The principle consists in a titration of a test portion with a standard volumetric sodium hydroxide solution, using phenolphthalein as indicator. ISO/R 731 has been subdivised into seven parts. ISO 731/2 replaces clause 3 of ISO Recommendation R 731-1968.
Status : WithdrawnPublication date : 1977-02
Edition : 1Number of pages : 2
A standard is reviewed every 5 years
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