Determination of Total Sulphur Dioxide in Beer Samples by Flow‐Through Chronopotentiometry |
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Authors: | Josef Dvok Pavel Dostlek Karel trba Pavel ejka Vladimír Kellner Jií ulík Ernest Beinrohr |
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Affiliation: | Josef Dvo?ák,Pavel Dostálek,Karel ?těrba,Pavel ?ejka,Vladimír Kellner,Ji?í ?ulík,Ernest Beinrohr |
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Abstract: | A chronopotentiometric method for the determination of total sulphur dioxide in beer is described. Free and bound sulphites were converted to sulphite anions on alkalising the sample solutions. On acidifying the solution, the released sulphur dioxide was on‐line separated through a semipermeable membrane and transported by an electrolyte into the measuring cell and measured by stripping chronopotentiometry. The proposed method was validated and compared with the three EBC methods. The RSD of repeatability was 8.6% for the normal SO2 level in the beer (3.4 mg/L). The results corresponded well with those obtained with the alternative EBC methods. The elaborated method was much faster and simpler than the EBC methods. |
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Keywords: | Beer sulphur dioxide electrochemical analysis flow‐through stripping chronopotentiometry |
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