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BS EN ISO 5983-2:2009

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Current

The latest, up-to-date edition.

Animal feeding stuffs. Determination of nitrogen content and calculation of crude protein content Block digestion and steam distillation method
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-07-2009

Publisher

British Standards Institution

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Sampling
8 Preparation of test sample
9 Procedure
   9.1 General
   9.2 Test portion
   9.3 Determination
   9.4 Blank test
   9.5 Recovery tests
10 Calculation and expression of results
   10.1 Calculation
   10.2 Calculation of crude protein content
   10.3 Expression of crude protein content results
11 Precision
   11.1 Interlaboratory tests
   11.2 Repeatability
   11.3 Reproducibility
12 Test report
Annex A (informative) - Results of interlaboratory tests
Annex B (informative) - Results of a proficiency test; comparison
        of the colorimetric and potentiometric endpoint
        determination of the titration
Bibliography

Describes 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.

This part of ISO5983 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.

NOTE If it is of importance to determine the content of non-protein nitrogen, an appropriate method can be used.

Committee
AW/10
DevelopmentNote
Supersedes 04/30109011 DC. (09/2005)
DocumentType
Standard
Pages
22
PublisherName
British Standards Institution
Status
Current
Supersedes

ISO 5725-1:1994 Accuracy (trueness and precision) of measurement methods and results — Part 1: General principles and definitions
ISO 8655-5:2002 Piston-operated volumetric apparatus Part 5: Dispensers
ISO 1871:2009 Food and feed products General guidelines for the determination of nitrogen by the Kjeldahl method
ISO 5983-1:2005 Animal feeding stuffs Determination of nitrogen content and calculation of crude protein content Part 1: Kjeldahl method
ISO 385:2005 Laboratory glassware Burettes
ISO 6497:2002 Animal feeding stuffs Sampling
ISO 8655-2:2002 Piston-operated volumetric apparatus Part 2: Piston pipettes
ISO 5725-2:1994 Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method
ISO 6498:2012 Animal feeding stuffs — Guidelines for sample preparation
ISO 8655-3:2002 Piston-operated volumetric apparatus Part 3: Piston burettes

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Hardcopy - English
PDF - English
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