VFA(厌氧挥发酸)的测验方法及步调(国外英文资料).docVIP

VFA(厌氧挥发酸)的测验方法及步骤(国外英文资料) Three, measure method Determination of basic and total acidity. Accurate sample 2-3 g, distilled water, add 50 ml without CO2 in 200 ml flask, add 1 ml phosphate (purpose is to make combination patterns of volatile acid for free), in the steam generator heating distilling until 300 ml, use the distilled liquid alkali titration. Calculation: Volatile acid (in acetic acid) % = C times (V1? V2) * 0.06 times 100 The determination of volatile acid - titration -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- Release date: 2005-06-26 Chinese citrus spark technology network National standards of the Peoples Republic of China GB T15038-94. The determination of volatile acids of wine, fruit and wine 1 scope This method is suitable for the determination of volatile acid in wine, wine and related products. 2 the principle of Steam distillation way for the sample of low boiling point acids, volatile acid, and then using alkali standard solution titration after calculation and correction, volatile acid content in the sample are obtained. 3 reagent and solution 20% of the solution of tartaric acid; 3.2 sodium hydroxide standard solution (0.05 molar); 3.3 phenolphthalein indicator fluid 10g/L. Four instruments Distillation unit: any distillation unit that meets the following three requirements shall apply: The distilled water should not contain carbon dioxide. The recovery rate should be greater than or equal to 99.5%. The recovery should be less than or equal to 0.5 percent of the distillation of the sample by 20ml0.1 molar of lactic acid. 5 analysis steps Install the volatile acid distillation unit according to the instrument. Learn proper samples of 20 ℃ (V) and tartaric acid solution distillation in the device, collecting 100 ml distillate. Distillate is heated t