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dc.contributor.authorPla-Vilanova, Pepita
dc.contributor.authorGalceran i Nogués, Josep
dc.contributor.authorPuy Llorens, Jaume
dc.contributor.authorCompanys Ferran, Encarnació
dc.contributor.authorFilella, Montserrat
dc.date.accessioned2019-12-02T10:17:59Z
dc.date.available2021-07-29T22:08:08Z
dc.date.issued2019-09-29
dc.identifier.issn1572-6657
dc.identifier.urihttp://hdl.handle.net/10459.1/67636
dc.description.abstractDetermining antimony speciation is essential to understand its environmental behaviour and potential (eco)toxicological effects. Absence of Gradients and Nemstian Equilibrium Stripping (AGNES) is an electroanalytical technique that has been applied up to date to the determination of the free metal ion concentrations of Zn(II), Cd(II), Pb(II) and In(III). In this work, the first application of AGNES to the measurement of the concentration of one particular species of Sb(III) in aqueous solution is developed. The extensive hydrolysis of this element, even at low pH, suggests the convenience of performing calibrations and AGNES measurements in terms of the Sb(OH)(3(aq)) concentration, rather than the 'free' ion. A new preconcentration factor, Y', is also introduced as the ratio between [Sb degrees] in the amalgam and [Sb(OH)(3(aq))] in the solutionin dependence on pH is evaluated with calibrations at different pH values. The experimental values of Sb(OH)(3(aq)) obtained with AGNES in the titration of antimony with the organic ligand oxalate agree very well with the values predicted with the complexation constants recently reported. This promising methodology opens the way to tackle antimony speciation with AGNES in other systems.
dc.description.sponsorshipThe authors gratefully acknowledge support from the Spanish Ministerio de Economía y Competitividad (Project CTM2016-78798-C2-1-P). P. Pla-Vilanova thanks the Generalitat de Catalunya for a doctoral FI-AGAUR fellowship.
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherElsevier
dc.relationMINECO/PN2013-2016/CTM2016-78798-C2-1-P
dc.relation.isformatofVersió postprint del document publicat a: https://doi.org/10.1016/j.jelechem.2019.113334
dc.relation.ispartofJournal of Electroanalytical Chemistry, 2019, vol. 849, article number 113334
dc.rightscc-by-nc-nd (c) Elsevier, 2019
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es
dc.subjectAGNES
dc.subjectSb
dc.subjectSpeciation
dc.titleAntimony speciation in aqueous solution followed with AGNES
dc.typeinfo:eu-repo/semantics/article
dc.date.updated2019-12-02T10:18:01Z
dc.identifier.idgrec029228
dc.type.versioninfo:eu-repo/semantics/acceptedVersion
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.identifier.doihttps://doi.org/10.1016/j.jelechem.2019.113334


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cc-by-nc-nd (c) Elsevier, 2019
Except where otherwise noted, this item's license is described as cc-by-nc-nd (c) Elsevier, 2019