NEN EN ISO 20483 : 2013
Current
The latest, up-to-date edition.
CEREALS AND PULSES - DETERMINATION OF THE NITROGEN CONTENT AND CALCULATION OF THE CRUDE PROTEIN CONTENT - KJELDAHL METHOD
01-12-2013
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Sampling
8 Preparation of test sample
9 Determination of the moisture content
10 Procedure
10.1 General
10.2 Test portion
10.3 Determination
10.4 Blank test
10.5 Test with reference material (Check test)
11 Expression of results
11.1 Nitrogen content
11.2 Crude protein content
12 Precision
12.1 Interlaboratory test
12.2 Repeatability
12.3 Reproducibility
12.4 Critical difference
13 Test report
Annex A (informative) Results of interlaboratory tests
Annex B (informative) Critical difference and practical
application of the repeatability and
reproducibility limits to different
protein contents
Annex C (informative) Factors for converting nitrogen content
to protein content
Bibliography
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