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Washing powders -- Determination of active oxygen content -- Titrimetric method
The determination consists in co-reduction, with liberation of oxygen, of the peroxyhydrate and potassium permanganate in an acid solution.
Because of the *specificity* 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 avoided by adoption of a particular method of dissolution appropriate to the determination of active oxygen content.
This method may be used for determining peroxyhydrates, for example *sodium perborate*.
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