ISO 4321:1977

Washing powders — Determination of active oxygen content — Titrimetric method

Publication date:   Sep 1, 1977

General information

90.20 Standard under periodical review   Jan 15, 2022


ISO/TC 91 Surface active agents

International Standard

71.100.40   Surface active agents



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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.

Life cycle


ISO 4321:1977
90.20 Standard under periodical review
Jan 15, 2022