Assessment of Heavy Metal Pollution of Dustfall in Xi'an City, Northwest China
Proceedings of the 2016 International Conference on Advanced Materials Science and Environmental Engineering
Air pollution caused by Atmospheric Particulate Matter (APM) and its impacts have become one of the most important challenges for public health and environmental quality in China since 2000s. Here we report a study of heavy metal pollution in atmospheric deposition in Xi'an city. Dustfall samples were wet collected by the gravimetric method at four sampling stations located in different functional districts of city month by month in 2014. The concentration of heavy metal such as Pb, Zn, Cu, Cr,
... as Pb, Zn, Cu, Cr, Ni and Cd was analyzed with ICP-MS and the atmospheric heavy metals deposition were calculated simultaneously. The results indicated that the annual average dustfall flux in industrial district, commercial district, cultural and educational district and scenic zone was 17.84 t/(km 2 ·30d), 15.99 t/(km 2 ·30d), 15.46 t/(km 2 ·30d) and 11.76 t/(km 2 ·30d), much higher than the limits of foreign related standards, which showed that the dustfall pollution in Xi'an city was serious. Furthermore, the annual average concentration of Pb, Zn ,Cu ,Cr, Ni, Cd bounded with dustfall was 438.1 mg/kg, 454.9 mg/kg, 61.1 mg/kg, 149.5 mg/kg, 41.4 mg/kg and 7.8 mg/kg respectively, which was 20.5, 6.6, 2.9, 2.4, 1.4 and 83.0 times of the soil background value in Shaanxi province. Pollution of Pb, Cr and Cd was serious and enriched distinctly. The calculated atmospheric heavy metal deposition of Pb, Zn, Cu, Cr, Ni and Cd was 81.35 mg/(m 2 ·a), 84.47 mg/(m 2 ·a), 11.35 mg/(m 2 ·a), 27.76 mg/(m 2 ·a), 7.69 mg/(m 2 ·a) and 1.45 mg/(m 2 ·a) respectively.