AGNES: a new electroanalytical technique for measuring free metal ion concentration

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dc.contributor.authorGalceran i Nogués, Josep
dc.contributor.authorCompanys Ferran, Encarnació
dc.contributor.authorPuy Llorens, Jaume
dc.contributor.authorCecilia Averós, Joan
dc.contributor.authorGarcés, Josep Lluís
dc.date.accessioned2015-11-04T08:08:54Z
dc.date.available2015-11-04T08:08:54Z
dc.date.issued2004
dc.date.updated2015-11-04T08:08:54Z
dc.description.abstractAGNES (absence of gradients and Nernstian equilibrium stripping) is a stripping technique consisting of two conceptual steps: (i) application of a potential program (e.g. a step at a fixed potential) generating a known concentration gain between the outer and inner concentrations of the metal at the mercury electrode surface together with null gradients of the concentration profiles (inside and outside the mercury electrode) and (ii) determination of the concentration of reduced metal inside the amalgam in a stripping step. In the present implementation, the stripping step under diffusion limited conditions leads to a measured current just proportional to the free metal ion concentration. In this paper we present the basic principles of the technique, analytical expressions for a simplified model of its voltammetric implementation and a numerical study for a more refined model together with preliminary experimental results in the Cd(II)/nitrilotriacetic acid system showing how this technique can be used as an alternative to other techniques (such as ion selective electrodes) in order to determine free metal activities or concentrations in the presence of complex mixtures avoiding complications such as electrodic adsorption or complexation kinetics.
dc.format.mimetypeapplication/pdf
dc.identifier.doihttps://doi.org/10.1016/j.jelechem.2003.11.017
dc.identifier.idgrec001996
dc.identifier.issn1572-6657
dc.identifier.urihttp://hdl.handle.net/10459.1/48902
dc.language.isoeng
dc.publisherElsevier
dc.relation.isformatofVersió postprint del document publicat a: https://doi.org/10.1016/j.jelechem.2003.11.017
dc.relation.ispartofJournal of Electroanalytical Chemistry, 2004, vol. 566, num. 1, p. 95-109
dc.rights(c) Elsevier, 2004
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.subject.classificationElectroquímica
dc.subject.classificationAnàlisi electroquímica
dc.subject.otherElectrochemistry
dc.subject.otherElectrochemical analysis
dc.titleAGNES: a new electroanalytical technique for measuring free metal ion concentration
dc.typeinfo:eu-repo/semantics/article
dc.type.versioninfo:eu-repo/semantics/acceptedVersion
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