AS 4868.1-2008

1 - AS 4868.1-2008 Copper, lead and zinc sulfide concentrates-Chemical analysis - Part 1: Determination of gold and silver-Fibre assay gravimetric and flame atomic absorption spectrometric method
4 - PREFACE
5 - CONTENTS
7 - INTRODUCTION
9 - 1 Scope
9 - 2 Normative references
10 - 3 Principle
10 - 4 Reagents
12 - 5 Apparatus
13 - 6 Sample
13 - 6.1 Test sample
13 - 6.2 Test portion
13 - 7 Procedure
13 - 7.1 Number of determinations
13 - 7.2 Trial fusion
13 - 7.3 Blank tests
14 - 7.4 Charge preparation
15 - 7.5 Primary fusion
15 - 7.6 Cupellation
16 - 7.7 Retreatment of residues
16 - 7.8 Determination of gold in the primary bead
17 - 7.9 Determination of gold and silver in secondary beads and blanks, and of silver in prills
19 - 7.10 Determination of silver in the parting solution
19 - 8 Expression of results
19 - 8.1 Mass fraction of gold
20 - 8.2 Mass fraction of silver
21 - 9 Precision
21 - 9.1 Expression of precision
22 - 9.2 Method for obtaining the final result (see Annex H)
23 - 9.3 Precision between laboratories
25 - 9.4 Check of trueness
26 - 10 Test report
27 - Annex A (normative) Procedure for the preparation and determination of the mass of a predried test portion
29 - Annex B (normative) Trial fusion
30 - Annex C (normative) Blank determination
31 - Annex D (normative) Inquartation
32 - Annex E (normative) Determination of vaporization loss of silver during the cupellation process
33 - Annex F (normative) Sulfuric acid - Parting
35 - Annex G (normative) Determination of impurities in parting solutions and washings
39 - Annex H (normative) Flowsheet of the procedure for the acceptance of analytical values for test samples (see 9.2)
40 - Annex I (informative) Flowsheet of the method
41 - Annex J (informative) Roasting method
42 - Annex K (informative) Guide to the preparation of dilutions for the determination of silver in parting solutions and residues
43 - Annex L (informative) Derivation of precision equations
60 - Bibliography

Adopts ISO10378:2005 to provide a method for determining gold and silver in copper, lead and zinc sulphide concentrates.

Originated in part as AS 2917-1986, AS 2678.5-2002 and AS 4030.3-2002.
AS 2917.2-1994, AS 2678.5-2002 and AS 4030.3-2002 revised, amalgamated and redesignated as AS 4868.1-2008.