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BS ISO 21422:2018 Milk, milk products, infant formula and adult nutritionals. Determination of chloride. Potentiometric titration method, 2021
- National foreword
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Principle
- 5 Reagents
- 6 Preparation of solutions [Go to Page]
- 6.1 Standardized AgNO3 solution, c = 0,1 mol/l.
- 6.2 NaCl solution, c = 0,1 mol/l.
- 6.3 Precipitating solution (Carrez) I.
- 6.4 Precipitating solution (Carrez) II.
- 6.5 HNO3 solution, c = 4 mol/l.
- 6.6 AgNO3 solution, c = 0,025 mol/l (optional).
- 6.7 NaCl solution, c = 0,025 mol/l (optional).
- 6.8 KNO3 solution, c = 1 mol/l.
- 7 Apparatus
- 8 Sample preparation [Go to Page]
- 8.1 Powders, for milk, milk products and infant formula
- 8.2 Cheese, for hard or rinded cheese
- 8.3 Butter
- 9 Extraction [Go to Page]
- 9.1 Cheese
- 9.2 Butter
- 9.3 Milk, milk products, infant formula and adult nutritional products
- 9.4 Procedure
- 10 Instrument operating conditions [Go to Page]
- 10.1 Check and maintenance of the combined silver electrode
- 10.2 Titration
- 10.3 Determination of very low amounts of chloride
- 10.4 Blank test
- 11 System suitability test
- 12 Calculations
- 13 Precision [Go to Page]
- 13.1 General
- 13.2 Repeatability
- 13.3 Reproducibility
- 14 Test report
- Annex A (informative) Examples of titration end point determination
- Annex B (informative) Precision data
- Annex C (informative) Comparison of results between sample extraction with and without additional protein precipitation
- Bibliography [Go to Page]
