ISO 1391-5:1981
Paraformaldehyde for industrial use; methods of test; determination of aldehyde content; titrimetric method

Standard No.

ISO 1391-5:1981

Release Date

1981

Published By

International Organization for Standardization (ISO)

Status

Withdraw 2002-05

Latest

ISO 1391-5:1981

Scope

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.

ISO 1391-5:1981 history

• 1981 ISO 1391-5:1981 Paraformaldehyde for industrial use; methods of test; determination of aldehyde content; titrimetric method