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I.S. EN ISO 20541:2008

Current
Current

The latest, up-to-date edition.

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

Preview

For Harmonized Standards, check the EU site to confirm that the Standard is cited in the Official Journal.

Only cited Standards give presumption of conformance to New Approach Directives/Regulations.

Foreword
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 test
   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

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).

DocumentType
Standard
Pages
28
PublisherName
National Standards Authority of Ireland
Status
Current

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

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
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

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