Numéro de référence
ISO 3138:1974
ISO 3138:1974
© ISO 2024
ISO 3138:1974
Fluorure d'hydrogène anhydre à usage industriel — Dosage des acides non volatils — Méthode titrimétrique
Edition 1
1974-12
1974-12
Annulée
Résumé
Applicable to contents of between 0.005 % (m/m) and 0.3 % (m/m) expressed in sulphuric acid. Preparation of the samples according to ISO 3137. Removal of volatile acids by evaporation and titration of the remaining acidity with standard volumetric sodium hydroxide solution in the presence of phenolphthalein as indicator. The evaporation is carried out on a boiling water bath in a fume cupboard.