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dc.contributor.authorCompanys Ferran, Encarnació
dc.contributor.authorGalceran i Nogués, Josep
dc.contributor.authorPuy Llorens, Jaume
dc.contributor.authorSedó, Maria
dc.contributor.authorVera, Ruben
dc.contributor.authorAnticó, Enriqueta
dc.contributor.authorFontàs, Claudia
dc.date.accessioned2018-12-03T11:30:34Z
dc.date.available2019-06-27T22:15:56Z
dc.date.issued2018-12
dc.identifier.issn0003-2670
dc.identifier.urihttp://hdl.handle.net/10459.1/65254
dc.description.abstractFour analytical techniques are compared: AGNES (Absence of Gradients and Nernstian Equilibrium Stripping), LASV (Anodic Stripping Voltammetry with Linear stripping), DGT (Diffusive Gradients in Thin films) and PIM (Polymer Inclusion Membranes). These techniques have been designed to provide the free ion concentration or a labile fraction, complementarily contributing to an integrated description of speciation and availability. Their simultaneous application to the determination of free Zn concentrations or labile fluxes in seven solutions of a hydroponic medium reveals characteristics of each technique and correlations between their results. All dynamic results can be interpreted in terms of a general theoretical framework on fluxes. Indeed, in techniques under diffusion-limited conditions in the sample, the flux can be split into the free contribution (linearly proportional to the free fraction), plus the contribution of the complexes (where mobility, lability and abundance of complexation are intertwined). A methodology to compute lability degrees is developed. Measurements with PIM devices confirm that diffusion in the sample solution is not rate limiting, so its flux is proportional to the free metal in the donor solution. A proportionality between the responses of any given two techniques is observed, which suggests that, for the low ligand-to-metal concentration ratios used in the present work, any of these techniques would correlate similarly with uptake, toxic or nutritional measurements.
dc.description.sponsorshipThis work was financially supported by the Spanish Ministry of Education and Science (projects CTM2013-48967 and CTM2016-78798). Alexandra Altier's help with DGT experiments is acknowledged.
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherElsevier
dc.relationMINECO/PN2013-2016/CTM2013-48967
dc.relationMINECO/PN2013-2016/CTM2016-78798
dc.relation.isformatofVersió postprint del document publicat a: https://doi.org/10.1016/j.aca.2018.06.071
dc.relation.ispartofAnalytica Chimica Acta, 2018, vol. 1035, p. 32-43
dc.rightscc-by-nc-nd, (c) Elsevier, 2018
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectDiffusive Gradients in Thin Films
dc.subjectAbsence of Gradients and Nernstian Equilibrium Stripping
dc.subjectPolymer Inclusion Membrane
dc.subjectVoltammetry
dc.titleComparison of different speciation techniques to measure Zn availability in hydroponic media
dc.typeinfo:eu-repo/semantics/article
dc.date.updated2018-12-03T11:30:35Z
dc.identifier.idgrec027661
dc.type.versioninfo:eu-repo/semantics/acceptedVersion
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.identifier.doihttps://doi.org/10.1016/j.aca.2018.06.071


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cc-by-nc-nd, (c) Elsevier, 2018
Except where otherwise noted, this item's license is described as cc-by-nc-nd, (c) Elsevier, 2018