AS 2917.2-1994

1 - AS 2917.2-1994 COPPER SULFIDE CONCENTRATES - DETERMINATION OF GOLD AND SILVER CONTENT - FIRE ASSAY GRAVIMETRIC AND ATOMIC ABS
4 - PREFACE
7 - 1 Scope
7 - 2 Normative references
7 - 3 Principle
7 - 3.1 Fusion
7 - 3.2 Cupellation
7 - 3.3 Parting
8 - 3.4 Retreatment
8 - 3.5 Correction for blank contamination
8 - 4 Reagents
8 - 4.1 Sodium carbonate,
8 - 4.2 Litharge
8 - 4.3 Silica,
8 - 4.4 Potassiumnitrate or sodium nitrate.
8 - 4.5 Flour.
8 - 4.6 Borax,
8 - 4.7 Nitric acid,
8 - 4.8 Nitric acid,
8 - 4.9 Nitric acid,
8 - 4.10 Lead,
8 - 4.11 Silver,
8 - 4.12 Platinum,
8 - 4.13 Palladium,
8 - 4.14 Gold,
8 - 4.15 Hydrochloric acid
8 - 4.16 Mercury (II) nitrate,
8 - 4.17 Thiourea,
8 - 4.18 Aqua regia.
8 - 4.19 Blank solution.
8 - 4.20 Standard solutions.
9 - 4.21 Calibration solutions.
9 - 5 Apparatus
9 - 5.1 Assay crucible furnace,
9 - 5.2 Muffle furnace,
9 - 5.3 Crucibles,
9 - 5.4 Cupels,
9 - 5.5 Conical mould,
9 - 5.6 Analytical balance,
10 - 5.7 Microbalance,
10 - 5.8 Ordinary laboratory glassware,
10 - 5.9 Volumetric glassware,
10 - 5.10 Atomic absorption spectrometer (AAS).
10 - 5.11 Inductively coupled plasma (ICP) atomic emission spectrometer
10 - 5.12 Vibratory disc mill or swing grinding mill
10 - 5.13 Hotplate.
10 - 6 Sample
10 - 6.1 Test sample
10 - 6.2 Test portion
10 - 7 Procedure
10 - 7.1 Number of determinations
10 - 7.2 Trial fusion
10 - 7.3 Blank tests
10 - 7.4 Charge preparation
11 - 7.5 Primary fusion
11 - 7.6 Cupellation
11 - 7.7 Retreatment of residues
12 - 7.8 Determination of gold in the primary bead
13 - 7.9 Determination of gold and silver in the primary and residue beads and blanks, and of silver in parted prills
13 - 7.10 Determination of silver in the parting solution
14 - 7.11 Determination of silver and gol d in the blank flux
14 - 8 Expression of results
14 - 8.1 Gold content
14 - 8.2 Silver content
14 - 9 Precision
14 - 9.1 Expression of precision
15 - 9.2 Method for obtaining the final result
15 - 9.3 Precision between laboratories
15 - 9.4 Check of trueness
16 - 9.4.1 Type of certified reference material
16 - 10 Test report
17 - Annex A - Procedure for the preparation and determination of the mass of a predried test portion
17 - A.1 Scope
17 - A.2 Principle
17 - A.3 Chemicals
17 - A.4 Apparatus
17 - A.5 Procedure
18 - A.6 Calculation of the dry mass of the test portion
19 - Annex B - Trial fusion
19 - B.1 Introduction
19 - B.2 Procedure
20 - Annex C - Blank determination
20 - C.1 Introduction
20 - C.2 Procedure
21 - Annex D - Inquartation
21 - D.1 Introduction
21 - D.2 Procedure
22 - Annex E - Flowsheet of the procedure for the acceptance of analytical values for test samples
23 - Annex F - Roasting method
23 - F.1 Introduction
23 - F.2 Procedure
25 - Annex H - Derivation of precision equations
25 - H.1 Introduction
25 - H.2 Design of the test programme
25 - H.3 Test samples
25 - H.4 Statistical evaluation
32 - Annex J - Use of a 10 g test portion
32 - J.1 Introduction
32 - J.2 Procedure recommendation
33 - Annex K - Bibliography