A Combined Site-Specific Metals Sorption and Transport Model for Intact Soil Columns

A Combined Site-Specific Metals Sorption and Transport Model for Intact Soil Columns

11 páginas, 5 figuras y 6 tablas estadísticas

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Bibliographic Details
Main Authors: Serrano, Susana, Vlassopoulos, Dimitris, Garrido, Fernando, O’Day, Peggy A.
Format: artículo biblioteca
Language:English
Published: Soil Science Society of America 2013
Subjects:Sorpion metals, Soil columns,
Online Access:http://hdl.handle.net/10261/95069
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spelling dig-ica-es-10261-950692020-01-24T11:58:26Z A Combined Site-Specific Metals Sorption and Transport Model for Intact Soil Columns Serrano, Susana Vlassopoulos, Dimitris Garrido, Fernando O’Day, Peggy A. Sorpion metals Soil columns 11 páginas, 5 figuras y 6 tablas estadísticas Simulation of metal attenuation in natural soil environments requires model descriptions of combined sorption and transport processes that are generally transferable to assess potential risk. A non-electrostatic equilibrium ion exchange and surface complexation model (SCM), developed from batch experiments of Pb and Cd sorption to natural soils, was used to describe coupled transport in undisturbed soil column experiments. The model, based on soil mineral component additivity, was applied to reproduce metal transport without adjustment of sorption reactions or conditional equilibrium constants derived from batch experiments. Good agreement between model results and experimental soil column data for Pb and Cd uptake and release indicates that their transport at two different concentrations and flow rates can be described by sorption equilibria except for Pb at low concentration and slow flow rate. Model simulations were less successful in describing the transport behavior of Ca and Al, and effluent acidic pH, suggesting that additional reactions involving Al are needed. Fluctuations in effluent pH were not well simulated by the model, but model results were within ~0.25 to 0.5 log units of observed pH. Model results suggest that sorption competition between Pb, Cd, and Ca (from the background electrolyte) was mostly associated with ion exchange sites attributed to weathered illite at acidic pH, with additional adsorption of Pb on hydroxyl sites of extractable Fe-oxides. Simulations predicted net retention of Pb and Cd by soil columns from -9% to +13% of observed metal retention. This study demonstrates the ability to transfer a relatively small set of equilibrium sorption reactions and constants from batch to hydrodynamic column experiments under a limited set of flow conditions without arbitrary parameter fitting by using soil properties and mineralogy as constraints in model formulation. Ministerio de Economia y Competitividad (CGL2010-17434), US NIEHS Superfund Research Program (R01 ES016201) and the US National Science Foundation (CHE-1213407) Peer reviewed 2014-04-07T09:42:27Z 2014-04-07T09:42:27Z 2013 artículo http://purl.org/coar/resource_type/c_6501 Vadose Zone Journal 12(4). (2013) http://hdl.handle.net/10261/95069 10.2136/vzj2012.0152 en http://dx.doi.org/10.2136/vzj2012.0152 none Soil Science Society of America
institution ICA ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-ica-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICA España
language English
topic Sorpion metals
Soil columns
Sorpion metals
Soil columns
spellingShingle Sorpion metals
Soil columns
Sorpion metals
Soil columns
Serrano, Susana
Vlassopoulos, Dimitris
Garrido, Fernando
O’Day, Peggy A.
A Combined Site-Specific Metals Sorption and Transport Model for Intact Soil Columns
description 11 páginas, 5 figuras y 6 tablas estadísticas
format artículo
topic_facet Sorpion metals
Soil columns
author Serrano, Susana
Vlassopoulos, Dimitris
Garrido, Fernando
O’Day, Peggy A.
author_facet Serrano, Susana
Vlassopoulos, Dimitris
Garrido, Fernando
O’Day, Peggy A.
author_sort Serrano, Susana
title A Combined Site-Specific Metals Sorption and Transport Model for Intact Soil Columns
title_short A Combined Site-Specific Metals Sorption and Transport Model for Intact Soil Columns
title_full A Combined Site-Specific Metals Sorption and Transport Model for Intact Soil Columns
title_fullStr A Combined Site-Specific Metals Sorption and Transport Model for Intact Soil Columns
title_full_unstemmed A Combined Site-Specific Metals Sorption and Transport Model for Intact Soil Columns
title_sort combined site-specific metals sorption and transport model for intact soil columns
publisher Soil Science Society of America
publishDate 2013
url http://hdl.handle.net/10261/95069
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