The Analysis Committee has collaboratively tested local routine headspace gas chromatographic methods for the determination of the lower boiling point volatile compounds in beer. The repeatability values (r95) were dependent upon mean concentration (m) for acetaldehyde and alcohols but not for esters, ...
Taking the azeotrope of n-heptane and isopentyl alcohol as an example, the intermediate-boiling-point solvent of butyl acetate was determined as the entrainer. The experimental data of vapor-liquid equilibrium for the two systems of n-heptane isoamyl alcohol and n-heptane butyl acetate were ...