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Type: Artigo de periódico
Title: Conductimetric And Spectrophotometric Determination Of The Volatile Acidity Of Wines By Flow Injection
Author: Barros F.G.
Tubino M.
Abstract: Usual methods for the determination of the volatile acidity of wines are relatively slow, as about 40 min are necessary to perform one analysis. In this work, a method was developed which provides results in a much shorter time. About 60 analyses can be performed in 1 h. The conductimetric analysis consists of the injection of the wine sample into a de-ionized water stream which then flows past a poly(tetrafluoroethylene) membrane separator. The acetic acid diffuses through the membrane into another water stream that passes through a conductivity cell. The spectrophotometric method is similar. The acetic acid diffuses into a stream of Bromocresol Purple solution, at pH 7.0, which passes through a flow cell in a spectrophotometer set at 540 nm. For comparison, analyses were also carried out by the method of Jaulmes.
Citation: The Analyst. , v. 117, n. 5, p. 917 - 919, 1992.
Rights: aberto
Identifier DOI: 
Date Issue: 1992
Appears in Collections:Unicamp - Artigos e Outros Documentos

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