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Advisor(s)
Abstract(s)
A flow injection manifold is proposed for the sequential
determination of titratable (total) acidity based on a
pseudotitration and of tartaric acid based on the
formation of a coloured vanadate complex. The method
involves in-line dialysis prior to injection to avoid
interference from the sample background absorption in
the spectrophotometric detection. The changes in the
colour of both reactions were monitored using two flow
cells aligned in the optical path of a single
spectrophotometer. Wine samples were analysed without
any sample pre-treatment; table wines in the range 1–10
g l21 (total acidity) and 0.5–4 g l21 (tartaric acid) and
port wines in the range 1–8 g l21 (total acidity) and 0.5–5
g l21 (tartaric acid). Sixteen samples can be measured per
hour, and the results were comparable to those obtained
by reference procedures for both determinations. RSDs
(n = 10) generally lower than 3% were obtained
Description
Keywords
Flow injection Total acidity Tartaric acid Wine
Citation
RANGEL, António O.S.S.; TÓTH, Ildikó V. - Sequential determination of titratable acidity and tartaric acid in wines by flow injection spectrophotometry. Analyst. ISSN 0003-2654. Vol. 123 (1998), p. 661–664
Publisher
Royal Society of Chemistry