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UNI CEN ISO/TS 16634-2 : 2009

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

FOOD PRODUCTS - DETERMINATION OF THE TOTAL NITROGEN CONTENT BY COMBUSTION ACCORDING TO THE DUMAS PRINCIPLE AND CALCULATION OF THE CRUDE PROTEIN CONTENT - PART 2: CEREALS, PULSES AND MILLED CEREAL PRODUCTS
Superseded date

07-21-2016

Published date

01-01-2009

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 supply
   9.4 Calibration
   9.5 Determination
   9.6 Detection and integration
10 Calculation and expression of results
   10.1 Calculation
   10.2 Expression of results
11 Precision
   11.1 Interlaboratory tests
   11.2 Repeatability
   11.3 Reproducibility
   11.4 Critical difference
   11.5 Uncertainty
12 Test report
Annex A (informative) - Flowchart for a basic Dumas apparatus
Annex B (informative) - Schematic diagrams 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) - Results of interlaboratory tests
Bibliography

Describes a method for the determination of the total nitrogen content and the calculation of the crude protein content of cereals, pulses and milled cereal products.

DocumentType
Technical Specification
PublisherName
Ente Nazionale Italiano di Unificazione (UNI)
Status
Superseded
SupersededBy

Standards Relationship
ISO/TS 16634-2:2009 Identical
CEN ISO/TS 16634-2:2009 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 20483:2013 Cereals and pulses — Determination of the nitrogen content and calculation of the crude protein content — Kjeldahl method
ISO 712:2009 Cereals and cereal products — Determination of moisture content — Reference method
ISO 5725-6:1994 Accuracy (trueness and precision) of measurement methods and results — Part 6: Use in practice of accuracy values
ISO 14891:2002 Milk and milk products Determination of nitrogen content Routine method using combustion according to the Dumas principle
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 6540:1980 Maize Determination of moisture content (on milled grains and on whole grains)
ISO 24557:2009 Pulses Determination of moisture content Air-oven method

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