Pt and Pd concentrations and source in urban roadside soils from Xuzhou,China |
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| Authors: | Xue Song Wang Cheng Sun |
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| Institution: | (1) School of the Environment, Nanjing University, 210093 Nanjing, China;(2) Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang, China |
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| Abstract: | This investigation represented the preliminary study to characterize Pt and Pd concentrations and enrichment ratios in urban
roadside soils. Roadside soil samples were analyzed by ICP-MS. Data from 21 roadside topsoil samples show medians of Pt and
Pd concentrations are 2.9 and 2.8 ng g−1, respectively. These values are higher than those of upper crust that average 0.4 and 0.4 ng g−1, respectively. The relatively lower Pt and Pd concentrations are expected due to recent introduction of catalysts to China
compared to the prolonged use of catalysts in Europe. Hierarchical clustering analysis indicates that Pt and Pd in Xuzhou
urban roadside soils were mainly from the traffic emissions. Computation of enrichment ratios using the upper crust values
as background levels suggests that the roadside soils had enrichment medians of 6.4 for Pt (range 2.5–11.75) and of 6.75 for
Pd (range 2.75–9.25). Lower Pt/Pd ratios (range 0.35–2.86) in relation to similar studies in other countries were observed
due to the different automobile catalytic converters. In general, fine fraction (<250 μm) contains higher Pt and Pd concentrations
compared to the coarse fraction (250–500 μm). |
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| Keywords: | Pt Pd Urban roadside soil Hierarchical cluster analysis Xuzhou |
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