ISO 11456:2025
(Main)Copper and zinc sulfide concentrates — Determination of silver content — Acid digestion and flame atomic absorption spectrometric or inductively coupled plasma optical emission spectrometric method
Copper and zinc sulfide concentrates — Determination of silver content — Acid digestion and flame atomic absorption spectrometric or inductively coupled plasma optical emission spectrometric method
This document specifies an acid digestion and flame atomic absorption spectrometric (AAS) method, or inductively coupled plasma optical emission spectrometric (ICP-OES) method for the determination of the mass fraction of silver in copper and zinc sulfide concentrates. The method is applicable to concentrates having silver contents in the following ranges. — copper concentrates: 10 g/t to 800 g/t ; — zinc concentrates: 10 g/t to 800 g/t
Concentrés sulfurés de cuivre et de zinc — Dosage de l'argent — Méthode par digestion acide et spectrométrie d'absorption atomique dans la flamme ou spectroscopie d’émission optique par plasma à couplage inductif
General Information
Standards Content (Sample)
International
Standard
ISO 11456
First edition
Copper and zinc sulfide
2025-10
concentrates — Determination of
silver content — Acid digestion
and flame atomic absorption
spectrometric or inductively
coupled plasma optical emission
spectrometric method
Concentrés sulfurés de cuivre et de zinc — Dosage de l'argent
— Méthode par digestion acide et spectrométrie d'absorption
atomique dans la flamme ou spectroscopie d’émission optique
par plasma à couplage inductif
Reference number
© ISO 2025
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Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Reagents . 2
5.1 Solids .2
5.2 Acids .2
5.3 Standard solutions .3
6 Apparatus . 4
7 Instrument operating parameters . 4
7.1 Analytical parameters .4
7.2 Flame of AAS .4
7.3 Measurement wavelength .4
7.4 Background correction mechanism .5
8 Sample and sample preparation . 5
8.1 Laboratory sample .5
8.2 Test sample .5
9 Procedure . 5
9.1 Number of determinations .5
9.2 Test portion .5
9.3 Blank test .5
9.4 Dissolution of the test portion .5
9.4.1 General .5
9.4.2 Dissolution of the test portion with nitric acid and hydrochloric acid .6
9.4.3 Alternative dissolution of the test portion .6
9.5 Dissolution of the insoluble residue .6
9.6 Preparation of test solutions . .7
9.6.1 General .7
9.6.2 Atomic absorption spectrometer (AAS) .7
9.6.3 Inductively coupled plasma optical emission spectrometer (ICP-OES) .7
9.7 Preparation of the calibration solutions .7
9.7.1 General .7
9.7.2 Atomic absorption spectrometer (AAS) .7
9.7.3 Inductively coupled plasma optical emission spectrometer (ICP-OES) .8
9.8 Preparation of silver calibration curve .9
9.8.1 General .9
9.8.2 Atomic absorption spectrometer (AAS) .9
9.8.3 Inductively coupled plasma optical emission spectrometer (ICP-OES) .9
9.9 Determination of silver content in test solutions .9
9.9.1 General .9
9.9.2 Atomic absorption spectrometer (AAS) .9
9.9.3 Inductively coupled plasma optical emission spectrometer (ICP-OES) .10
10 Calculations .10
11 Procedure for obtaining the final result . 10
12 Test report . 10
13 Precision and accuracy .11
13.1 Expression of precision .11
13.2 Procedure for obtaining the final result .11
13.3 Interlaboratory precision .11
iii
13.4 Check of trueness . 12
13.4.1 General . 12
13.4.2 Type of certified reference material or reference material . 13
Annex A (normative) Procedure for obtaining the final results . 14
Annex B (informative) Procedure for the preparation and determination of the mass of a
predried test portion .15
Annex C (informative) Precision experiment and trueness test . 17
Bibliography .40
iv
Foreword
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