Availability and bio-accessibility of metals in the clay fraction of urban soils of Sevilla
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 he ‘urban’, ‘natural’, or intermediate behaviour of the various metals as proposed earlier in the literature.
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Language: | English |
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Elsevier
2008-06-14
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Subjects: | Urban soils, Soil metals, Clay fraction, Metal bio-accessibility, |
Online Access: | http://hdl.handle.net/10261/22282 |
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dig-irnas-es-10261-222822011-04-07T22:00:00Z Availability and bio-accessibility of metals in the clay fraction of urban soils of Sevilla Madrid Díaz, Fernando Díaz Barrientos, Encarnación Madrid, Luis Ministerio de Educación y Ciencia (España) Urban soils Soil metals Clay fraction Metal bio-accessibility 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 he ‘urban’, ‘natural’, or intermediate behaviour of the various metals as proposed earlier in the literature. the financial help of the Ministerio de Educacio´n y Ciencia of Spain under project no. CTM2005-02256. Peer reviewed 2010-03-12T07:17:29Z 2010-03-12T07:17:29Z 2008-06-14 artículo http://purl.org/coar/resource_type/c_6501 Environmental Pollution 156:605–610 (2008) 0269-7491 (Online) http://hdl.handle.net/10261/22282 10.1016/j.envpol.2008.06.02 en http://www.sciencedirect.com/science/article/B6VB5-4T24FV5-5/2/27dc8cdfb7049fa028822dbd1cc88877 none 386605 bytes application/pdf Elsevier |
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Urban soils Soil metals Clay fraction Metal bio-accessibility Urban soils Soil metals Clay fraction Metal bio-accessibility |
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Urban soils Soil metals Clay fraction Metal bio-accessibility Urban soils Soil metals Clay fraction Metal bio-accessibility Madrid Díaz, Fernando Díaz Barrientos, Encarnación Madrid, Luis Availability and bio-accessibility of metals in the clay fraction of urban soils of Sevilla |
description |
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 he ‘urban’,
‘natural’, or intermediate behaviour of the various metals as proposed earlier in the literature. |
author2 |
Ministerio de Educación y Ciencia (España) |
author_facet |
Ministerio de Educación y Ciencia (España) Madrid Díaz, Fernando Díaz Barrientos, Encarnación Madrid, Luis |
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artículo |
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Urban soils Soil metals Clay fraction Metal bio-accessibility |
author |
Madrid Díaz, Fernando Díaz Barrientos, Encarnación Madrid, Luis |
author_sort |
Madrid Díaz, Fernando |
title |
Availability and bio-accessibility of metals in the clay fraction of urban soils of Sevilla |
title_short |
Availability and bio-accessibility of metals in the clay fraction of urban soils of Sevilla |
title_full |
Availability and bio-accessibility of metals in the clay fraction of urban soils of Sevilla |
title_fullStr |
Availability and bio-accessibility of metals in the clay fraction of urban soils of Sevilla |
title_full_unstemmed |
Availability and bio-accessibility of metals in the clay fraction of urban soils of Sevilla |
title_sort |
availability and bio-accessibility of metals in the clay fraction of urban soils of sevilla |
publisher |
Elsevier |
publishDate |
2008-06-14 |
url |
http://hdl.handle.net/10261/22282 |
work_keys_str_mv |
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