NF EN ISO 20483

NF EN ISO 20483

January 2014
Standard Current

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

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.

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Main informations

Collections

National standards and national normative documents

Publication date

January 2014

Number of pages

22 p.

Reference

NF EN ISO 20483

ICS Codes

67.060   Cereals, pulses and derived products

Classification index

V03-750

Print number

1 - 26/12/2013

International kinship

ISO 20483:2013

European kinship

EN ISO 20483:2013
Sumary
Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method

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.

Replaced standards (1)
NF EN ISO 20483
January 2007
Standard Cancelled
Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method

ISO 20483:2006 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 can be applied.

Table of contents
  • Avant-propos
    iv
  • 1 Domaine d'application
    1
  • 2 Références normatives
    1
  • 3 Termes et définitions
    1
  • 4 Principe
    2
  • 5 Réactifs
    2
  • 6 Appareillage
    3
  • 7 Échantillonnage
    3
  • 8 Préparation de l'échantillon pour essai
    4
  • 9 Détermination de la teneur en eau
    4
  • 10 Mode opératoire
    4
  • 10.1 Généralités
    4
  • 10.2 Prise d'essai
    4
  • 10.3 Détermination
    4
  • 10.4 Essai à blanc
    5
  • 10.5 Essai avec matériau de référence (Essai de contrôle)
    5
  • 11 Expression des résultats
    6
  • 11.1 Teneur en azote
    6
  • 11.2 Teneur en protéines brutes
    6
  • 12 Fidélité
    6
  • 12.1 Essai interlaboratoires
    6
  • 12.2 Répétabilité
    6
  • 12.3 Reproductibilité
    7
  • 12.4 Différence critique
    7
  • 13 Rapport d'essai
    8
  • Annexe A (informative) Résultats des essais interlaboratoires
    9
  • Annexe B (informative) Différence critique et application pratique des limites de répétabilité et de reproductibilité à différentes teneurs en protéines
    11
  • Annexe C (informative) Facteurs permettant de convertir la teneur en azote en teneur en protéines
    13
  • Bibliographie
    14
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