NEN EN ISO 8968-1 : 2014

Foreword
1 Scope
2 Normative reference
3 Term and definition
4 Principle
5 Reagents
6 Apparatus
7 Sampling
8 Preparation of test sample
9 Procedure
   9.1 Test portion and pretreatment
   9.2 Determination
   9.3 Blank test
   9.4 Recovery tests
10 Calculation and expression of results
   10.1 Calculation of nitrogen content
   10.2 Calculation of crude protein content
11 Precision
   11.1 Interlaboratory test
   11.2 Repeatability
   11.3 Reproducibility
12 Test report
Annex A (informative) Modified procedure for analysis
        of other milk products when a separate standard
        for that product does not exist
Bibliography

Defines 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.