Journal
ENVIRONMENTAL POLLUTION
Volume 159, Issue 5, Pages 1317-1326Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2011.01.013
Keywords
Urban soil contamination; Human health risk assessment; Particle size fractions; Bioaccessibility; Sources identification
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Funding
- Sustainable Urbanization Research Fund (SURF) from the Faculty of Construction
- Hong Kong Polytechnic University [1-ZV4M]
- Chinese Academy of Sciences
- National Natural Science Foundation of China [40871244, 21007065]
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The concentration and loading distribution of trace metals (Cu, Zn, Pb, Co, Ni, Cr, and Mn) and major elements (Al, Ca, Fe, and Mg) in different particle size fractions (2000-280, 280-100,100-50, 50-10,10-2, and <2 mu m) of surface soils from highly urbanized areas in Hong Kong were studied. The enrichment of Pb, Cu, and Zn in the urban soils was strongly influenced by anthropogenic activities, and Pb accumulated in fine particles was mainly derived from past vehicular emissions as shown by Pb isotopic signatures. Trace metals primarily accumulated in clay, fine silt, and very fine sand fractions, and might pose potential health risks via the inhalation of resuspended soil particles in the air (PM(10) or PM(2.5)), and ingestion of adhered soils through the hand-to-mouth pathway. The mobility, bioavailability, and human bioaccessibility of Pb and Zn in bulk soils correlated significantly with metal concentrations in fine silt and/or very fine sand fractions. (C) 2011 Elsevier Ltd. All rights reserved.
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