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Title: Pb contamination and isotopic composition of urban soils in Hong Kong
Authors: Wong, CSC
Li, X 
Keywords: Pb contamination
Pb isotope
Chemical partitioning of Pb
Urban soils
Hong Kong
Issue Date: 5-Feb-2004
Publisher: Elsevier
Source: Science of the total environment, 5 Feb. 2004, v. 319, no. 1-3, p. 185–195 How to cite?
Journal: Science of the total environment 
Abstract: In the urban environment, intense human activities can lead to degradation of environmental quality and have potential long-term effects on human health. In the present study, Pb contamination of urban soil cores in Hong Kong was investigated using a combination of the ‘total’ concentration, chemical partitioning and isotopic composition of Pb in the soils. The analytical results showed that urban soil cores in close vicinity to high traffic volumes (>40 000 vehicles per day) were usually contaminated with Pb, suggesting atmospheric deposition of Pb as a consequence of vehicular emissions arising from the combustion of leaded gasoline in the past. Increasing Pb concentrations were generally associated with decreasing [sup 206]Pb/[sup 207]Pb ratios of the contaminated soil cores, offering strong evidence of accumulation of Pb derived from anthropogenic sources. In selected contaminated soil cores, the [sup 206]Pb/[sup 207]Pb ratios tended to increase in the order: carbonate<exchangeable<Fe–Mn oxide<organic<residual fractions. The distribution of the [sup 206]Pb/[sup 207]Pb ratios in the five operationally defined chemical fractions showed that the [sup 206]Pb/[sup 207]Pb ratios generally increased with increasing stability, demonstrating preferential association of anthropogenic Pb with the carbonate, exchangeable, Fe–Mn oxide and organic fractions in the soils.
ISSN: 0048-9697
DOI: 10.1016/S0048-9697(03)00403-0
Rights: Science of the Total Environment © 2003 Elsevier. The journal web site is located at
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