Competition effects in cation binding to humic acid: Conditional affinity spectra for fixed total metal concentration conditions

Information on the Pb and Cd binding to a purified Aldrich Humic Acid (HA) is obtained from the influence of different fixed total metal concentrations on the acid- base titrations of this ligand. NICA (Non-Ideal Competitive Adsorption) isotherm has been used for a global quantitative description of...

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Autores: David, Calin, Mongin, Sadrine, Rey-Castro, Carlos, Galceran, Josep, Companys, Encarnació, Garcés, Josep Lluís, Salvador, José, Puy, Jaume, Cecilia, Joan, Lodeiro, Pablo, Mas i Pujadas, Francesc
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2010
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/108896
Acceso en línea:https://hdl.handle.net/2445/108896
Access Level:acceso abierto
Palabra clave:Macromolècules
Polielectròlits
Àcid húmic
Equilibri àcid-base
Macromolecules
Polyelectrolytes
Humic acid
Acid-base equilibrium
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spelling Competition effects in cation binding to humic acid: Conditional affinity spectra for fixed total metal concentration conditionsDavid, CalinMongin, SadrineRey-Castro, CarlosGalceran, JosepCompanys, EncarnacióGarcés, Josep LluísSalvador, JoséPuy, JaumeCecilia, JoanLodeiro, PabloMas i Pujadas, FrancescMacromolèculesPolielectròlitsÀcid húmicEquilibri àcid-baseMacromoleculesPolyelectrolytesHumic acidAcid-base equilibriumInformation on the Pb and Cd binding to a purified Aldrich Humic Acid (HA) is obtained from the influence of different fixed total metal concentrations on the acid- base titrations of this ligand. NICA (Non-Ideal Competitive Adsorption) isotherm has been used for a global quantitative description of the binding, which has then been interpreted by plotting the Conditional Affinity Spectra of the H+ binding at fixed total metal concentrations (CAScTM). This new physicochemical tool, here introduced, allows the interpretation of binding results in terms of distributions of proton binding energies. A large increase in the acidity of the phenolic sites as the total metal concentration increases, especially in presence of Pb, is revealed from the shift of the CAScTM towards lower affinities. The variance of the CAScTM distribution, which can be used as a direct measure of the heterogeneity, also shows a significant dependence on the total metal concentration. A discussion of the factors that influence the heterogeneity of the HA under the conditions of each experiment is provided, so that the smoothed pattern exhibited by the titration curves can be justified.Elsevier Ltd2017201720102017info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersion12 p.application/pdfhttps://hdl.handle.net/2445/108896Articles publicats en revistes (Ciència dels Materials i Química Física)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésVersió postprint del document publicat a: https://doi.org/10.1016/j.gca.2010.06.023Geochimica et Cosmochimica Acta, 2010, vol. 74, num. 18, p. 5216-5227https://doi.org/10.1016/j.gca.2010.06.023(c) Elsevier Ltd, 2010info:eu-repo/semantics/openAccessoai:recercat.cat:2445/1088962026-05-29T05:05:01Z
dc.title.none.fl_str_mv Competition effects in cation binding to humic acid: Conditional affinity spectra for fixed total metal concentration conditions
title Competition effects in cation binding to humic acid: Conditional affinity spectra for fixed total metal concentration conditions
spellingShingle Competition effects in cation binding to humic acid: Conditional affinity spectra for fixed total metal concentration conditions
David, Calin
Macromolècules
Polielectròlits
Àcid húmic
Equilibri àcid-base
Macromolecules
Polyelectrolytes
Humic acid
Acid-base equilibrium
title_short Competition effects in cation binding to humic acid: Conditional affinity spectra for fixed total metal concentration conditions
title_full Competition effects in cation binding to humic acid: Conditional affinity spectra for fixed total metal concentration conditions
title_fullStr Competition effects in cation binding to humic acid: Conditional affinity spectra for fixed total metal concentration conditions
title_full_unstemmed Competition effects in cation binding to humic acid: Conditional affinity spectra for fixed total metal concentration conditions
title_sort Competition effects in cation binding to humic acid: Conditional affinity spectra for fixed total metal concentration conditions
dc.creator.none.fl_str_mv David, Calin
Mongin, Sadrine
Rey-Castro, Carlos
Galceran, Josep
Companys, Encarnació
Garcés, Josep Lluís
Salvador, José
Puy, Jaume
Cecilia, Joan
Lodeiro, Pablo
Mas i Pujadas, Francesc
author David, Calin
author_facet David, Calin
Mongin, Sadrine
Rey-Castro, Carlos
Galceran, Josep
Companys, Encarnació
Garcés, Josep Lluís
Salvador, José
Puy, Jaume
Cecilia, Joan
Lodeiro, Pablo
Mas i Pujadas, Francesc
author_role author
author2 Mongin, Sadrine
Rey-Castro, Carlos
Galceran, Josep
Companys, Encarnació
Garcés, Josep Lluís
Salvador, José
Puy, Jaume
Cecilia, Joan
Lodeiro, Pablo
Mas i Pujadas, Francesc
author2_role author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Macromolècules
Polielectròlits
Àcid húmic
Equilibri àcid-base
Macromolecules
Polyelectrolytes
Humic acid
Acid-base equilibrium
topic Macromolècules
Polielectròlits
Àcid húmic
Equilibri àcid-base
Macromolecules
Polyelectrolytes
Humic acid
Acid-base equilibrium
description Information on the Pb and Cd binding to a purified Aldrich Humic Acid (HA) is obtained from the influence of different fixed total metal concentrations on the acid- base titrations of this ligand. NICA (Non-Ideal Competitive Adsorption) isotherm has been used for a global quantitative description of the binding, which has then been interpreted by plotting the Conditional Affinity Spectra of the H+ binding at fixed total metal concentrations (CAScTM). This new physicochemical tool, here introduced, allows the interpretation of binding results in terms of distributions of proton binding energies. A large increase in the acidity of the phenolic sites as the total metal concentration increases, especially in presence of Pb, is revealed from the shift of the CAScTM towards lower affinities. The variance of the CAScTM distribution, which can be used as a direct measure of the heterogeneity, also shows a significant dependence on the total metal concentration. A discussion of the factors that influence the heterogeneity of the HA under the conditions of each experiment is provided, so that the smoothed pattern exhibited by the titration curves can be justified.
publishDate 2010
dc.date.none.fl_str_mv 2010
2017
2017
2017
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/108896
url https://hdl.handle.net/2445/108896
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1016/j.gca.2010.06.023
Geochimica et Cosmochimica Acta, 2010, vol. 74, num. 18, p. 5216-5227
https://doi.org/10.1016/j.gca.2010.06.023
dc.rights.none.fl_str_mv (c) Elsevier Ltd, 2010
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Elsevier Ltd, 2010
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 12 p.
application/pdf
dc.publisher.none.fl_str_mv Elsevier Ltd
publisher.none.fl_str_mv Elsevier Ltd
dc.source.none.fl_str_mv Articles publicats en revistes (Ciència dels Materials i Química Física)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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