Analysis of Alcohol Content in Viscous Alcohol Gel Expressed as Percent by Volume
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This work to study method for analyzing alcohol content expressed as percentage by volume of alcohol, namely methanol, isopropanol and ethanol in a viscous alcohol gel that cannot be pipetted to exact volume. In this study, the true density of alcohol gel was measured to change from weight to gel volume. The researchers then measured the alcohol content with a headspace-gas chromatography flame ionization detector. Under the optimum conditions, the test took only 15 min for all three compounds. The results were calculated as a percentage by volume of each alcohol in the alcohol gel using the generated equation. There was a linear relationship between concentration and response. The range studied according to the criteria regulated by the Ministry of Public Health, methanol content does not exceed 5% by volume, while ethanol content should be more than 70% by volume. The analysis range of methanol and ethanol percentage by volume were 0.04 - 7.06 and 0.48 - 96.62 respectively, whereas isopropanol studied the small measurement range as same as methanol. This was because they are often found small quantities in real samples. The percentage recovery ranged from 95.05±3.89 to 97.71±5.18 for both methanol and isopropanol and 99.58±2.57 to 100.02±2.19 for ethanol. The precision of method was 3.19 - 5.36% for both methanol and isopropanol and 0.95 - 1.84% for ethanol.
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