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
Publicado
(Edición 1, 1972)
Esta publicación se revisó y confirmó por última vez en 2023.
Por lo tanto, esta versión es la actual.
Resumen
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.