Determination of the titratable acidity and the pH of wine based on potentiometric flow injection analysis

A FIA system using a pH-sensitive detector based on a graphite/quinhydrone/silicone composite electrode was applied to determine sequentially the titratable acidity and the pH of wine, as well as the sum of calcium and magnesium ions. For all measurements the same FIA configuration was used employin...

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Bibliographic Details
Published in:Talanta (Oxford) 2013-07, Vol.111, p.134-139
Main Authors: Vahl, Katja, Kahlert, Heike, von Mühlen, Lisandro, Albrecht, Anja, Meyer, Gabriele, Behnert, Jürgen
Format: Article
Language:English
Subjects:
calcium
Calcium - analysis
Calibration
Conductometry - instrumentation
Conductometry - methods
Electrodes
Flow injection analysis
Flow Injection Analysis - instrumentation
Flow Injection Analysis - methods
glass
graphene
Graphite
Graphite - chemistry
Hydrogen-Ion Concentration
Hydroquinones - chemistry
ions
Magnesium
Magnesium - analysis
measurement
Potentiometric pH detector
Potentiometry - instrumentation
Potentiometry - methods
Reproducibility of Results
silicone
Silicones
Silicones - chemistry
Standard deviation
Titratable acidity
Titration
Wine - analysis
Wines
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Summary:A FIA system using a pH-sensitive detector based on a graphite/quinhydrone/silicone composite electrode was applied to determine sequentially the titratable acidity and the pH of wine, as well as the sum of calcium and magnesium ions. For all measurements the same FIA configuration was used employing different carrier solutions. The results for the determination of acidity and pH are in good agreement with those obtained by classical potentiometric titrations and by pH measurements using a conventional glass electrode. The standard deviation was less than 1.5% for both kinds of measurements and the sample volume was 150μL. The method allows about 40 determinations of titratable acidity per hour and 30 pH measurements per hour. The titration method can be adjusted to the legal requirements in USA and Europe. [Display omitted] ► We developed a new FIA method to determine the acidity, pH, Ca2+ and Mg2+ in wine. ► One and the same instrumentation is used for all parameters. ► The results are in good agreement with classical batch measurements. ► The suggested method has a low standard deviation (less than 1.5%). ► The titration method can be adjusted to the legal requirements in USA and Europe.
ISSN:0039-9140
1873-3573
DOI:10.1016/j.talanta.2013.02.057