Leather — Determination of nitrogen content and "hide substance" — Titrimetric method
NORMA vydána dne 1.3.1984
Označení normy: ISO 5397:1984
Datum vydání normy: 1.3.1984
Počet stran: 3
Přibližná hmotnost: 9 g (0.02 liber)
Země: Mezinárodní technická norma
Kategorie: Technické normy ISO
Description / Abstract: The principle consists in decomposition of a test portion by Kjeldahl method, distillation of the ammonia liberated, determination of the nitrogen content by titration of the ammonia with sulfuric or hydrochloric acid, using phenolphthalein as indicator. The method is applicable to all types of leather in all types of tannage.