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ISO 5983-2:2009

Animal feeding stuffs — Determination of nitrogen content and calculation of crude protein content — Part 2: Block digestion and steam distillation method

Publication date:   May 26, 2009

General information

90.20 Standard under periodical review   Oct 15, 2024

ISO

ISO/TC 34/SC 10 Animal feeding stuffs

International Standard

65.120   Animal feeding stuffs

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Scope

ISO 5983-2:2009 specifies a method for the determination of nitrogen content of animal feeding stuffs according to the Kjeldahl method, and a method for the calculation of the crude protein content.
It is suitable for use as a semi-micro rapid routine method using block digestion, copper catalyst, and steam distillation into boric acid.
The method is applicable to the determination of greater than 0,5 % mass fraction Kjeldahl nitrogen in animal feeding stuffs, pet foods, and their raw materials.
The method does not measure oxidized forms of nitrogen nor heterocyclic nitrogen compounds.
The method does not distinguish between protein nitrogen and non-protein nitrogen.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 5983-2:2005

NOW

PUBLISHED
ISO 5983-2:2009
90.20 Standard under periodical review
Oct 15, 2024