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| Effect of climate conditions in arid area on accumulation of Pd , Rh in dust and soil from road environment |
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Abstract Seasonal variation characteristics of Pd and Rh (PGEs) in dust/soil collected from 5 typical urban roads including Hetan Road, South Youhao Road, West Wenquan Road, Wukui Expressway, and Qidaowan Road in Urumchi were analyzed. There was a significant seasonal variation in the average concentrations of PGEs. In Spring, Summer, Autumn and Winter, the concentrations of Pd in dust were 74.61(31.59~126.3)ng/g,134.26(54.59~332.51)ng/g, 100.49 (20.935~244.9)ng/g and 83.43(47.97~125.40)ng/g respectively (presented as means with minimum ~ maximum values in parenthesizes); values of Rh in dust were 8.41 (4.56~14.63)ng/g, 18.48(11.62~31.56)ng/g, 10.27(3.83~19.1)ng/g and 9.20(5.34~16.68)ng/g, respectively; Pd concentrations in soil were 44.42(13.59~109.40)ng/g, 30.47(13.24~70.87)ng/g, 30.01(21.55~49.19)ng/g, and 26.28(14.85~44.83)ng/g; Rh values in soil were 8.47 (5.93~13.40)ng/g, 8.11(4.65~ 13.45)ng/g, 3.81(1.67~8.02)ng/g and 3.22(2.56~4.26)ng/g seasonally. The concentrations of PGEs in dust were higher in summer and autumn, lower in spring and winter, which were disagreed with those in soil. These differences could be caused by snowfall, snow sweeping, and snow accumulation in Urumchi. Seasonal variations of PGEs in arid area were different from humid area which were mainly caused by differences of climate conditions.
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Received: 10 January 2011
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