Refractodensimetric method for determining the volume fraction of ethyl alcohol in wines and winy beverages

• Main Author: R. G. Timofeev
• Format: Article
• Language: Russian
• Published: Voronezh state university of engineering technologies 2020-10-01
• Series: Vestnik Voronežskogo Gosudarstvennogo Universiteta Inženernyh Tehnologij
• Subjects: winemaking, methods of analysis, alcoholometry, refractometry, densimetry
• Online Access: https://www.vestnik-vsuet.ru/vguit/article/view/2560
• ISSN: 2226-910X; 2310-1202

The tabular functional dependence of the ethyl alcohol content in liquid products of winemaking on the density and readings of refractometer sugar scale based on the processing of the measurement data of the refractive index and density of the model solutions and samples of wine products, as well as the paralleling determination of the volume fraction of ethyl alcohol by the method certified in winemaking according to GOST 32095-2013 was obtained. The established dependence was the basis for development of a non-destructive express method of determining the volume fraction of ethyl alcohol for wines and wine beverages prepared using products of winemaking, based on the changes in the density and index of refraction of liquid media. The use of bilinear interpolation methods made it possible to create a clear algorithm of actions for processing the measurement data, ensuring the sufficient relevance and unambiguity in determining the volume fraction of ethyl alcohol based on refractometry and densimetry data. Metrological certification of the method has been carried out. The method can be the basis for development of a regulatory document prescribing its use in the wine industry, as well as a technical task for realization of a portable device for determining the volume fraction of ethyl alcohol in liquid products of winemaking, based on the joint measurement of the indexes of refraction and density of the liquid.