ISO 20483:2013 specifies a method for the determination of the nitrogen content of cereals, pulses and derived products, according to the Kjeldahl method, and a method for calculating the crude protein content. The method does not distinguish between protein nitrogen and non-protein nitrogen.
Tämän julkaisun valmistelusta Suomessa vastaa SFS Suomen Standardit, puh. 09 149 9331.
Sisällysluettelo
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 Results of interlaboratory tests (informative)
Annex B Critical difference and practical application of the repeatability and reproducibility limits to different protein contents (informative)
Annex C Factors for converting nitrogen content to protein content (informative)
ISO 24557:2009 Pulses -- Determination of moisture content -- Air-oven method
ISO 6540:1980 Maize -- Determination of moisture content (on milled grains and on whole grains)
ISO 712:2009 Cereals and cereal products -- Determination of moisture content -- Reference method
ISO 24557:2009 Pulses -- Determination of moisture content -- Air-oven method
ISO 6540:1980 Maize -- Determination of moisture content (on milled grains and on whole grains)
ISO 712:2009 Cereals and cereal products -- Determination of moisture content -- Reference method