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AS ISO 15248:2015
$119.21
Zinc sulfide concentrates – Determination of silver and gold contents – Fire assay and flame atomic absorption spectrometric method using scorification or cupellation
Adopts ISO15248:1998 to provide those involved in the analysis of zinc sulfide concentrates with a standardized method of determining silver and gold contents supported by precision data obtained from an inter-laboratory test programme.
Table of contents
Header
About this publication
Preface
1 Scope
2 Normative references
3 Principle
3.1 Scorification
3.2 Cupellation
4 Reagents
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8 Nitric acid, (250 ml/l)
4.9
4.10
4.11
4.12
4.13
4.14
4.15
4.15.1
4.15.1.1
4.15.1.2
4.15.2
4.15.2.1
4.15.2.2
4.16 Calibration solutions
4.16.1 Silver calibration solutions
4.16.2
5 Apparatus
5.1
5.2
5.2.1
5.2.2
5.2.3
5.2.4
5.2.5
5.2.6 Conical mould, made of cast iron, of sufficient capacity to contain all of the molten lead plus slag from the crucible fusion.
5.2.7
5.3 Balances
5.3.1
5.3.2
5.4
5.5
5.5.1
5.5.2
5.5.3
5.6
6 Sample
6.1 Test sample
6.2 Test portion
7 Procedure
7.1 Number of determinations
7.2 Trial fusion
7.3 Blank tests
7.4 Charge preparation
7.5 Primary fusion
7.6 Selection of recovery procedure
7.7 Scorification
7.7.1 General
7.7.2 Retreatment fusion
7.7.3 Scorification
7.8 Cupellation
7.8.1 General
7.8.2 Retreatment fusion
7.8.3 Cupellation
7.9 Treatment of the lead buttons or silver/gold beads
7.10 Determination of silver in the test solution by flame atomic absorption spectrometry
7.11 Determination of gold in the test solution by flame atomic absorption spectrometry
