Numéro de référence
ISO 2515:1973
ISO 2515:1973
© ISO 2024
ISO 2515:1973
Bicarbonate d'ammonium à usage industriel (y compris les industries alimentaires) — Dosage de l'azote ammoniacal — Méthode volumétrique après distillation
Edition 1
1973-04
1973-04
Annulée
Résumé
Specifies a titrimetric method consisting in distillation of the ammonia after displacement by an alkaline solution; absorption in an excess of standard volumetric sulphuric acid solution and back-titration with standard volumetric sodium hydroxide solution in the presence of an indicator. The absorption of the ammonia may also be carried out in an excess of boric acid solution. The titration, in this case, is carried out directly with a standard volumetric sulphuric acid solution.