In order to simplify the determination method of non-volatile acid content in GB/T 18187-2000,the sulfur dioxide residue tester-potentiometric titration method was used to determine the content of non-volatile acid in vinegar.The results show that the relative deviations of the methods are less than 1%,and the recoveries range from 93.10%to 96.30%.The method has high precision,simple operation and is suitable for batch distillation and determination.
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