Reference number
ISO 4321:1977
ISO 4321:1977
© ISO 2024
International Standard
ISO 4321:1977
Washing powders — Determination of active oxygen content — Titrimetric method
Edition 1
1977-09
1977-09
ISO 4321:1977
10192
Published
(Edition 1, 1977)
This publication was last reviewed and confirmed in 2022.
Therefore this version remains current.
Abstract
The determination consists in co-reduction, with liberation of oxygen, of the peroxyhydrate and potassium permanganate in an acid solution. Because of the specifity of washing powders and the relative stability of peroxyhydrates, the dissolution of washing powders is likely to be incomplete and may result in a loss of oxygen; these disadvantages have been avoited by adoption of a particular method of dissolution appropriate to the determination of active oxygen content. This method may be used for determing peroxyhydrates, for example sodium perborate.