ISO 10378:2016
Copper, lead and zinc sulfide concentrates — Determination of gold and silver — Fire assay gravimetric and flame atomic absorption spectrometric method
ISO 10378:2016 specifies a fire assay gravimetric and flame atomic absorption spectrometric method for the determination of the mass fraction of gold and silver in copper, lead, and zinc sulfide concentrates as follows.
- Copper concentrates
The method is applicable to the determination of mass fractions of gold from 0,5 g/t to 300 g/t and of mass fractions of silver from 25 g/t to 1 500 g/t in copper sulfide concentrates containing mass fractions of copper from 15 % to 60 %.
- Lead concentrates
The method is applicable to the determination of mass fractions of gold from 0,1 g/t to 25 g/t and of mass fractions of silver from 200 g/t to 3 500 g/t in lead sulfide concentrates containing mass fractions of lead from 10 % to 80 %.
- Zinc concentrates
The method is applicable to the determination of mass fractions of gold from 0,1 g/t to 12 g/t and of mass fractions of silver from 10 g/t to 800 g/t in zinc sulfide concentrates containing mass fractions of zinc up to 60 %.
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Foreword
Introduction
1 Scope
2 Normative references
3 Principle
3.1 General
3.2 Fusion
3.3 Cupellation
3.4 Parting
3.5 Retreatment
3.6 Correction for blank contamination
4 Reagents
5 Apparatus
6 Sample
6.1 Test sample
6.2 Test portion
7 Procedure
7.1 Number of determinations
7.2 Trial fusion
7.3 Blank tests
7.4 Charge preparation
7.5 Primary fusion
7.6 Cupellation
7.7 Retreatment of residues
7.8 Determination of gold in the primary bead
7.9 Determination of gold and silver in secondary beads and blanks, and of silver in prills
7.10 Determination of silver in the parting solution
8 Expression of results
8.1 Mass fraction of gold
8.2 Mass fraction of silver
9 Precision
9.1 Expression of precision
9.2 Method for obtaining the final result (see Annex H)
9.3 Precision between laboratories
9.4 Check of trueness
9.4.1 General
9.4.2 Type of certified reference material (CRM) or reference material (RM)
10 Test report
Annex A (normative) Procedure for the preparation and determination of the mass of a predried test portion
Annex B (normative) Trial fusion
Annex C (normative) Blank determination
Annex D (normative) Inquartation
Annex E (normative) Determination of vaporization loss of silver during the cupellation process
Annex F (normative) Sulfuric acid — Parting
Annex G (normative) Determination of impurities in parting solutions and washings
Annex H (normative) Flowsheet of the procedure for the acceptance of analytical values for test samples (see 9.2)
Annex I (informative) Flowsheet of the method
Annex J (informative) Roasting method
Annex K (informative) Guide to the preparation of dilutions for the determination of silver in parting solutions and residues
Annex L (informative) Derivation of precision equations
Bibliography
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Related Information
Similar Standards
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BS ISO 10251:2006
Copper, lead, zinc and nickel concentrates. Determination of mass loss of bulk material on drying
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BS ISO 10258:2018
Copper sulfide concentrates. Determination of copper content. Titrimetric methods
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BS ISO 10378:2016
Copper, lead and zinc sulfide concentrates. Determination of gold and silver. Fire assay gravimetric and flame atomic absorption spectrometric method
-
BS ISO 10469:2006
Copper sulfide concentrates. Determination of copper. Electrogravimetric method
Foreword
Introduction
1 Scope
2 Normative references
3 Principle
3.1 General
3.2 Fusion
3.3 Cupellation
3.4 Parting
3.5 Retreatment
3.6 Correction for blank contamination
4 Reagents
5 Apparatus
6 Sample
6.1 Test sample
6.2 Test portion
7 Procedure
7.1 Number of determinations
7.2 Trial fusion
7.3 Blank tests
7.4 Charge preparation
7.5 Primary fusion
7.6 Cupellation
7.7 Retreatment of residues
7.8 Determination of gold in the primary bead
7.9 Determination of gold and silver in secondary beads and blanks, and of silver in prills
7.10 Determination of silver in the parting solution
8 Expression of results
8.1 Mass fraction of gold
8.2 Mass fraction of silver
9 Precision
9.1 Expression of precision
9.2 Method for obtaining the final result (see Annex H)
9.3 Precision between laboratories
9.4 Check of trueness
9.4.1 General
9.4.2 Type of certified reference material (CRM) or reference material (RM)
10 Test report
Annex A (normative) Procedure for the preparation and determination of the mass of a predried test portion
Annex B (normative) Trial fusion
Annex C (normative) Blank determination
Annex D (normative) Inquartation
Annex E (normative) Determination of vaporization loss of silver during the cupellation process
Annex F (normative) Sulfuric acid — Parting
Annex G (normative) Determination of impurities in parting solutions and washings
Annex H (normative) Flowsheet of the procedure for the acceptance of analytical values for test samples (see 9.2)
Annex I (informative) Flowsheet of the method
Annex J (informative) Roasting method
Annex K (informative) Guide to the preparation of dilutions for the determination of silver in parting solutions and residues
Annex L (informative) Derivation of precision equations
Bibliography