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Descripción
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| The incorporation of organic amendments to mine soils can improve its physical and chemical properties and affect the mobility and bioavailability of heavy metals. The aim of this work was to study the effect of soil pH and soluble organic matter content modified by the application of organic amendments on metal mobility. Two organic amendments (pine bark compost and a mixture of sheep and horse manure compost) were applied to metal contaminated soils collected from two mining areas near Madrid (Spain). Soil solutions were obtained using 0.005 M CaCl2 adjusted to different pHs. Extractable metal concentrations (Cu and Zn) and soluble organic carbon content were measured in the extracts. The NICA-Donnan model was used with the experimental data to predict metal speciation in soil solution and metal binding by soluble organic matter. Results showed that the application of organic amendments modified soil pH and increased the soluble organic matter content. Cu presents a high affinity to organic matter. The application of manure amendment reduced Cu desorption due to its higher pH and degree of humification. Conversely, pine bark amendment increased Cu mobility. A higher soluble organic carbon content promoted Cu desorption in soil because the formation of soluble complexes, especially at high pH. Most of extractable Cu was linked to organic species. On the other hand, extractable Zn was strongly affected by pH and this metal was mainly presented in soil solution as free cation. The addition of manure amendment reduced Zn mobility due to its high pH. | |
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Internacional
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Si |
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Nombre congreso
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4th International Congress of the European Soil Science Societies EUROSOIL |
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Tipo de participación
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960 |
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Lugar del congreso
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Bari (Italia) |
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Revisores
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Si |
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ISBN o ISSN
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99-9999-999-9 |
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DOI
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Fecha inicio congreso
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02/07/2012 |
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Fecha fin congreso
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06/07/2012 |
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Desde la página
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0 |
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Hasta la página
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0 |
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Título de las actas
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Libro de resúmenes del 4Th International Congress EUROSOIL 2012 |