NF EN ISO 20541

November 2008

Standard Current

Milk and milk products - Determination of nitrate content - Method by enzymatic reduction and molecular-absorption spectrometry after Griess reaction

ISO 20541|IDF 197:2008 specifies a method for the determination of the nitrate content of milk and milk products by molecular-absorption spectrometry after Griess reaction (preceded by enzymatic reduction).The method is, in particular, applicable to whole, partly skimmed, skimmed and dried milk, hard, semi-hard and soft cheeses, processed cheese, whey cheese, caseins, caseinates, dried whey and milk protein concentrates.The method can be used at contents corresponding to a measured concentration in the sample solution (with blank subtracted) of more than 0,2 mg/l.

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Main informations

Collections

National standards and national normative documents

Publication date

November 2008

Number of pages

23 p.

Reference

NF EN ISO 20541

ICS Codes

67.100.01 Milk and milk products in general

Classification index

V04-332

Print number

1 - 17/11/2008

International kinship

ISO 20541:2008

European kinship

EN ISO 20541:2008

Sumary

Milk and milk products - Determination of nitrate content - Method by enzymatic reduction and molecular-absorption spectrometry after Griess reaction

The method is, in particular, applicable to whole, partly skimmed, skimmed and dried milk, hard, semi-hard and soft cheeses, processed cheese, whey cheese, caseins, caseinates, dried whey and milk protein concentrates.

The method can be used at contents corresponding to a measured concentration in the sample solution (with blank subtracted) of more than 0,2 mg/l.

Table of contents

Avant-propos
iv
Avant-propos
v
1 Domaine d'application
1
2 Références normatives
1
3 Termes et définitions
1
4 Principe
2
5 Réactifs
2
6 Appareillage
4
7 Échantillonnage
5
8 Préparation de l'échantillon pour essai
5
8.1 Lait en poudre, lactosérum en poudre, concentrés de protéines de lait
5
8.2 Caséines et caséinates
5
8.3 Fromage
6
8.4 Fromage de lactosérum
6
9 Mode opératoire
6
9.1 Préparation de la prise d'essai
6
9.2 Élimination des matières grasses et des protéines
6
9.3 Essai à blanc du réactif
7
9.4 Détermination
7
9.5 Étalonnage
9
10 Calcul et expression des résultats
9
10.1 Teneur en nitrite (blanc de la matrice) (voir Article 4, Note 3)
9
10.2 Teneur totale en nitrite/nitrate
9
10.3 Teneur en nitrate
10
11 Fidélité
10
11.1 Essai interlaboratoires
10
11.2 Répétabilité
10
11.3 Reproductibilité
11
12 Rapport d'essai
11
Annexe A (informative) Essais interlaboratoires
12
Bibliographie
15

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