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BS EN ISO 14891:2002

Current
Current

The latest, up-to-date edition.

Milk and milk products. Determination of nitrogen content. Routine method using combustion according to the Dumas principle
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

10-05-2002

Foreword
1 Scope
2 Normative reference
3 Term and definition
4 Principle
5 Reagents
6 Apparatus
7 Sampling
8 Preparation of test sample
    8.1 General
    8.2 Liquid test samples
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
    10.2 Expression of results
11 Precision
    11.1 Interlaboratory test
    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) Comparison of results using the
        Dumas method with those obtained by the
        Kjeldahl method
Bibliography

Covers a method for the determination of the total nitrogen content of milk and milk products.

Committee
AW/5
DevelopmentNote
Supersedes 99/703375 DC (04/2002)
DocumentType
Standard
Pages
26
PublisherName
British Standards Institution
Status
Current
Supersedes

ISO 8968-1:2014 Milk and milk products — Determination of nitrogen content — Part 1: Kjeldahl principle and crude protein calculation
ISO 5725-1:1994 Accuracy (trueness and precision) of measurement methods and results — Part 1: General principles and definitions
ISO 707:2008 Milk and milk products — Guidance on sampling
ISO 8968-2:2001 Milk Determination of nitrogen content Part 2: Block-digestion method (Macro method)
EN ISO 8968-1:2014 Milk and milk products - Determination of nitrogen content - Part 1: Kjeldahl principle and crude protein calculation (ISO 8968-1:2014)
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 6732:2010 Milk and milk products — Determination of iron content — Spectrometric method (Reference method)

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