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http://dx.doi.org/10.9719/EEG.2012.45.1.009

Geochemical Characteristics and Trace Metal Speciation of Soils in Major Source Area of Asian Dust  

Lee, Pyeong-Koo (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
Youm, Seung-Jun (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
An, Gi-O (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Economic and Environmental Geology / v.45, no.1, 2012 , pp. 9-21 More about this Journal
Abstract
In this study, we investigated the chemical characteristics of soils collected from the several deserts and loess in China known as the typical source areas of Asian dust (the Taklamakan desert, the Alashan desert, the Ordos desert and the Loess Plateau). Based on our analysis, we examined the possibility of adverse effects on environments and human health. In each desert and loess, major elemental compositions of soils did not show large variations, implying that the long-periodic mixing of soils in each area made their chemical compositions homogeneous. Minor elements of soils in each desert and loess showed more complicated patterns with strong correlations each other (e.g., Cr, Cu, As, Co, Ni, V, Y, Sc, Sn, Pb, Zn, Cd, Cs, Li, Th, U). These results thus enable us to discriminate the soil of the Loess Plateau from those of the other deserts in China. The results of sequential extraction experiments for soils showed that the chemical speciation of Fe was dominant in residual fraction (>85%) in all deserts and loess, but the fractions of Mn and Ca chemical speciations were very different in each area. In the case of Mn, the fraction of amorphous Fe-Mn hydroxides (55.4%) in the Central Loess Plateau and the carbonate fraction (33.8%) in Taklamakan desert were higher as much as 2 to 5 times than other deserts. The chemical speciations of Ca are dominant in carbonate fraction in Taklamakan (75.9%) and Alashan (50.5%) deserts, but carbonate fractions of Ca in the Loess Plateau and Ordos deserts were low (6.6% and 2.1%, respectively). According to the mobility of trace elements inferred from the results of sequential extraction procedure, we could classify them into five groups, and the mobility of Cd, Pb and Cu are more than 87%, 33% and 30%, respectively. Therefore, Cd, Pb and Cu in soils of deserts and loess could be easily dissolved when interacted with surface water. As such, they could give adverse effects on surficial environments and human health.
Keywords
Asian dust; source areas; soils of desert & loess; geochemical characteristics;
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Times Cited By KSCI : 8  (Citation Analysis)
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