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Norm
ISO 2227:1972
Issue date: 1972 12 01
Formaldehyde solutions for industrial use — Determination of formaldehyde content
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. Th...
Valid
Publisher:
International Organization for Standardization
Format:
Digital | 2 Pages
Language:
English
ICS
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.
