ISO 4313:1976 Preview
Washing powders -- Determination of total phosphorus(V) oxide content -- Quinoline phosphomolybdate gravimetric method
This standard was last reviewed and confirmed in 2017. Therefore this version remains current.
The determination is carried out in the following way: Hydrolysis of polyphosphates by nitric acid. Precipitation of phosphates in the form of quinoline phosphomolybdate in acetone solution. Drying and weighing of the precipitate.
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