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Title: Metal contamination in urban, suburban, and country park soils of Hong Kong : a study based on GIS and multivariate statistics
Authors: Lee, CSL
Li, X 
Shi, W 
Cheung, SCN
Thornton, I
Keywords: Urban soil
Heavy metals
Multivariate statistic
Pb isotope
Hong Kong
Issue Date: 1-Mar-2006
Publisher: Elsevier
Source: Science of the total environment, 1 Mar. 2006, v. 356, no. 1-3, p. 45-61 How to cite?
Journal: Science of the total environment 
Abstract: The urban environment quality is of vital importance as the majority of people now live in cities. Due to the continuous urbanisation and industrialisation in many parts of the world, metals are continuously emitted into the terrestrial environment and pose a great threat on human health. An extensive survey was conducted in the highly urbanised and commercialised Hong Kong Island area (80.3 km²) of Hong Kong using a systematic sampling strategy of five soil samples per km² in urban areas and two samples per km² in the suburban and country park sites (0–15 cm). The analytical results indicated that the surface soils in urban and suburban areas are enriched with metals, such as Cu, Pb, and Zn. The Pb concentration in the urban soils was found to exceed the Dutch target value. The statistical analyses using principal component analysis (PCA) and cluster analysis (CA) showed distinctly different associations among trace metals and the major elements (Al, Ca, Fe, Mg, Mn) in the urban, suburban, and country park soils. Soil pollution maps of trace metals (Cd, Co, Cr, Cu, Ni, Pb, and Zn) in the surface soils were produced based on geographical information system (GIS) technology. The hot-spot areas of metal contamination were mainly concentrated in the northern and western parts of Hong Kong Island, and closely related to high traffic conditions. The Pb isotopic composition of the urban, suburban, and country park soils showed that vehicular emissions were the major anthropogenic sources for Pb. The [sup 206]Pb/[sup 207]Pb and [sup 208]Pb/[sup 207]Pb ratios in soils decreased as Pb concentrations increased in a polynomial line (degree=2).
ISSN: 0048-9697
EISSN: 1879-1026
DOI: 10.1016/j.scitotenv.2005.03.024
Rights: Science of the Total Environment © 2005 Elsevier. The journal web site is located at
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