Abstract
Flow through coulometry is used for analysis of wine samples for the determination of some heavy metals, sulphites, acidity and ethanol content. Low concentrations of heavy metals and sulphite contents are determined by making use of stripping chronopotentiometry. For the measurement of acid and ethanol content thin-layer coulometric titration is used.
Highlights
Wine is a traditional beverage consumed all over the world
Electrochemical flow-through cells specially designed for automatic and virtually maintenance-free operation facilitate the measurement of various species in wine samples: heavy metals (Cd, Pb, Hg), semimetals (As, Se), anions, organics
The measurement of heavy metals is based on the deposition/stripping procedure, where the metal ions are electrochemically deposited on the electrode surface and are stripped by constant current whereas the duration of the stripping is measured
Summary
Wine is a traditional beverage consumed all over the world. Its quality depends on the sensoric characteristics and on the presence, or better absence of undesirable, mostly allergic or even toxic substances, such as heavy metals, high sulphite contents. Electrochemical flow-through cells specially designed for automatic and virtually maintenance-free operation facilitate the measurement of various species in wine samples: heavy metals (Cd, Pb, Hg), semimetals (As, Se), anions (sulphite, chloride), organics (ethanol, ascorbic acid, tartric acid). The measurement of heavy metals is based on the deposition/stripping procedure, where the metal ions are electrochemically deposited on the electrode surface and are stripped by constant current whereas the duration of the stripping is measured. This mode enables the measurement of low metal concentrations, down to the μg/l contents. To hydrogen in an encapsulated gold or platinum electrode, whereas ethanol is measured through its electrochemical oxidation to acetaldehyde on a platinum electrode coated with a catalytic surface
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