Interpretation of diffusion gradients in thin films (DGT) measurements: a systematic approach

dc.contributor.authorGalceran i Nogués, Josep
dc.contributor.authorPuy Llorens, Jaume
dc.date.accessioned2018-10-31T10:46:19Z
dc.date.available2018-10-31T10:46:19Z
dc.date.issued2015
dc.date.updated2018-10-31T10:46:20Z
dc.description.abstractGaining insight into the physicochemical processes integrated in a DGT (diffusion gradients in thin films) measurement and combining them in a model can assist in retrieving fundamental information, both qualitative and quantitative, on the probed system. New experiments (such as varying the thicknesses of the gel or the resin layer) and their mathematical treatment to extract meaningful parameters have been suggested from theoretical considerations. The concept of lability degree is useful in describing an interpretation of the DGT concentration as the summation of the free metal concentration plus the labile fraction of all complexes multiplied by a ratio of diffusion coefficients. In some cases, the lability degree can be directly estimated with specific measurements and a very simple expression. We review the current status of these interpretations, including numerical simulations, with special focus on analytical expressions, because they can be more accessible to the standard DGTpractitioner. Present limitations and challenges for future work in DGT interpretation are also discussed.
dc.description.sponsorshipWe thank all our co-workers along these years with DGT and especially to professor William Davison for his inspiration, creativity, kindness and leadership. This study was financially supported by the Spanish Ministry of Education and Science (Project 535 CTM2012-39183) and by the “Comissionat per a Universitats i Recerca del Departament d’Innovació, Universitats i Empresa de la Generalitat de Catalunya”.
dc.format.mimetypeapplication/pdf
dc.identifier.doihttps://doi.org/10.1071/EN14068
dc.identifier.idgrec021833
dc.identifier.issn1448-2517
dc.identifier.urihttp://hdl.handle.net/10459.1/65017
dc.language.isoeng
dc.publisherCSIRO Publishing
dc.relationinfo:eu-repo/grantAgreement/MINECO//CTM2012-39183-C02-02/ES/FISICOQUIMICA DE LAS INTERACCIONES Y FENOMENOS DE TRANSPORTE A NIVEL COLOIDAL ENTRE IONES, MACROMOLECULAS Y NANOPARTICULAS DE INTERES AMBIENTAL/
dc.relation.isformatofVersió postprint del document publicat a: https://doi.org/10.1071/EN14068
dc.relation.ispartofEnvironmental Chemistry, 2015, vol. 12, núm. 2, p. 112-122
dc.rights(c) CSIRO, 2015
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.titleInterpretation of diffusion gradients in thin films (DGT) measurements: a systematic approach
dc.typeinfo:eu-repo/semantics/article
dc.type.versioninfo:eu-repo/semantics/acceptedVersion
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