ISO 5397:1984 (IULTCS/IUC 10) Preview
Leather -- Determination of nitrogen content and "hide substance" -- Titrimetric method
This standard was last reviewed and confirmed in 2016. Therefore this version remains current.
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.
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