Numéro de référence
ISO 2051:1976
ISO 2051:1976
© ISO 2024
ISO 2051:1976
Chlorure de potassium à usage industriel — Dosage du potassium — Méthode gravimétrique à l'état de tétraphénylborate de potassium
Edition 1
1976-02
1976-02
Annulée
Résumé
The method is applicable to products having a minimum KCL content of about 95 % (m/m). The principle consists in dissolution of a test portion taken from the laboratory sample, previously ground and sifted. Addition of formaldehyde solution to transform any ammonium ions present into hexamethylenetetramine, and of ethylenedinitrilotetraacetic acid, disodium salt, to complex any extraneous cations present which could cause excess errors. These*additions in no case have a detrimental effect on its precision or reproducibility. Precipitation of the potassium by sodium tetraphenylborate in a weakly alkaline medium, drying and weighing of the precipitate.