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BS EN ISO 20483:2013

BS EN ISO 20483:2013

$102.76

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

Published By Publication Date Number of Pages
BSI 2013 22
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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.

PDF Catalog

PDF Pages PDF Title
4 Foreword
6 Foreword
7 Section sec_1
Section sec_2
Section sec_3
Section sec_3.1
Section sec_3.2
1 Scope
2 Normative references
3 Terms and definitions
8 Section sec_4
Section sec_5
Section sec_5.1
Section sec_5.2
Section sec_5.3
Section sec_5.4
Section sec_5.5
Section sec_5.6
Section sec_5.7
Section sec_5.7.1
Section sec_5.7.2
4 Principle
5 Reagents
9 Section sec_5.8
Section sec_5.9
Section sec_5.10
Section sec_5.11
Section sec_5.12
Section sec_5.13
Section sec_6
Section sec_6.1
Section sec_6.2
Section sec_6.3
Section sec_6.4
Section sec_7
Section sec_8
6 Apparatus
7 Sampling
8 Preparation of test sample
10 Section sec_9
Section sec_10
Section sec_10.1
Section sec_10.2
Section sec_10.3
Section sec_10.3.1
Section sec_10.3.2
9 Determination of the moisture content
10 Procedure
10.1 General
10.2 Test portion
10.3 Determination
11 Section sec_10.3.3
Section sec_10.4
Section sec_10.5
Section sec_11
Section sec_11.1
10.4 Blank test
10.5 Test with reference material (check test)
11 Expression of results
11.1 Nitrogen content
12 Section sec_11.2
Section sec_12
Section sec_12.1
Section sec_12.2
Section sec_12.3
Section sec_12.4
Section sec_12.4.1
11.2 Crude protein content
12 Precision
12.1 Interlaboratory test
12.2 Repeatability
12.3 Reproducibility
12.4 Critical difference
13 Section sec_12.4.2
Section sec_13
13 Test report
14 Annex sec_A
Table tab_A.1
Annex A
(informative)

Results of interlaboratory tests

15 Table tab_d
Figure fig_A.1
16 Annex sec_B
Annex sec_B.1
Annex sec_B.2
Annex B
(informative)

Critical difference and practical application of the repeatability and reproducibility limits to different protein contents

17 Table tab_B.1
18 Annex sec_C
Table tab_C.1
Annex C
(informative)

Factors for converting nitrogen content to protein content

19 Reference ref_1
Reference ref_2
Reference ref_3
Reference ref_4
Reference ref_5
Reference ref_6
Reference ref_7
Reference ref_8
Reference ref_9
Reference ref_10
Reference ref_11
Reference ref_12
Bibliography

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BS EN ISO 20483:2013
$102.76