Reference number
ISO 2227:1972
ISO 2227:1972
© ISO 2024
International Standard
ISO 2227:1972
Formaldehyde solutions for industrial use — Determination of formaldehyde content
Edition 1
1972-12
1972-12
ISO 2227:1972
7032
Published
(Edition 1, 1972)
This publication was last reviewed and confirmed in 2023.
Therefore this version remains current.
Abstract
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.