自动电位滴定法测定三乙酸甘油酯的酸度

Determination of Acidity of Triacetin with Automatic Potentiometric Titration

为了克服常规酸碱滴定法测定三乙酸甘油酯酸度存在的诸如终点不易观察,相对标准偏差(RSD)较大等缺点,考察了自动电位滴定法。结果表明,自动电位滴定法的RSD为0.774%,定量限0.00175%,回收率99.5%～103.3%。该方法可以快速准确地测定三乙酸甘油酯的酸度。

In order to get rid of the disadvantages of conventional acid-base titration in determining the acidity of triacetin, such as inconvenience in endpoint differentiation and high relative standard deviation, automatic potentiometric titration was investigated. The results showed that the recoveries of the method ranged from 99.5% to 103.3% with the relative standard deviation of 0.774% and the limit of quantitation of 0.00175%. It proved that the acidity of triacetin could be rapidly and accurately determined with automatic potentiometric titration.