ISO 914:1977

Sulphuric acid and oleum for industrial use — Determination of total nitrogen content — Titrimetric method after distillation

The method is applicable to products having a total nitrogen content equal to or greater than 0.05 % (m/m). The principle consists in the conversion of the nitrogen present in a test portion to ammonia by means of nascent hydrogen. Distillation and absorption of the ammonia in an excess of standard volumetric sulphuric acid solution, and back-titration with a standard volumetric sodium hydroxide solution in the presence of an indicator. - Replaces ISO Recommendation R 914-1968.

OEN:

ISO

Langue:

English

Code(s) de l'ICS:

71.060.30

Statut:

Annulée

Date de Publication:

1977-10-31

Numéro Standard:

ISO 914:1977