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BSI
BS EN ISO 20483:2013

BS EN ISO 20483:2013

Current

Current

The latest, up-to-date edition.

Cereals and pulses. Determination of the nitrogen content and calculation of the crude protein content. Kjeldahl method

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-12-2013

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 Determination of the moisture content
10 Procedure
11 Expression of results
12 Precision
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

Defines 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.

This International Standard 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. If it is important to determine the non-protein nitrogen content, an appropriate method would be applied.

NOTE In certain cases, full recovery of the nitrogen in nitrates and nitrites is not possible by this method.

Committee
AW/4
DevelopmentNote
Supersedes 05/30131416 DC. (11/2006) Supersedes 12/30251275 DC. (01/2014)
DocumentType
Standard
Pages
22
PublisherName
British Standards Institution
Status
Current
Supersedes

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 3188:1978 Starches and derived products — Determination of nitrogen content by the Kjeldahl method — Titrimetric method
ISO 712:2009 Cereals and cereal products — Determination of moisture content — Reference method
ISO 5725-3:1994 Accuracy (trueness and precision) of measurement methods and results — Part 3: Intermediate measures of the precision of a standard measurement method
ISO 5725-6:1994 Accuracy (trueness and precision) of measurement methods and results — Part 6: Use in practice of accuracy values
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 6540:1980 Maize Determination of moisture content (on milled grains and on whole grains)
ISO 24333:2009 Cereals and cereal products — Sampling
ISO 24557:2009 Pulses Determination of moisture content Air-oven method

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Hardcopy - English
PDF - English
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