Due to the specificity of the washing powders and the relative stability of the peroxyhydrates, the washing powders are likely to be incompletely dissolved, resulting in loss of oxygen; these disadvantages are avoided by adopting a special dissolution method suitable for determining the active oxygen content.
This International Standard specifies a method for determining the active oxygen content of commercial washing powders.
This method can be used to identify peroxyhydrates such as sodium perborate; It should not be used for washing powders containing products that react with acid permanganates in addition to peroxyhydrates under analytical conditions.
The method can be used in the presence of (ethylenedinitrilo) tetraacetic acid (EDTA) or other chelating agents of the same type, provided that the concentration of these products does not exceed 1% (m/m).
The main principle is the reduction of peroxyhydrate and potassium permanganate with the release of oxygen in an acid solution.
The relatively long induction time that can occur with some washing powders can be avoided by adding manganese sulfate.
Bismuth nitrate forms complexes with EDTA or any other amine acetate-based chelating agent, eliminating all possible interference.
If aluminum sulfate is added, a preferential reaction with condensed phosphates can be achieved and a complex formation can be achieved with manganese ions, which can occur in some cases and lead to a blunt endpoint. avoided.
Only accepted analytical grade reagents and only distilled water or water of equivalent purity should be used during analysis.
Among the services provided by our organization within the framework of material testing services, there are also ISO 4321 standard tests.
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