11 Alcohol (alcohol content) testing

This standard specifies the method for determining the alcohol content in alcohol, Yanrun liquor, fermented liquor, and prepared liquor. This standard is applicable to the determination of alcohol content in alcohol, Yanrun liquor, fermented liquor, and prepared liquor. Among them, the first method is applicable to distilled spirits, fermented spirits, and blended spirits. The second method is applicable to alcohol and distilled spirits, fermented spirits, and blended spirits (excluding beer). The third method is gas chromatography, which is applicable to wine, fruit wine, and beer. The fourth method is digital densitometer, which is applicable to beer, brandy, whiskey, and vodka. The first method is the density bottle method, which uses distillation to remove non volatile substances from the sample. The density bottle method is used to measure the density of the sample (alcohol aqueous solution) at 20C. Refer to Appendix A to obtain the volume fraction of ethanol content at 20C, which is the alcohol content. 3 Instruments and equipment 3.1 Analytical balance: sensitivity 0.000 1 go. 3.2 All glass still: 500mL. 3.3 Constant temperature water bath; Temperature control accuracy 0.1 C.3.4 Attached thermometer density bottle: 25 ml. or 50 mL. 4 Analysis step 4.1 Sample preparation 4.1.1 Distilled liquor, fermented liquor, and mixed liquor sample preparation (excluding beer and sparkling wine) Use a clean and dry 100 mL volumetric flask to accurately measure 100 ml of the sample (liquid temperature 20 C). In a 500 mL Yan distillation flask, rinse the volumetric flask three times with 50ml of water. Add the washing solution to a 500mL distillation flask, add a few zeolites (or glass beads), and connect the serpentine condenser tube, Use the original volumetric flask used for sampling as the receiver (with an additional ice bath). Turn on the cooling water (the temperature of the cooling water should be lower than 15 C), slowly heat and distill, and collect the distillate. When approaching the mark, remove the volumetric flask and cap, keep it warm in a 20 ° C water bath for 30 minutes, then add water to the mark, and mix well. Spare

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