Kvasny Prum. 1987; 33(7): 199-202 | DOI: 10.18832/kp1987040

A comparison of the methods of derermining SO2 in red wines.Peer-reviewed article

M. DRDÁK, A. DOBOŠ, F. MALÍK, J. KAROVIČOVÁ, E. PAVLECHOVÁ

There is comparison of the methods of determining free SO₂ from measured absorbance after decolorization of anthocyanins, potentiometric determination of free and whole SO₂ and determination of whole SO₂ by the distillation method. It has been shown that the distillation Metod may be a correct and precise one. In terms of the results of this method there was calculated the correlation with the values of potentiometric determination for Svätovavrinecké wine r = 0,995 and for Frankovka r = 0,981. The correlation coefficient r = 0,992 and an equation of straight line in form x̅_B = 7,05 + 1,05 x̅_A, was found out for 43 samples of different  brands of red wine, e. g. the results are affected by continuous and proportional errors. The results of determining free SO2 by potentiometric titration and by spectrophotometric method (decolorizartion and anthocyanins) have no relation.
(In Slovak, English summary only)

Keywords: red wine, SO2, determination, potentiometric titration

Published: July 1, 1987