Abstract
An automated gas-liquid chromatographic method for the analysis of acetic acid in wines is described, which minimizes the often encountered difficulties of peak "tailing," broadening, and "ghosting". The method uses a 6' x 2 mm phosphoric acid-treated glass column, packed with 60/80 mesh Carbopack C, modified with 0.3% Carbowax 20M, and 0.1% H3PO4, which is extremely stable to aqueous injections. The accumulation of residues is eliminated by making a dilution of the sample, and using a glass insert in a low dead-volume injector port. Propionic acid is used as an internal standard, and helium carrier gas is saturated with formic acid to improve the chromatography. The method is rapid, accurate, and precise; giving a standard error of ± 0.0012 g acetic acid per 100 mL of wine, at the 0.005 to 0.054 g per 100-mL concentration level.
- Received June 1979.
- Revision received May 1980.
- Accepted June 1980.
- Published online January 1980
- Copyright 1980 by the American Society for Enology and Viticulture
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