
Leather — Determination of nitrogen content and "hide substance" — Titrimetric method
NORMA vydaná dňa 1.3.1984
Označenie normy: ISO 5397:1984
Dátum vydania normy: 1.3.1984
Počet strán: 3
Približná hmotnosť: 9 g (0.02 libier)
Krajina: Medzinárodná technická norma
Kategória: 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.