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I.S. EN ISO 16634-1:2008

Current
Current

The latest, up-to-date edition.

FOOD PRODUCTS - DETERMINATION OF THE TOTAL NITROGEN CONTENT BY COMBUSTION ACCORDING TO THE DUMAS PRINCIPLE AND CALCULATION OF THE CRUDE PROTEIN CONTENT - PART 1: OILSEEDS AND ANIMAL FEEDING STUFFS
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

01-01-2008

Preview

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Sampling
8 Preparation of test sample
9 Procedure
   9.1 General
   9.2 Test portion
   9.3 Control of oxygen demand
   9.4 Calibration
   9.5 Determination
   9.6 Detection and integration
10 Calculation and expression of results
   10.1 Calculation
        10.1.1 Nitrogen content
        10.1.2 Crude protein content
   10.2 Expression of results
11 Precision
   11.1 Interlaboratory tests
   11.2 Repeatability
   11.3 Reproducibility
12 Test report
Annex A (informative) - Flowchart for the basic design of
        a Dumas apparatus
Annex B (informative) - Schemes of suitable types of
        Dumas apparatus
Annex C (informative) - Equipment calibration
Annex D (informative) - Examples of factors for converting
        nitrogen content to protein content
Annex E (informative) - Result of collaborative studies
Annex F (informative) - Relationship between Dumas nitrogen
        and Kjeldahl nitrogen
Bibliography

Defines a method for the determination of the total nitrogen content and the calculation of crude protein content of oilseeds and animal feeding stuffs.

DocumentType
Standard
Pages
44
PublisherName
National Standards Authority of Ireland
Status
Current

Standards Relationship
ISO 16634-1:2008 Identical
EN ISO 16634-1:2008 Identical

ISO 5725-1:1994 Accuracy (trueness and precision) of measurement methods and results — Part 1: General principles and definitions
ISO 1871:2009 Food and feed products General guidelines for the determination of nitrogen by the Kjeldahl method
ISO 5983-1:2005 Animal feeding stuffs Determination of nitrogen content and calculation of crude protein content Part 1: Kjeldahl method
ISO 20483:2013 Cereals and pulses — Determination of the nitrogen content and calculation of the crude protein content — Kjeldahl method
ISO 664:2008 Oilseeds Reduction of laboratory sample to test sample
ISO 6497:2002 Animal feeding stuffs Sampling
ISO 14891:2002 Milk and milk products Determination of nitrogen content Routine method using combustion according to the Dumas principle
ISO 6496:1999 Animal feeding stuffs — Determination of moisture and other volatile matter content
ISO 13690:1999 Cereals, pulses and milled products Sampling of static batches
ISO 5983-2:2009 Animal feeding stuffs Determination of nitrogen content and calculation of crude protein content Part 2: Block digestion and steam distillation method
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 6498:2012 Animal feeding stuffs — Guidelines for sample preparation
ISO 5500:1986 Oilseed residues Sampling
ISO 542:1990 Oilseeds — Sampling
ISO 665:2000 Oilseeds Determination of moisture and volatile matter content

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