Foreword

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This document was prepared by Technical Committee ISO/TC 183, Copper, lead, zinc and nickel ores and concentrates.

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1 Scope

This document specifies an acid digestion and flame atomic absorption spectrometric (AAS) method, or inductively coupled plasma optical emission spectrometric (ICP-OES) method for the determination of the mass fraction of silver in copper and zinc sulfide concentrates.

The method is applicable to concentrates having silver contents in the following ranges.

copper concentrates: 10 g/t to 800 g/t ;
zinc concentrates: 10 g/t to 800 g/t

2 Normative references

3 Terms and definitions

4 Principle

5 Reagents

5.1 Solids

5.2 Acids

5.3 Standard solutions

6 Apparatus

6.1

6.2

6.3

6.4

6.5

6.6

6.7

7 Instrument operating parameters

7.1 Analytical parameters

7.2 Flame of AAS

7.3 Measurement wavelength

7.4 Background correction mechanism

8 Sample and sample preparation

8.1 Laboratory sample

8.2 Test sample

9 Procedure

9.1 Number of determinations

9.2 Test portion

9.3 Blank test

9.4 Dissolution of the test portion

9.5 Dissolution of the insoluble residue

9.6 Preparation of test solutions

9.7 Preparation of the calibration solutions

9.8 Preparation of silver calibration curve

9.9 Determination of silver content in test solutions

10 Calculations

11 Procedure for obtaining the final result

12 Test report

13 Precision and accuracy

13.1 Expression of precision

13.2 Procedure for obtaining the final result

13.3 Interlaboratory precision

13.4 Check of trueness

Bibliography