Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/1959

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dc.contributor.authorCanhoto, Carla-
dc.contributor.authorMatos, Mara-
dc.contributor.authorRodrigues, Astride-
dc.contributor.authorGeraldo, M. Dulce-
dc.contributor.authorBento, M. Fátima-
dc.date.accessioned2005-06-03T09:41:21Z-
dc.date.available2005-06-03T09:41:21Z-
dc.date.issued2004-08-
dc.identifier.citation"Journal of electroanalytical chemistry". 570:1 (2004) 63-67.eng
dc.identifier.issn0022-0728por
dc.identifier.urihttp://hdl.handle.net/1822/1959-
dc.description.abstractThe role of H+ on the steady-state voltammetric limiting current (IL) of weak acids (HA) reduction was studied considering results from either lactic acid or acetic acid solutions at constant pH. For solutions with pH > pKa or pH near pKa the [H+] effect on the IL vs cHA slope was important even when the H+ current contribution was minor. In opposition, when pH << pKa high H+ current contributions were found nevertheless the IL vs cHA slope was almost insensitive to pH. A general relationship between IL and cHA was derived considering both the H+ current contribution and the dissociation extent. This equation allows the analytical determination of weak acids, alone or in the presence of strong acids, from experimental IL and pH. Acids identification can also be performed through the presented expression, following the IL susceptibility to pH at constant cHA.eng
dc.description.sponsorshipPOCTI/QUI/ 39525/2001.por
dc.language.isoengeng
dc.publisherElseviereng
dc.rightsopenAccesseng
dc.subjectWeak acids analysiseng
dc.subjectMicroelectrodeseng
dc.subjectVoltammetryeng
dc.titleVoltammetric analysis of weak acids with microelectrodeseng
dc.typearticleeng
dc.peerreviewedyeseng
oaire.citationStartPage63por
oaire.citationEndPage67por
oaire.citationIssue1por
oaire.citationVolume570por
dc.identifier.doi10.1016/j.jelechem.2004.03.015por
dc.subject.wosScience & Technologypor
sdum.journalJournal of Electroanalytical Chemistrypor
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