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dc.contributor.authorJiménez-Piedrahita, Martín
dc.contributor.authorAltier Infantes, Alexandra
dc.contributor.authorCecilia Averós, Joan
dc.contributor.authorPuy Llorens, Jaume
dc.contributor.authorGalceran i Nogués, Josep
dc.contributor.authorRey Castro, Carlos
dc.contributor.authorZhang, Hao
dc.contributor.authorDavison, William
dc.date.accessioned2018-03-02T10:02:42Z
dc.date.available2018-05-16T22:45:20Z
dc.date.issued2017-06-20
dc.identifier.issn0003-2700
dc.identifier.urihttp://hdl.handle.net/10459.1/62728
dc.description.abstractDGT (Diffusion Gradients in Thin films) was designed to sample trace metals in situ at their natural concentrations. The setup and the experimental deployment conditions were established to allow interpretation of a linear accumulation of metal with time, using a simple expression based on a steady-state flux under perfect sink conditions. However, the extension of DGT to a wide range of analytes and its use under varied conditions has shown that, in some situations, these conditions are not fulfilled, so that accumulations with time are nonlinear. Previously, when such curvature was observed, concentrations in solution could not be reliably calculated. Here, we present fundamentally derived equations that reproduce the time accumulation for three situations: (i) kinetic limitations in the binding to the resin, (ii) saturation or equilibrium effects, or (iii) non-negligible competitive effects. We show how the accumulations can be quantified, in terms of the required kinetic and thermodynamic constants, and provide practical guidance for their use to obtain reliable estimates of solution concentrations. Solutions containing Mg or Mn, where all three situations can prevail, are used as examples. Calculated concentrations show reasonable agreement with the experimentally known values and with the results of a numerical model of the system, significantly improving, the estimations based on perfect sink conditions., Such an approach opens up the possibility of using DGT more widely in challenging systems and allows DGT data to be interpreted more fully.
dc.description.sponsorshipFinancial support from FEDER and the Spanish Ministry of Education and Science (Project Nos. CTM2012-39183, CTM2013-48967 and CTM2016-78798) is gratefully acknowl- edged
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherAmerican Chemical Society
dc.relationMICINN/PN2008-2011/CTM2012-39183
dc.relationMINECO/PN2013-2016/CTM2013-48967
dc.relationMINECO/PN2013-2016/CTM2016-78798
dc.relation.isformatofVersió postprint del document publicat a: https://doi.org/10.1021/acs.analchem.7b00704
dc.relation.ispartofAnalytical Chemistry, 2017, vol. 89, núm. 12, p. 6567-6574
dc.rights(c) American Chemical Society, 2017
dc.subject.otherFisicoquímica
dc.titleExtending the use of Diffusive Gradients in Thin Films (DGT) to solutions where competition, saturation, and kinetic effects are not negligible
dc.typeinfo:eu-repo/semantics/article
dc.date.updated2018-03-02T10:02:43Z
dc.identifier.idgrec025788
dc.type.versioninfo:eu-repo/semantics/acceptedVersion
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.identifier.doihttps://doi.org/10.1021/acs.analchem.7b00704


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