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BS ISO 21422:2018:2021 Edition

BS ISO 21422:2018:2021 Edition

$142.49

Milk, milk products, infant formula and adult nutritionals. Determination of chloride. Potentiometric titration method

Published By Publication Date Number of Pages
BSI 2021 26
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This document specifies a method for the determination of chloride in milk, milk products, infant formula and adult nutritionals by potentiometry[1][2][3][4] with an analytical range of 0,35 mg chloride/100 g to 711,6 mg chloride/100 g product, or ready-to-feed products.

PDF Catalog

PDF Pages PDF Title
2 National foreword
6 Foreword
9 1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
10 6 Preparation of solutions
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.
11 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
12 8 Sample preparation
8.1 Powders, for milk, milk products and infant formula
8.2 Cheese, for hard or rinded cheese
8.3 Butter
9 Extraction
9.1 Cheese
13 9.2 Butter
9.3 Milk, milk products, infant formula and adult nutritional products
9.4 Procedure
10 Instrument operating conditions
10.1 Check and maintenance of the combined silver electrode
10.2 Titration
14 10.3 Determination of very low amounts of chloride
10.4 Blank test
11 System suitability test
12 Calculations
15 13 Precision
13.1 General
13.2 Repeatability
16 13.3 Reproducibility
17 14 Test report
18 Annex A (informative) Examples of titration end point determination
20 Annex B (informative) Precision data
22 Annex C (informative) Comparison of results between sample extraction with and without additional protein precipitation
24 Bibliography

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BS ISO 21422:2018
$142.49