期刊
ENVIRONMENTAL POLLUTION
卷 156, 期 3, 页码 605-610出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2008.06.023
关键词
Urban soils; Soil metals; Clay fraction; Metal bio-accessibility
资金
- Ministerio de Educacion y Ciencia of Spain [CTM2005-02256]
The availability of Cd, Cr, Cu, Ni, Mn, Pb and Zn present in the finest size particles of urban soils is studied by comparing the concentrations in the clay fraction with those extracted from the whole soil by either single-extraction or sequential extraction method. Many metals are preferentially present in the finest particles as compared to coarser fractions. This is true for most metals studied, except Mn and, perhaps, Cd. Those metals present in the clay fraction are often in easily bio-accessible forms, especially Cu, Pb and Zn. The results suggest that bio-accessible forms of these three metals are distributed among the three sequential fractions, and even the fraction considered as 'residual' is also bio-accessible to a significant extent. The statistical analysis shows some distinctions among metals that are compared to the 'urban', 'natural', or intermediate behaviour of the various metals as proposed earlier in the literature. (C) 2008 Elsevier Ltd. All rights reserved.
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