This part of ISO 5983 specifies a method for the determination of the nitrogen content of animal feeding stuffs by the Kjeldahl process, and a method for the calculation of the crude protein content. The method does not measure oxidized forms of nitrogen or heterocyclic nitrogen compounds. This method does not distinguish between protein nitrogen and non-protein nitrogen. If it is important to determine the content of non-protein nitrogen, an appropriate method should be used.
BS EN ISO 5983-1:2005 Referenced Document
ISO 6498 Animal feeding stuffs - Guidelines for sample preparation*， 2012-06-01 Update
BS EN ISO 5983-1:2005 history
0000 BS EN ISO 5983-1:2005(2009)
2005BS EN ISO 5983-1:2005 Animal feeding stuffs - Determination of nitrogen content and calculation of crude protein content - Kjeldahl method