Reference number
ISO 1391-5:1981
ISO 1391-5:1981
© ISO 2024
ISO 1391-5:1981
Paraformaldehyde for industrial use — Methods of test — Determination of aldehyde content — Titrimetric method
Edition 1
1981-05
1981-05
Retirada
Resumen
The method is applicable to solid paraformaldehyde of aldehyde contents in the range 67 % (m/m) to 97 % (m/m). The principle consists in the reaction of aldehyde present in a test portion with neutralized sodium sulphite solution. Titration of the liberated sodium hydroxide with sulphuric acid solution using thymolphthalein as indicator. - This document has also been approved by the IUPAC.