ISO 5397:1984

Current Revision
Leather -- Determination of nitrogen content and hide substance -- Titrimetric method

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ISO 5397:1984

Leather -- Determination of nitrogen content and hide substance -- Titrimetric method

PUBLISH DATE 1984
ISO 5397:1984

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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