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CO 2 Correction Factor for the Net Contents of Containers
Author(s) -
Josep Maria Ustrell i Torrent
Publication year - 2006
Publication title -
journal of the institute of brewing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.523
H-Index - 51
eISSN - 2050-0416
pISSN - 0046-9750
DOI - 10.1002/j.2050-0416.2006.tb00743.x
Subject(s) - brewing , operations research , citation , molality , mathematics , library science , information retrieval , chemistry , computer science , food science , fermentation , aqueous solution
SUMMARY A new formula to replace the current EBC formula for the correction of net contents in beer containers for the presence of CO 2 has been derived from a bibliographic study that reviews the influence of carbonation on beer density determinations. The study reviews the relationship between beer density and CO 2 partial molal volume (PMV) as defined by the American Society of Brewing Chemists (ASBC) (ASBC Methods of Analysis Fills‐1 formula) and that given by the European Brewery Convention Analysis Committee (EBC) and shows that in the current EBC equation a CO 2 PMV of 0.65 mL/g and a residual CO 2 content after degassing of 0 v/v or % (m/m) is used. Experimental determination of CO 2 PMV gives values of 0.73 ± 0.01 mL/g for most of the standard European beers as Lager, Pilsener, Premium and Export styles. Residual CO 2 levels after decarbonation were quantified for a series of degassing methods and were found to be between 0.20 to 0.50 v/v average 0.40 v/v or 0.08% (m/m). A new equation for determining the CO 2 correction was then proposed assuming a PMV of 0.73 mL/g and a beer carbonation level of 0.40 v/v or 0.08% (m/m) after normal degassing. The new formula is recommended for inclusion in Analytica‐EBC replacing the current formula.