ISO 5397:1984
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Leather — Determination of nitrogen content and “hide substance” — Titrimetric method
| Published By | Publication Date | Number of Pages |
| ISO | 1984-03 | 8 |
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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