Determination of free and total sulfur dioxide in wine samples by vapour-generation inductively coupled plasma-optical-emission spectrometry

Sulfur dioxide (SO₂) is used as a preservative and stabilizer in wine production to prevent undesired biochemical processes in the must and the final product. The concentration of SO₂ is restricted by national regulations. There are two main forms of SO₂ in wine--free (inorganic forms) and bound (fi...

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Bibliographic Details
Published in:Analytical and bioanalytical chemistry 2005-10, Vol.383 (3), p.483-488
Main Authors: Čmelík, Jiří, Machát, Jiří, Niedobová, Eva, Otruba, Vítězslav, Kanický, Viktor
Format: Article
Language:English
Subjects:
Calibration
ICP-OES
Sensitivity and Specificity
Spectrophotometry - instrumentation
Spectrophotometry - methods
sulfur dioxide
Sulfur Dioxide - analysis
Vapour generation
Volatilization
Wine - analysis
wines
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Summary:Sulfur dioxide (SO₂) is used as a preservative and stabilizer in wine production to prevent undesired biochemical processes in the must and the final product. The concentration of SO₂ is restricted by national regulations. There are two main forms of SO₂ in wine--free (inorganic forms) and bound (fixed to organic compounds, e.g. aldehydes). Iodometric titration is commonly employed for determination of SO₂ concentration (either by direct titration or after pre-separation by distillation); other techniques are also used. In this work inductively coupled plasma-optical-emission spectrometry with vapour generation was used for determination of free and total SO₂ in wine. Gaseous SO₂ is released from the sample by addition of acid and swept into the ICP by an argon stream. The intensity of the sulfur atomic emission lines is measured in the vacuum UV region. Determination of total SO₂ is performed after hydrolysis of bound forms with sodium hydroxide (NaOH). Concentrations of acid for vapour generation and NaOH for hydrolysis were optimised. The method was used for determination of free and total SO₂ in red and white wine samples and results were compared with those from iodometric titration.
ISSN:1618-2642
1618-2650
DOI:10.1007/s00216-005-3382-2