BS EN ISO 16634-1:2008
The latest, up-to-date edition.
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2 Normative references
3 Terms and definitions
8 Preparation of test sample
9.2 Test portion
9.3 Control of oxygen demand
9.6 Detection and integration
10 Calculation and expression of results
10.1.1 Nitrogen content
10.1.2 Crude protein content
10.2 Expression of results
11.1 Interlaboratory tests
12 Test report
Annex A (informative) - Flowchart for the basic design of
a Dumas apparatus
Annex B (informative) - Schemes of suitable types of
Annex C (informative) - Equipment calibration
Annex D (informative) - Examples of factors for converting
nitrogen content to protein content
Annex E (informative) - Result of collaborative studies
Annex F (informative) - Relationship between Dumas nitrogen
and Kjeldahl nitrogen
Describes a method for the determination of the total nitrogen content and the calculation of crude protein content of oilseeds and animal feeding stuffs.
This part of ISO16634 specifies a method for the determination of the total nitrogen content and the calculation of crude protein content of oilseeds and animal feeding stuffs.
This method, like the Kjeldahl method, does not distinguish between protein nitrogen and non-protein nitrogen. For the calculation of protein content, various conversion factors are used (see AnnexD).
This method is not applicable to milk and milk products, for which a method is specified in ISO14891|IDF 185.
|Accuracy (trueness and precision) of measurement methods and results — Part 1: General principles and definitions
|Food and feed products General guidelines for the determination of nitrogen by the Kjeldahl method
|Animal feeding stuffs Determination of nitrogen content and calculation of crude protein content Part 1: Kjeldahl method
|Cereals and pulses — Determination of the nitrogen content and calculation of the crude protein content — Kjeldahl method
|Oilseeds Reduction of laboratory sample to test sample
|Animal feeding stuffs Sampling
|Milk and milk products Determination of nitrogen content Routine method using combustion according to the Dumas principle
|Animal feeding stuffs — Determination of moisture and other volatile matter content
|Cereals, pulses and milled products Sampling of static batches
|Animal feeding stuffs Determination of nitrogen content and calculation of crude protein content Part 2: Block digestion and steam distillation method
|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
|Animal feeding stuffs — Guidelines for sample preparation
|Oilseed residues Sampling
|Oilseeds — Sampling
|Oilseeds Determination of moisture and volatile matter content
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