This Standard sets out gravimetric procedures for the determination of gold content in the range 0.2 % to 30 % in gold and gold bearing alloys with < 2 % nickel, < 0.05 % rhodium, < 0.05 % tungsten, < 0.05 % tin, < 1 % platinum and < 3 % palladium.
Table of contents
Header
About this publication
Preface
1 Scope and general
1.1 Scope
1.2 Normative references
1.3 Definitions
1.4 Reagents
1.5 Apparatus
2 Sample preparation and preliminary determination
2.1 General
2.2 Sample inspection and preparation
2.3 Preliminary determination of the approximate total precious metals, gold, silver and total base metals content
2.3.1 General
2.3.2 Test portion preparation
2.3.3 Cupellation
2.3.4 Re-inquarting
2.3.5 Parting
2.3.6 Calculations
2.4 Criteria for selection of determination method
3 Total precious metals content less than 40 %
3.1 Scope of section
3.2 Principle
3.3 Number of determinations
3.4 Proof tests
3.5 Preparation of test portion and proof
3.6 Cupellation
3.7 Parting
3.8 Calculations
3.8.1 Change in mass of proof
3.8.2 Determination of surcharge
3.8.3 Adjusted mass of the gold cornet from the sample or test portion
3.8.4 Gold content
4 Total precious metals content is 40 % or greater
