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ISO 5397:1984
M00002208
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ISO 5397:1984 Leather -- Determination of nitrogen content and hide substance -- Titrimetric method
standard by International Organization for Standardization, 03/01/1984
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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.