Conductimetric and spectrophotometric determination of the volatile acidity of wines by flow injection
نویسندگان
چکیده
منابع مشابه
Semiautomatic flow-injection method for determination of volatile acidity in wines.
A flow-injection (FI) method based on analytical pervaporation was assessed for its routine use in the determination of volatile acidity in winery laboratories. The new method was compared with both the official method and the Mathieu method, which is most often used in Spanish wineries, by testing 30 different wines, including young and aged, and sweet and dry wines from Montilla-Moriles appel...
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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 reacti...
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Flow injection analysis (FIA) methods for the spectrophotometric determination of CO2 and SO2 in wines are described. The determination of CO2 is based on the colour change of a low capacity buffer (containing an acid-base indicator) due to the dissolved carbon dioxide. The determination of SO2 is based on the decoloration of malachite green by sulphur dioxide. Two FIA manifolds are presented; ...
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Sulphide was determined spectrophotometrically at 628 nm and pH 6.7 based on its catalytic reduction of toluidine blue in the presence of Se(IV) using a flow injection system. After optimization of the measuring conditions the calibration curve was found linear up to 25 mg/mL and the detection limit was 0.3 mg/mL (30 mL injections). The ...
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A simple, rapid, and accurate spectrophotometric flow-injection method was developed for the determination of sorbic acid in wines based on the oxidation of sorbic acid with K2Cr2O7/H2SO4 at 1008C, followed by reaction of the resulting malonaldehyde with thiobarbituric acid, also at 1008C, to give a red product, the absorbance of which is measured at 532 nm. The method requires no prior distill...
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ژورنال
عنوان ژورنال: The Analyst
سال: 1992
ISSN: 0003-2654,1364-5528
DOI: 10.1039/an9921700917