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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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_09542299_v26_n4_p210_Gisele |
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todo:paper_09542299_v26_n4_p210_Gisele2023-10-03T15:51:42Z Time evolution of Pb(II) speciation in Pampa soil fractions Gisele, G.V. Montenegro, A.C. Tudino, M.B. Lavado, R.S. Molina, F.V. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 Gisele, G.V. Montenegro, A.C. Tudino, M.B. Lavado, R.S. Molina, F.V. 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. |
| format |
JOUR |
| author |
Gisele, G.V. Montenegro, A.C. Tudino, M.B. Lavado, R.S. Molina, F.V. |
| author_facet |
Gisele, G.V. Montenegro, A.C. Tudino, M.B. Lavado, R.S. Molina, F.V. |
| author_sort |
Gisele, G.V. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_09542299_v26_n4_p210_Gisele |
| work_keys_str_mv |
AT giselegv timeevolutionofpbiispeciationinpampasoilfractions AT montenegroac timeevolutionofpbiispeciationinpampasoilfractions AT tudinomb timeevolutionofpbiispeciationinpampasoilfractions AT lavadors timeevolutionofpbiispeciationinpampasoilfractions AT molinafv timeevolutionofpbiispeciationinpampasoilfractions |
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1807323184669655040 |