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AS 2300.1.2.1-1991
$47.81
Methods of chemical and physical testing for the dairying industry, Method 1.2.1: General methods and principles — Determination of nitrogen — Reference Kjeldahl method
This Standard sets out the reference Kjeldahl method for the determination of nitrogen in milk, milk fractions and milk products. The method allows for the estimation of nitrogen on a mass/mass basis and a mass/volume basis.
Table of contents
Header
About this publication
PREFACE
FOREWORD
1 SCOPE
2 REFERENCED DOCUMENTS
3 PRINCIPLE
4 REACTIONS
5 REAGENTS
5.1 General
5.2 Sulfuric acid
5.3 Copper sulfate
5.4 Potassium sulfate
5.5 Hydrogen peroxide
5.6 Sodium hydroxide
5.7 Boric acid
5.8 Sulfuric acid
5.9 Mixed indicator (optional)
5.10 Tryptophan (C11H12N2O2)
5.11 Ammonium sulphate
6 APPARATUS
6.1
6.2
6.3
6.4
6.5
6.6 Glass beads or anti-bumping granules
6.7
6.8
7 NITROGEN RECOVERY TESTS
7.1 General
7.2 Tryptophan recovery test
7.3 Ammonium sulfate recovery test
7.4 Corrective action
8 PREPARATION OF TEST SAMPLE
8.1 Liquid milks and cream
8.2 Dried milks, caseinates and coprecipitates
8.3 Ice cream and frozen milk products
8.4 Cheese
8.5 Sweetened condensed milk
8.6 Evaporated milk
8.7 Yogurt
8.8 Caseins
9 TEST PORTIONS
10 PROCEDURE
10.1 Blank test
10.2 Method
11 CALCULATION
12 PRECISION (see References 1 and 2)
12.1 Repeatability
12.2 Reproducibility
13 TEST REPORT
14 REFERENCES
APPENDIX A
A1 SCOPE
A2 BLOCK DIGESTION APPARATUS
A3 STEAM DISTILLATION
A4 REDUCED TEST PORTION
Cited references in this standard
Please select a variation to view its description.
| Published | 09/08/1991 |
|---|---|
| Pages | 7 |
Please select a variation to view its pdf.
