Numéro de référence
ISO 743:1976
ISO 743:1976
© ISO 2025
ISO 743:1976
Carbonate de sodium à usage industriel — Dosage des sulfates — Méthode gravimétrique à l'état de sulfate de baryum
Edition 1
1976-02
1976-02
Annulée
Résumé
The principle in dissolution of a test portion and separation of the insoluble matter. Precipitation of sulphate as barium sulphate in dilute hydrochloric acid medium. Separation of the precipitate obtained and ignition at 800 °C +- 25 °C and weighing. The method is applicable to products having a sodium sulphate content equal to or greater than 0,01 % (m/m). Replaces ISO Recommendation R 743-1968.