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dc.contributor.authorJiménez-Piedrahita, Martín
dc.contributor.authorAltier Infantes, Alexandra
dc.contributor.authorCecilia Averós, Joan
dc.contributor.authorRey Castro, Carlos
dc.contributor.authorGalceran i Nogués, Josep
dc.contributor.authorPuy Llorens, Jaume
dc.date.accessioned2015-07-06T14:38:09Z
dc.date.available2015-07-06T14:38:09Z
dc.date.issued2015-05-02
dc.identifier.issn0003-2670
dc.identifier.urihttp://hdl.handle.net/10459.1/48405
dc.description.abstractBinding resin beads used in DGT (Diffusion Gradients in Thin films) tend to settle to one side of the resin during casting. This phenomenon might be relevant for metal accumulation when partially labile complexes dominate the metal speciation, especially after recognizing the important role played by complex dissociation in the resin domain. The influence of the inhomogeneity of the binding agent distribution on metal accumulation is here assessed by numerical simulation of DGT devices with binding beads in only one half of the resin disc, as a reasonable model of the standard resin discs. Results indicate that a decrease in mass accumulation of less than 13% can arise in these inhomogeneous devices (as compared with an ideal disc with homogeneous dispersion of the resin beads) when complexes with stability constant K<1E2m3 mol−1 (K<1E5 L mol−1) dominate the metal speciation. The loss increases as K increases, but the percentage of mass loss always remains lower than the volume fraction of resin disc without beads. For very labile or inert complexes, the impact of the inhomogeneous distribution of binding resin beads is negligible. As kinetic dissociation constants of complexes can be estimated from the distribution of the metal accumulation in a DGT device with a stack of two resin discs, the influence of the inhomogeneity on the recovered kinetic constant is also assessed. For the cases studied, the recovered kinetic dissociation constant, kd,recoveredkd,recovered, retains the correct order of magnitude, being related to the true kd by kd ≈ f −1 x kd(recovered), quite independently of K and kd values, being f the fraction of volume of the resin disc where resin beads are dispersed.
dc.description.sponsorshipFinancial support from the Spanish Ministry of Education and Science (Projects CTM2012-39183 and CTM2013-48967) is acknowledged. MJP acknowledges support from UdL and AA from MINECO BES-2013-065173.
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherElsevier
dc.relationMICINN/PN2008-2011/CTM2012-39183
dc.relationMINECO/PN2013-2016/CTM2013-48967-C2-1-P
dc.relationMINECO/PN2013-2016/BES-2013-065173
dc.relation.isformatofVersió preprint del document publicat a: https://doi.org/10.1016/j.aca.2015.04.054
dc.relation.ispartofAnalytica Chimica Acta, 2015, vol. 885, p. 148-155
dc.rights(c) Elsevier, 2015
dc.subject.classificationGomes i resines
dc.subject.classificationPel·lícules fines
dc.subject.otherGums and resins
dc.subject.otherThin films
dc.titleInfluence of the settling of the resin beads on diffusion gradients in thin films measurements
dc.typeinfo:eu-repo/semantics/article
dc.date.updated2015-07-06T14:38:10Z
dc.identifier.idgrec022595
dc.type.versioninfo:eu-repo/semantics/submittedVersion
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.identifier.doihttps://doi.org/10.1016/j.aca.2015.04.054


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