Reference number
ISO 5397:1984
ISO 5397:1984
© ISO 2024
International Standard
ISO 5397:1984
Leather — Determination of nitrogen content and "hide substance" — Titrimetric method
Edition 1
1984-03
1984-03
ISO 5397:1984
11439
Published
(Edition 1, 1984)
This publication was last reviewed and confirmed in 2021.
Therefore this version remains current.
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.