Time evolution of Pb(II) speciation in Pampa soil fractions

Soil pollution by heavy metals, particularly lead, is an important environmental concern; the bioavailability of such pollutants is strongly dependent on their chemical form. Here, the speciation of Pb(II) in soil fractions as a function of time shortly after its incorporation is studied, using a se...

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Autores principales: Montenegro, Andrea Constanza, Tudino, Mabel Beatriz, Molina, Fernando Victor
Publicado: 2014
Materias:
Bioavailability of pollutants
Heavy metals
Sequential selective extraction
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09542299_v26_n4_p210_Gisele
http://hdl.handle.net/20.500.12110/paper_09542299_v26_n4_p210_Gisele
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_09542299_v26_n4_p210_Gisele2023-06-08T15:55:49Z Time evolution of Pb(II) speciation in Pampa soil fractions Montenegro, Andrea Constanza Tudino, Mabel Beatriz Molina, Fernando Victor Bioavailability of pollutants Heavy metals Sequential selective extraction Soil pollution by heavy metals, particularly lead, is an important environmental concern; the bioavailability of such pollutants is strongly dependent on their chemical form. Here, the speciation of Pb(II) in soil fractions as a function of time shortly after its incorporation is studied, using a selective sequential extraction method. The sample came from an Argentinean Pampas region and was extensively characterised, including Rietveld analysis of the silt+clay fraction XRD pattern to find the major mineral components. Experiments were run twice, once in the winter and once in the summer. The results show different speciation time profiles in both cases, showing faster changes in winter due to the higher water content. The summer experiment corresponds to an earlier stage in the speciation profile evolution compared with winter. The soluble/exchangeable fraction decreases with time in summer but shows a lower and constant value in the winter. A high proportion is found to be adsorbed onto the stable (aluminosilicates+quartz) mineral fraction. The results strongly suggest that, even at a short time following soil pollution with Pb, a high proportion is adsorbed onto the mineral fraction, with only a low fraction being bioavailable. The most stable (mineral incorporated) form is observed to increase with time. Soil water content appears to be more important than temperature in determining the differences between the two. Fil:Montenegro, A.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tudino, M.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Molina, F.V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09542299_v26_n4_p210_Gisele http://hdl.handle.net/20.500.12110/paper_09542299_v26_n4_p210_Gisele
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Bioavailability of pollutants
Heavy metals
Sequential selective extraction
spellingShingle Bioavailability of pollutants
Heavy metals
Sequential selective extraction
Montenegro, Andrea Constanza
Tudino, Mabel Beatriz
Molina, Fernando Victor
Time evolution of Pb(II) speciation in Pampa soil fractions
topic_facet Bioavailability of pollutants
Heavy metals
Sequential selective extraction
description Soil pollution by heavy metals, particularly lead, is an important environmental concern; the bioavailability of such pollutants is strongly dependent on their chemical form. Here, the speciation of Pb(II) in soil fractions as a function of time shortly after its incorporation is studied, using a selective sequential extraction method. The sample came from an Argentinean Pampas region and was extensively characterised, including Rietveld analysis of the silt+clay fraction XRD pattern to find the major mineral components. Experiments were run twice, once in the winter and once in the summer. The results show different speciation time profiles in both cases, showing faster changes in winter due to the higher water content. The summer experiment corresponds to an earlier stage in the speciation profile evolution compared with winter. The soluble/exchangeable fraction decreases with time in summer but shows a lower and constant value in the winter. A high proportion is found to be adsorbed onto the stable (aluminosilicates+quartz) mineral fraction. The results strongly suggest that, even at a short time following soil pollution with Pb, a high proportion is adsorbed onto the mineral fraction, with only a low fraction being bioavailable. The most stable (mineral incorporated) form is observed to increase with time. Soil water content appears to be more important than temperature in determining the differences between the two.
author Montenegro, Andrea Constanza
Tudino, Mabel Beatriz
Molina, Fernando Victor
author_facet Montenegro, Andrea Constanza
Tudino, Mabel Beatriz
Molina, Fernando Victor
author_sort Montenegro, Andrea Constanza
title Time evolution of Pb(II) speciation in Pampa soil fractions
title_short Time evolution of Pb(II) speciation in Pampa soil fractions
title_full Time evolution of Pb(II) speciation in Pampa soil fractions
title_fullStr Time evolution of Pb(II) speciation in Pampa soil fractions
title_full_unstemmed Time evolution of Pb(II) speciation in Pampa soil fractions
title_sort time evolution of pb(ii) speciation in pampa soil fractions
publishDate 2014
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09542299_v26_n4_p210_Gisele
http://hdl.handle.net/20.500.12110/paper_09542299_v26_n4_p210_Gisele
work_keys_str_mv AT montenegroandreaconstanza timeevolutionofpbiispeciationinpampasoilfractions
AT tudinomabelbeatriz timeevolutionofpbiispeciationinpampasoilfractions
AT molinafernandovictor timeevolutionofpbiispeciationinpampasoilfractions
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