MILK AND MILK PRODUCTS - DETERMINATION OF NITRATE CONTENT - METHOD BY ENZYMATIC REDUCTION AND MOLECULAR-ABSORPTION SPECTROMETRY AFTER GRIESS REACTION

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

01-01-2008

Publisher

German Institute for Standardisation (Deutsches Institut für Normung)

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Sampling
8 Preparation of test sample
   8.1 Dried milk, dried whey and milk protein concentrates
   8.2 Caseins and caseinates
   8.3 Cheese
   8.4 Whey cheese
9 Procedure
   9.1 Preparation of the test portion
   9.2 Removal of fat and protein
   9.3 Reagent blank tes
   9.4 Determination
   9.5 Calibration
10 Calculation and expression of results
   10.1 Nitrite (matrix blank) content
   10.2 Total nitrite/nitrate content
   10.3 Nitrate content
11 Precision
   11.1 Interlaboratory testing
   11.2 Repeatability
   11.3 Reproducibility
12 Test report
Annex A (informative) Interlaboratory trials
Bibliography
National Annex NA (informative) Bibliography

Describes 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).

DevelopmentNote	Supersedes DIN 10476 E. (01/2009)
DocumentType	Standard
Pages	22
PublisherName	German Institute for Standardisation (Deutsches Institut für Normung)
Status	Current
Supersedes	DIN 10476:2001-11

Standards	Relationship
EN ISO 20541:2008	Identical
ISO 20541:2008	Identical

DIN EN ISO 835 E : 2007	LABORATORY GLASSWARE - GRADUATED PIPETTES
DIN ISO 5725-2:2002-12	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 5725-2:1994 including Technical Corrigendum 1:2002)
ISO 707:2008	Milk and milk products — Guidance on sampling
ISO 1042:1998	Laboratory glassware One-mark volumetric flasks
ISO 648:2008	Laboratory glassware — Single-volume pipettes
ISO 835:2007	Laboratory glassware — Graduated pipettes
ISO 565:1990	Test sieves — Metal wire cloth, perforated metal plate and electroformed sheet — Nominal sizes of openings
DIN EN ISO 707 E : 2009	MILK AND MILK PRODUCTS - GUIDANCE ON SAMPLING
EN 12014-3:2005	Foodstuffs - Determination of nitrate and/or nitrite content - Part 3: Spectrometric determination of nitrate and nitrite content of meat products after enzymatic reduction of nitrate to nitrite
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 3696:1987	Water for analytical laboratory use — Specification and test methods
DIN ISO 3696:1991-06	WATER FOR ANALYTICAL LABORATORY USE - SPECIFICATION AND TEST METHODS

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DIN EN ISO 20541 E : 2008

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