Numéro de référence
ISO 1917:1972
ISO 1917:1972
© ISO 2024
ISO 1917:1972
Perborates de sodium hydratés à usage industriel — Détermination des teneurs en oxyde de sodium, en oxyde borique et en oxygène actif — Méthodes volumétriques
Edition 1
1972-05
1972-05
Annulée
Résumé
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.