BS EN ISO 5983-2:2009
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
Hardcopy , PDF
English
31-07-2009
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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.
| Committee |
AW/10
|
| DevelopmentNote |
Supersedes 04/30109011 DC. (09/2005)
|
| DocumentType |
Standard
|
| Pages |
22
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
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.
| Standards | Relationship |
| I.S. EN ISO 5983-2:2009 | Identical |
| UNI EN ISO 5983-2 : 2009 | Identical |
| ISO 5983-2:2009 | Identical |
| NEN EN ISO 5983-2 : 2009 | Identical |
| NBN EN ISO 5983-2 : 2009 | Identical |
| EN ISO 5983-2:2009 | Identical |
| NF EN ISO 5983-2 : 2009 | Identical |
| NS EN ISO 5983-2 : 2009 | Identical |
| UNE-EN ISO 5983-2:2009 | Identical |
| DIN EN ISO 5983-2:2009-10 | Identical |
| 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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