to study the influence of different functional areas of the city to the level of Pb in dusts by collecting dust samples from different functional areas of the city and analyzing the total Pb in dusts and Pb contents of dusts with different sizes.The result showed that the geometric mean concentration of Pb in dusts of Guiyang was 93.2mg/ kg.Large variations in Pb levels were found in dusts in industrial area and garbage stations,while light variations in commercial area and traffic area.Dusts in industrial area contained significantly higher concentrations of Pb than both in commercial area and garbage stations,and dusts in city square and school area contained significantly higher concentrations of Pb than both in commercial area and traffic area,while dusts in residential area contained significantly higher concentrations of Pb than in traffic area.With respect to street dust particle size,the level of Pb in different functional area were difference,and Pb was primarily associated with middle and coarse particles in most functional area but the contribution of Pb from 250μm particle size factions were both nearly 80% in all function area.