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EN ISO 8968-1:2014

Current
Current

The latest, up-to-date edition.

Milk and milk products - Determination of nitrogen content - Part 1: Kjeldahl principle and crude protein calculation (ISO 8968-1:2014)
Published date

05-02-2014

Forewords
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Sampling
8 Preparation of test sample
9 Procedures
10 Calculation and expression of results
11 Precision
12 Test report
Annex A (informative) - Test portion
Annex B (informative) - Collaborative trials
Bibliography

ISO 8968-1|IDF 20-1:2014 specifies a method for the determination of the nitrogen content and crude protein calculation of milk and milk products by the Kjeldahl principle, using traditional and block digestion methods. The methods are applicable to: liquid cow's (whole, partially skimmed or skimmed milk), goat's and sheep's whole milk; hard, semi-hard and processed cheese; dried milk and dried milk products (including milk-based infant formulae, milk protein concentrate, whey protein concentrate, casein and caseinate). The methods are not applicable to samples containing ammonium caseinate.

Committee
CEN/TC 302
DevelopmentNote
Supersedes PREN ISO 8968-1 & EN ISO 8968-2. (02/2014)
DocumentType
Standard
PublisherName
Comite Europeen de Normalisation
Status
Current
Supersedes

BS EN ISO 14891:2002 Milk and milk products. Determination of nitrogen content. Routine method using combustion according to the Dumas principle
ISO 14891:2002 Milk and milk products Determination of nitrogen content Routine method using combustion according to the Dumas principle
EN ISO 14891 : 2002 MILK AND MILK PRODUCTS - DETERMINATION OF NITROGEN CONTENT - ROUTINE METHOD USING COMBUSTION ACCORDING TO THE DUMAS PRINCIPLE

ISO 5725-1:1994 Accuracy (trueness and precision) of measurement methods and results — Part 1: General principles and definitions
ISO 385:2005 Laboratory glassware Burettes
ISO 707:2008 Milk and milk products — Guidance on sampling
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 8655-3:2002 Piston-operated volumetric apparatus Part 3: Piston burettes

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