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Título

Availability and bio-accessibility of metals in the clay fraction of urban soils of Sevilla

AutorMadrid Díaz, Fernando ; Díaz Barrientos, Encarnación ; Madrid, Luis
Palabras claveUrban soils
Soil metals
Clay fraction
Metal bio-accessibility
Fecha de publicación14-jun-2008
EditorElsevier
CitaciónEnvironmental Pollution 156:605–610 (2008)
ResumenThe 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 he ‘urban’, ‘natural’, or intermediate behaviour of the various metals as proposed earlier in the literature.
Versión del editorhttp://www.sciencedirect.com/science/article/B6VB5-4T24FV5-5/2/27dc8cdfb7049fa028822dbd1cc88877
URIhttp://hdl.handle.net/10261/22282
DOI10.1016/j.envpol.2008.06.02
ISSN0269-7491 (Online)
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