DIN EN ISO 20541:2008-12
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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Vorwort
1 Anwendungsbereich
2 Normative Verweisungen
3 Begriffe
4 Kurzbeschreibung
5 Reagenzien
6 Geräte
7 Probenahme
8 Vorbereitung der Untersuchungsprobe
8.1 Milchpulver, Molkenpulver und
Milcheiweisskonzentrate
8.2 Caseine und Caseinate
8.3 Käse
8.4 Molkenkäse
9 Durchführung
9.1 Herstellung der Einwaage
9.2 Abtrennung von Fett und Protein
9.3 Reagenzien-Blindversuch
9.4 Bestimmung
9.5 Kalibrierung
10 Berechnung und Auswertung
10.1 Nitritgehalt (Matrix-Blindwert)
10.2 Gesamtgehalt an Nitrit/Nitrat
10.3 Nitratgehalt
11 Präzision
11.1 Ringversuch
11.2 Wiederholpräzision
11.3 Vergleichpräzision
12 Untersuchungsbericht
Anhang A (informativ) Ringversuche
Literaturhinweise
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. (12/2008)
|
| DocumentType |
Standard
|
| Pages |
22
|
| PublisherName |
German Institute for Standardisation (Deutsches Institut für Normung)
|
| Status |
Current
|
| Standards | Relationship |
| EN ISO 20541:2008 | Identical |
| ISO 20541:2008 | Identical |
| 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 |
| 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 |
| DIN ISO 565:1998-12 | TEST SIEVES - METAL WIRE CLOTH, PERFORATED METAL PLATE AND ELECTROFORMED SHEET - NOMINAL SIZES OF OPENINGS |
| 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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