Atmospheric environment

Distribution of Platinum group elements in road dust in the Beijing metropolitan area, China

WANG Juan , ZHU Ruo-hua , SHI Yan-zhi


Received December 14, 2005,Revised April 20, 2006, Accepted , Available online

Volume 19,2007,Pages 29-34

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Dust samples collected from the Beijing metropolitan area (China) were evaluated for the distribution of platinum group elements (PGEs) concentrations. The dust < 100 mesh size fraction (150 μm) was analyzed after aqua regia digestion. Concentrations of Pt, Rh and Pd were found between 3.96-356.3, 2.76-97.11 and 0.1-124.9 ng/g, respectively, while for the samples collected from suburban as the background were very low in the ranges of 0.1-0.9 ng/g for Pt, 0.5-1.4 ng/g for Pd and 0.8-2.2 ng/g for Rh, respectively. The distributions of PGEs from road dust reflect the pollution most adequately matching the local traffic conditions. A strong positive correlation between all elements contents determined in road dusts is established. This suggests that emissions of abraded fragments from vehicles exhausts may be the source of the high values and geographic distributions of Pt, Rh and Pd in road dust along Beijing main roads.

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