Adopts ISO 10258:2015 to specify two titrimetric methods for the determination of the copper content of copper sulfide concentrates in the range 15 % (m/m) to 50 % (m/m), using sodium thiosulfate after separation (method 1) or without separation (method 2) of copper from interfering elements.
Table of contents
Header
About this publication
Preface
1 Scope
2 Normative references
3 Principle
3.1 Method 1 (Long iodide method)
3.2 Method 2 (Short iodide method)
4 Reagents
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
4.10
4.11
4.12
4.13
4.14
4.15
4.16
4.17
4.18
4.19
4.20
4.20.1
4.20.1.1
4.20.1.2
4.20.2
5 Apparatus
5.1
5.2
5.3
5.4
5.5
6 Sample
6.1 Test sample
6.2 Test portion
7 Procedure
7.1 Number of determinations
7.2 Blank test
7.3 Determination — method 1: Long iodide method
7.3.1 Decomposition of test portion
7.3.2 Separation of copper
7.3.3 Dissolution of copper precipitate
7.3.4 Titration
7.3.5 FAAS determination of copper in the insoluble residue, filtrate, and filter paper
7.3.5.1 Decomposition of the insoluble residue
7.3.5.2 Decomposition of the precipitate remaining on the filter paper
7.3.5.3 Spectrometric measurement
7.4 Determination — method 2: Short iodide method
7.4.1 Decomposition of the test portion
7.4.2 Titration
8 Expression of results
9 Precision
9.1 Expression of precision
9.2 Method for obtaining the final result (see Annex B)
9.3 Precision between laboratories
9.4 Check of trueness
10 Test report
Annex A
A.1 General
A.2 Principle
A.3 Reagent
A.3.1 Desiccant, such as self-indicating silica gel or anhydrous magnesium perchlorate.
A.4 Apparatus
A.4.1
A.4.2
A.4.3
A.5 Procedure
A.5.1 Preparation of the weighing vessel
A.5.2 Test portion
A.5.3 Determination of the test-portion dry mass
A.6 Calculation of the dry mass of the test portion
