DIN EN ISO 5983-2:2009 PDF

Scope: This part of ISO 5983 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 net distinguish between protein nitrogen and non-protein nitrogen NOTE If it is of importance to determine the content of non-protein nitrogen, an appropriate method can be used.

DIN EN ISO 5983-2:2009 Referenced Document

ISO 1871 Food and feed products - General guidelines for the determination of nitrogen by the Kjeldahl method
ISO 6498 Animal feeding stuffs - Guidelines for sample preparation*， 2012-06-01 Update

2009 DIN EN ISO 5983-2:2009-10 Animal feeding stuffs - Determination of nitrogen content and calculation of crude protein content - Part 2: Block digestion and steam distillation method (ISO 5983-2:2009); German version EN ISO 5983-2:2009
2009 DIN EN 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 (ISO 5983-2:2009); English version of DIN EN ISO 5983-2:2009-10
2005 DIN EN ISO 5983-2:2005 Animal feeding stuffs - Determination of nitrogen content and calculation of crude protein content - Part 2: Block digestion/steam distillation method (ISO 5983-2:2005); German version EN ISO 5983-2:2005