Материал портала elab
статья/документ по запросу ресурса "828"
2026-01-29 Ключевые слова: alcohol, china's standard, ethanol reference A method for the quantitative determination of volatile compounds in alcoholic beverages from grapes or other plant materials using ethanol as an internal standard ("IS_Ethanol") was proposed. This method allows for increased efficiency of National standards in China, particularly. Its essence lies in the use of ethanol contained in the sample as an internal standard in order to improve the accuracy of measurements and eliminate the need for adding an internal standard. The advantages of this method (modified internal standard method, hereinafter referred to as "IS_Ethanol") include, in particular, the elimination of the need to measure the density and strength of the analyzed sample: the concentration of volatile impurities is calculated based on measurements directly in units of g/100 L of anhydrous alcohol (g/100 L AA) or mg/L of anhydrous alcohol (mg/L AA). This method is suitable for the determination of a number of volatile substances such as acetaldehyde (ethanal), methyl acetate, ethyl acetate, 1,1-diethoxyethane (acetal), methanol, butan-2-ol, propan-2-ol, propan-1-ol (n-propanol), isobutanol (2-methylpropan-1-ol), butan-1-ol (n-butanol), active amyl alcohol (2-methylbutan-1-ol), isoamylol (3-methylbutan-1-ol) with an analyte content of 0.2-1500 g/100L AA or 2-15000 mg/L AA in alcoholic and other alcohol-containing products by gas chromatography. The new "IS_Ethanol" method has the following advantages: 1. There is no need to purchase individual chemicals used as IS; 2. There is no need for a manual procedure for adding IS to the samples; 3. The reliability of the data obtained is increased.
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