Assessment of trace metal binding kinetics in the resin phase of diffusive gradients in thin films

The dynamic technique of diffusive gradients in thin films (DGT), that measures metal speciation in situ, has found wide environmental application. Simple interpretation of the metal accumulation in terms of a solution concentration has assumed that trace metals do not penetrate beyond the surface o...

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Autores: Levy, Jacqueline L., Zhang, Hao, Davison, William, Puy Llorens, Jaume, Galceran i Nogués, Josep
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2012
País:España
Institución:Universitat de Lleida (UdL)
Repositorio:Repositori Obert UdL
OAI Identifier:oai:repositori.udl.cat:10459.1/48938
Acceso en línea:https://doi.org/10.1016/j.aca.2011.12.043
http://hdl.handle.net/10459.1/48938
Access Level:acceso abierto
Palabra clave:Pel·lícules fines
Cinètica química
Thin films
Chemical kinetics
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spelling Assessment of trace metal binding kinetics in the resin phase of diffusive gradients in thin filmsLevy, Jacqueline L.Zhang, HaoDavison, WilliamPuy Llorens, JaumeGalceran i Nogués, JosepPel·lícules finesCinètica químicaThin filmsChemical kineticsThe dynamic technique of diffusive gradients in thin films (DGT), that measures metal speciation in situ, has found wide environmental application. Simple interpretation of the metal accumulation in terms of a solution concentration has assumed that trace metals do not penetrate beyond the surface of the binding layer, but penetration, although theoretically discussed has not yet been directly measured. Multiple binding layers were used to enable analysis of different depths of a DGT binding phase (Chelex-100 or iminodiacetate resins). In simple metal solution (no ligand) at pH 7, metal penetration to the back layer was low and similar for all metals. However, at lower pH up to 42% of an individual metal accumulated in the back resin layer. This was most noticeable for Mn at pH 4 and 5, but Cd and Co were also affected at pH 4. These results were consistent with rate limited binding, particularly for Mn. A kinetic model successfully fitted the data and allowed derivation of a binding rate constant and the mean distance that metals penetrate into a resin gel (λM). Only for Mn, Co and Cd were experimentally derived λM values greater than the diameter of a Chelex-100 resin bead. For most situations, then, the penetration into the binding layer is negligible and binding of trace metal ions can be regarded as instantaneous, validating the simple use and interpretation of DGT. For weakly binding metals at low pH the slower binding allows penetration, which may affect the DGT measurement.Elsevier2012info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://doi.org/10.1016/j.aca.2011.12.043http://hdl.handle.net/10459.1/48938reponame:Repositori Obert UdL instname:Universitat de Lleida (UdL)InglésVersió postprint del document publicat a: https://doi.org/10.1016/j.aca.2011.12.043Analytica Chimica Acta, 2012, vol. 717, num. 2, p. 143-150(c) Elsevier, 2012info:eu-repo/semantics/openAccessoai:repositori.udl.cat:10459.1/489382026-06-24T12:42:17Z
dc.title.none.fl_str_mv Assessment of trace metal binding kinetics in the resin phase of diffusive gradients in thin films
title Assessment of trace metal binding kinetics in the resin phase of diffusive gradients in thin films
spellingShingle Assessment of trace metal binding kinetics in the resin phase of diffusive gradients in thin films
Levy, Jacqueline L.
Pel·lícules fines
Cinètica química
Thin films
Chemical kinetics
title_short Assessment of trace metal binding kinetics in the resin phase of diffusive gradients in thin films
title_full Assessment of trace metal binding kinetics in the resin phase of diffusive gradients in thin films
title_fullStr Assessment of trace metal binding kinetics in the resin phase of diffusive gradients in thin films
title_full_unstemmed Assessment of trace metal binding kinetics in the resin phase of diffusive gradients in thin films
title_sort Assessment of trace metal binding kinetics in the resin phase of diffusive gradients in thin films
dc.creator.none.fl_str_mv Levy, Jacqueline L.
Zhang, Hao
Davison, William
Puy Llorens, Jaume
Galceran i Nogués, Josep
author Levy, Jacqueline L.
author_facet Levy, Jacqueline L.
Zhang, Hao
Davison, William
Puy Llorens, Jaume
Galceran i Nogués, Josep
author_role author
author2 Zhang, Hao
Davison, William
Puy Llorens, Jaume
Galceran i Nogués, Josep
author2_role author
author
author
author
dc.subject.none.fl_str_mv Pel·lícules fines
Cinètica química
Thin films
Chemical kinetics
topic Pel·lícules fines
Cinètica química
Thin films
Chemical kinetics
description The dynamic technique of diffusive gradients in thin films (DGT), that measures metal speciation in situ, has found wide environmental application. Simple interpretation of the metal accumulation in terms of a solution concentration has assumed that trace metals do not penetrate beyond the surface of the binding layer, but penetration, although theoretically discussed has not yet been directly measured. Multiple binding layers were used to enable analysis of different depths of a DGT binding phase (Chelex-100 or iminodiacetate resins). In simple metal solution (no ligand) at pH 7, metal penetration to the back layer was low and similar for all metals. However, at lower pH up to 42% of an individual metal accumulated in the back resin layer. This was most noticeable for Mn at pH 4 and 5, but Cd and Co were also affected at pH 4. These results were consistent with rate limited binding, particularly for Mn. A kinetic model successfully fitted the data and allowed derivation of a binding rate constant and the mean distance that metals penetrate into a resin gel (λM). Only for Mn, Co and Cd were experimentally derived λM values greater than the diameter of a Chelex-100 resin bead. For most situations, then, the penetration into the binding layer is negligible and binding of trace metal ions can be regarded as instantaneous, validating the simple use and interpretation of DGT. For weakly binding metals at low pH the slower binding allows penetration, which may affect the DGT measurement.
publishDate 2012
dc.date.none.fl_str_mv 2012
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://doi.org/10.1016/j.aca.2011.12.043
http://hdl.handle.net/10459.1/48938
url https://doi.org/10.1016/j.aca.2011.12.043
http://hdl.handle.net/10459.1/48938
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.aca.2011.12.043
Analytica Chimica Acta, 2012, vol. 717, num. 2, p. 143-150
dc.rights.none.fl_str_mv (c) Elsevier, 2012
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Elsevier, 2012
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositori Obert UdL
instname:Universitat de Lleida (UdL)
instname_str Universitat de Lleida (UdL)
reponame_str Repositori Obert UdL
collection Repositori Obert UdL
repository.name.fl_str_mv
repository.mail.fl_str_mv
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