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Title: The study of metal contamination in urban soils of Hong Kong using a GIS-based approach
Authors: Li, Xiangdong
Lee, Siu-lan
Wong, Coby Sze-chung
Shi, Wenzhong
Thornton, Iain
Subjects: Urban soil
Heavy metals
Pb isotope
Hong Kong
Issue Date: May-2004
Publisher: Elsevier
Source: Environmental pollution, May 2004, v. 129, no. 1, p. 113-124.
Abstract: The study of regional variations and the anthropogenic contamination by metals of soils is very important for environmental planning and monitoring in urban areas. An extensive survey was conducted in the highly urbanized Kowloon area (46.9 km²) of Hong Kong, using a systematic sampling strategy with a sampling density of 3–5 composite soil samples (0–15 cm) per km². Geochemical maps of ‘total’ metals (Cd, Cr, Cu, Ni, Pb and Zn) from strong acid extraction in the surface soils were produced based on geographical information system (GIS) technology. A significant spatial relationship was found for Ni, Cu, Pb and Zn in the soils using a GIS-based analysis, suggesting that these metal contaminants in the soils of the Kowloon area had common sources. Several hot-spot areas of metal contamination were identified from the composite metal geochemical map, mainly in the old industrial and residential areas. A further GIS analysis revealed that road junctions, major roads and industrial buildings were possible sources of heavy metals in the urban soils. The Pb isotope composition of the contaminated soils showed clear anthropogenic origins.
Rights: Environmental Pollution © 2003 Elsevier. The journal web site is located at
Type: Journal/Magazine Article
DOI: 10.1016/j.envpol.2003.09.030
ISSN: 0269-7491
Appears in Collections:CEE Journal/Magazine Articles
LSGI Journal/Magazine Articles

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