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The mobility, bioavailability, and human bioaccessibility of trace metals in urban soils of Hong Kong

, : The mobility, bioavailability, and human bioaccessibility of trace metals in urban soils of Hong Kong. Applied Geochemistry 27(5): 0-1004

Trace metals in soils may pose risks to both ecosystem and human health, especially in an urban environment. However, only a fraction of the metal content in soil is mobile and/or available for biota uptake and human ingestion. Various environmental availabilities of trace metals (Cu, Pb and Zn) in topsoil from highly urbanized areas of Hong Kong to plants, organisms, and humans, as well as the leaching potential to groundwater were evaluated in the present study. Forty selected soil samples were extracted with .11 M acid acetic, .1 M calcium chloride, .5 M diethylenetriaminepentaacetic acid, and simplified physiologically based extraction. Highlights: Four operationally defined fractions of trace metals in urban soils were investigated. The metals were generally in the order of Zn > Cu ? Pb for both mobility and effective bioavailability. Available metal concentrations were influenced by total contents and soil properties. Site specific data and environmental availabilities produce more realistic estimation for risk.


DOI: 10.1016/j.apgeochem.2011.07.001

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