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eLibrary > BS ISO 5724:2023 Jewellery and precious metals. Determination of very high purity gold. Difference method using ICP-MS >

BS ISO 5724:2023 Jewellery and precious metals. Determination of very high purity gold. Difference method using ICP-MS, 2023

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BS ISO 5724:2023 Jewellery and precious metals. Determination of very high purity gold. Difference method using ICP-MS, 2023

National foreword
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents [Go to Page]
5.10 Monoelemental standard stock solutions (1 mg/ml).
5.11 Gold standard stock solution (20 g/l).
5.12 Stock solutions and standard solutions. [Go to Page]
5.12.1 Concentrated stock solution (10 µg/ml).
5.12.2 Stock solution (0,1 µg/ml).
5.12.3 Concentrated internal standard solution (10 µg/ml).
5.12.4 Internal standard solution (0,1 µg/ml).
6 Apparatus [Go to Page]
6.1 Customary laboratory apparatus
7 Sampling
8 Procedure [Go to Page]
8.1 General
8.2 Sample preparation
8.3 Sample solution
8.4 Blank solution
8.5 Calibration solutions [Go to Page]
8.5.1 Blank calibration solutions
8.5.2 Sample calibration solutions
8.6 Measurement
9 Calculation and expression of the results [Go to Page]
9.1 Calibration curves
9.2 Calculation
9.3 Repeatability
10 Test report
Annex A (informative) Procedures for preparation of monoelemental standard stock solutions
Annex B (informative) Measurement parameters [Go to Page]

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