Foreword
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Sampling
8 Preparation of test sample
8.1 Dried milk, dried whey and milk
protein concentrates
8.2 Caseins and caseinates
8.3 Cheese
8.4 Whey cheese
9 Procedure
9.1 Preparation of the test portion
9.2 Removal of fat and protein
9.3 Reagent blank test
9.4 Determination
9.5 Calibration
10 Calculation and expression of results
10.1 Nitrite (matrix blank) content
10.2 Total nitrite/nitrate content
10.3 Nitrate content
11 Precision
11.1 Interlaboratory testing
11.2 Repeatability
11.3 Reproducibility
12 Test report
Annex A (informative) - Interlaboratory trials
Bibliography