AS 2917.1-1994

1 - AS 2917.1-1994 COPPER SULFIDE CONCENTRATES - DETERMINATION OF COPPER CONTENT - TITRIMETRIC METHODS
4 - PREFACE
5 - CONTENTS
7 - 1 Scope
7 - 2 Normative references
7 - 3 Principl e
7 - 3.1 Method 1 (Long iodide method)
7 - 3.2 Method 2 (Short iodide method)
7 - 4 Reagents
7 - 4.1 Copper metal,
7 - 4.2 Potassium iodide.
7 - 4.3 Ammonium hydrogen difluoride.
8 - 4.4 Sulfuric acid,
8 - 4.5 Sulfuric acid,
8 - 4.6 Nitric acid,
8 - 4.7 Nitric acid,
8 - 4.8 Hydrofluoric acid
8 - 4.9 Bromine.
8 - 4.10 Bromine water,
8 - 4.11 Hydrobromic acid
8 - 4.12 Acetic acid
8 - 4.13 Nitration mixture.
8 - 4.14 Ammonium hydrogen difluoride
8 - 4.15 Sodium carbonate
8 - 4.16 Sodium thiosulfate pentahydrate
8 - 4.17 Potassium thiocyanate
8 - 4.18 Starch,
8 - 4.19 Ethanol.
8 - 4.20 Standard solutions.
8 - 4.20.1 Sodium thiosulfate
9 - 4.20.2 Copper
9 - 5 Apparatus
9 - 5.1 Volumetric glassware,
9 - 5.2 Analytical balance,
9 - 5.3 Platinum crucibles.
9 - 5.4 Atomic absorption spectrometer (AAS),
9 - 5.5 Inductively coupled plasma (ICP) atomic emission spectrometer
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 Determination -method 1: Long iodide method
9 - 7.3.1 Decomposition of test portion
10 - 7.3.2 Separation of copper
10 - 7.3.3 Dissolution of copper precipitate
10 - 7.3.4 Titration
11 - 7.3.5 FAAS determination of copper in the insoluble residue, filtrate and filter paper
11 - 7.4 Determination -method 2: Short iodide method
11 - 7.4.1 Decomposition of the test portion
12 - 7.4.2 Titration
12 - 8 Expressi on of results
12 - 9 Precision
12 - 9.1 Expression of precision
12 - 9.2 Method for obtaining the final result
13 - 9.3 Precision between laboratories
13 - 9.4 Check of trueness
13 - 9.4.1 Type of certified reference material (CRM) or reference material (RM)
14 - 10 Test report
15 - Annex A - Procedure for the preparation and determination of the mass of a predried test portion
15 - A.1 Scope
15 - A.2 Principle
15 - A.3 Chemicals
15 - A.4 Apparatus
15 - A.5 Procedure
16 - A.6 Calculation of the dry mass of the test
17 - Annex B - Flowsheet of the procedure for the acceptance of analytical values for test samples
18 - Annex C - Derivation of precision equations
18 - C.1 Introduction
18 - C.2 Design of the test programme
18 - C.3 Test samples
18 - C.4 Statistical evaluation