ISO 1917:1972
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Hydrated sodium perborates for industrial use Determination of sodium oxide, boric oxide and available oxygen contents Volumetric methods
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07-05-2019
English, French
01-05-1972
Determination of the sodium oxide content by addition of an excess of a solution of hydrochloric acid and back titration with a standard volumetric solution of sodium hydroxide in presence of methyl red/bromocresol green as indicator. Subsequent titration of the boric oxide with the standard volumetric solution of sodium hydroxide in the presence of mannitol or sorbitol, using phenolphthalein as indicator. Determination of the available oxygen content in a test portion by titration in acid solution with a standard volumetric potassium permanganate solution. The equation for the reaction involved in the determination of available oxygen is given.
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