Name: EN ISO 16634-1:2008
Brand: CEN

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 (ISO 16634-1:2008)

Published date

01-11-2008

Publisher

Comite Europeen de Normalisation

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

ISO 16634-1:2008 specifies a method for the determination of the total nitrogen content and the calculation of crude protein content of oilseeds and animal feeding stuffs.This method, like the Kjeldahl method, does not distinguish between protein nitrogen and non-protein nitrogen. For the calculation of protein content, various conversion factors are used.This method is not applicable to milk and milk products.

Committee	CEN/TC 327
DocumentType	Standard
PublisherName	Comite Europeen de Normalisation
Status	Current

Standards	Relationship
I.S. EN ISO 16634-1:2008	Identical
NS EN ISO 16634-1 : 1ED 2008	Identical
NBN EN ISO 16634-1 : 2009	Identical
NF EN ISO 16634-1 : 2008	Identical
SN EN ISO 16634-1:2009	Identical
SS-EN ISO 16634-1:2008	Identical
PN EN ISO 16634-1 : 2008	Identical
UNE-EN ISO 16634-1:2009	Identical
ISO 16634-1:2008	Identical
DIN EN ISO 16634-1:2009-07	Identical
UNI EN ISO 16634-1 : 2009	Identical
NEN EN ISO 16634-1 : 2008	Identical
BS 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