The specified method is applicable to HCHO contents between 25 5 and 45 %. The field of application may be extended by siutably modifying the mass of the test portion. The principle consists in the reaction of the test solution with a neutral sodium sulphite solution, and acidimetric titration of the liberated sodium hydroxide in presence of thymolphthalein as indicator.
Status: PublishedPublication date: 1972-12
Edition: 1Number of pages: 2
Technical Committee: ISO/TC 47 Chemistry
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