I.S. EN ISO 20541:2008
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
Hardcopy , PDF
English
01-01-2008
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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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