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Voltammetric Determination of the Total Acid Content in Ethanol-Water Mixtures. Application to Distilled Beverages

2001; Wiley; Volume: 13; Issue: 8-9 Linguagem: Inglês

10.1002/1521-4109(200105)13

1521-4109

M. Antonietta Baldo, Salvatore Daniele, Carlo Bragato, Gian Antonio Mazzocchin,

Advanced Chemical Sensor Technologies

ElectroanalysisVolume 13, Issue 8-9 p. 737-743 Article Voltammetric Determination of the Total Acid Content in Ethanol-Water Mixtures. Application to Distilled Beverages M. Antonietta Baldo, M. Antonietta Baldo sig@unive.it Department of Physical Chemistry, University of Venice, Calle Larga S. Marta 2137, 1-30123 Venice, ItalySearch for more papers by this authorSalvatore Daniele, Corresponding Author Salvatore Daniele Department of Physical Chemistry, University of Venice, Calle Larga S. Marta 2137, 1-30123 Venice, ItalyDepartment of Physical Chemistry, University of Venice, Calle Larga S. Marta 2137, 1-30123 Venice, ItalySearch for more papers by this authorCarlo Bragato, Carlo Bragato Department of Physical Chemistry, University of Venice, Calle Larga S. Marta 2137, 1-30123 Venice, ItalySearch for more papers by this authorGian A. Mazzocchin, Gian A. Mazzocchin Department of Physical Chemistry, University of Venice, Calle Larga S. Marta 2137, 1-30123 Venice, ItalySearch for more papers by this author M. Antonietta Baldo, M. Antonietta Baldo sig@unive.it Department of Physical Chemistry, University of Venice, Calle Larga S. Marta 2137, 1-30123 Venice, ItalySearch for more papers by this authorSalvatore Daniele, Corresponding Author Salvatore Daniele Department of Physical Chemistry, University of Venice, Calle Larga S. Marta 2137, 1-30123 Venice, ItalyDepartment of Physical Chemistry, University of Venice, Calle Larga S. Marta 2137, 1-30123 Venice, ItalySearch for more papers by this authorCarlo Bragato, Carlo Bragato Department of Physical Chemistry, University of Venice, Calle Larga S. Marta 2137, 1-30123 Venice, ItalySearch for more papers by this authorGian A. Mazzocchin, Gian A. Mazzocchin Department of Physical Chemistry, University of Venice, Calle Larga S. Marta 2137, 1-30123 Venice, ItalySearch for more papers by this author First published: 05 June 2001 https://doi.org/10.1002/1521-4109(200105)13:8/9 3.0.CO;2-7Citations: 6AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstract The voltammetric behavior for the reduction of acetic and perchloric acid was studied with a platinum microdisk electrode in synthetic ethanol-water mixtures with an ethanol content of 40 and 50 vol.%. The results demonstrated that the reduction of acetic acid proceeds through a fast chemical reaction preceding the electrode transfer involving hydrogen evolution, as in water solutions, the dissociation constant of the acetic acid being greater than about 1×10−6. This allowed us to derive an analytical expression relating the steady-state limiting current and analytical concentration of the weak acid. Depending on the concentration level, either standard addition procedures or an absolute equation proved valid to quantify the acid content of the synthetic mixtures. The detection limits evaluated in the synthetic 40 and 50 vol.% ethanol-water mixtures, provided 1.92×10−5 and 2.15×10−5 M, respectively. The voltammetric procedure was applied to the determination of the total acid content in distilled beverages such as whisky, rum, vodka and grappa, having an ethanol content ranging from 38 to 50 %. The results obtained with the proposed method were compared with the AOAC official method, which requires a dilution of the sample in water, and a good agreement was found. Comparative measurements carried out directly in the real samples by acid-base titrations using either phenolpthalein dye or potentiometry with a glass electrode for end-point detection, gave unreliable results. Citing Literature Volume13, Issue8-9May 2001Pages 737-743 RelatedInformation