Abstract
The research has developed a method for simultaneous determination of acetaldehyde, ethyl acetate, methanol, isobutyl alcohol, isoamyl alcohol in white alcohol. Validation results show that the method has satisfactory accuracy with recovery in the range of 105 - 108%, repeatability RSD < 1.57%, detection limit below 3 mg/L for all compounds. Proficiency test results in 2020 were satisfactory with Z-scores of all substances below 2. The method has been applied to analyze 200 distilled alcohol samples and 50 blended alcohol samples taken in Hai Duong city during the period from 2018 to 2020. Three of 200 distilled alcohol samples have the methanol content higher than the maximum limit. The relationship between methanol content in proportion to content of acetaldehyde, ethyl acetate, isobutyl alcohol, and isoamyl alcohol in the same sample has been evaluated to distinguish between blended alcohol and distilled alcohol.
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