AS 2678.4-2002

1 - AS 2678.4-2002 ZINC SULFIDE CONCENTRATES-CHEMICAL ANALYSIS - DETERMINATION OF SILVER CONTENT-ACID DISSOLUTION AND F
4 - PREFACE
5 - CONTENTS
7 - 1 Scope
7 - 2 Normative references
7 - 3 Principle
8 - 4 Reagents
8 - 4.1 Silver metal
8 - 4.2 Nitric acid
8 - 4.3 Nitric acid
8 - 4.4 Hydrochloric acid
8 - 4.5 Hydrochloric acid
8 - 4.6 Ammonia solution
8 - 4.7 Ammonia solution
8 - 4.8 Silver standard solutions
8 - 4.9 Calibration solutions
9 - 5 Apparatus
9 - 5.1 Volumetric glassware
9 - 5.2 Burette
9 - 5.3 Atomic absorption spectrometer (AAS)
9 - 5.4 Balance
9 - 6 Sample
9 - 6.1 Test sample
9 - 6.2 Test portion
9 - 7 Procedure
9 - 7.1 Number of determinations
9 - 7.2 Blank test
9 - 7.3 Decomposition of test portion
10 - 7.4 Determination of silver
11 - 8 Expression of results
11 - 9 Precision
11 - 9.1 Expression of precision
11 - 9.2 Method for obtaining the final result
11 - 9.3 Precision between laboratories
12 - 9.4 Check of trueness
13 - 10 Test report
14 - Annex A Procedure for the preparation and determination of the mass of a predried test portion
14 - A.1 Scope
14 - A.2 Principle
14 - A.3 Reagents
14 - A.4 Apparatus
14 - A.5 Procedure
15 - A.6 Calculation of the test portion dry mass
16 - Annex B Flowsheet of the procedure for the acceptance of analytical values for test samples
17 - Annex C Derivation of precision equations
17 - C.1 Introduction
17 - C.2 Design of test programme
17 - C.3 Test samples
17 - C.4 Statistical evaluation

Sets out an acid dissolution AAS method for determining the silver content of zinc sulfide concentrates. This Standard is identical with and has been reproduced from ISO 15247:1999.

This International Standard specifies an acid dissolution and flame atomic absorption spectrometric method for the determination of silver content of zinc sulfide concentrates.The method is applicable to the determination of silver in zinc sulfide concentrates containing up to 60 % (m/m) zinc in the form of zinc blende and related materials.The method is applicable to silver contents from 10 g/t to 500 g/t.

First published as AS 2678.4-2002.