English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/95069
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

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

AutorSerrano, Susana; Vlassopoulos, Dimitri; Garrido, Fernando ; O’Day, Peggy A.
Palabras claveSorpion metals
Soil columns
Fecha de publicación2013
EditorSoil Science Society of America
CitaciónVadose Zone Journal 12(4). (2013)
ResumenSimulation 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.
Descripción11 páginas, 5 figuras y 6 tablas estadísticas
Versión del editorhttp://dx.doi.org/10.2136/vzj2012.0152
Aparece en las colecciones: (ICA) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
restringido.pdf21,67 kBAdobe PDFVista previa
Mostrar el registro completo

Artículos relacionados:

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.