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Status : Withdrawn
Standard Type : Main
Document No :
Document Year : 1978
Pages : 6
Edition : 1
Section Volume : Fruit and vegetable products (ISO/TC 34/SC 3.)
The method consists in homogenizing the product, followed by quantitative entraining, by steam, of the acid present in a test portion, determination of the acid in the destillate obtained, either by spectrophotometry in the ultra-violet range (technique A) or by measuring by photocolorimetry or by spectrophotometry the pink colour obtained after oxidation by chromic acid and then treatment with thiobarbituric acid (technique B).