ISO 10258-2018 PDF

Full title and description

ISO 10258:2018 — Copper sulfide concentrates — Determination of copper content — Titrimetric methods. This International Standard specifies two titrimetric procedures (a long iodide method with prior separation of copper, and a short iodide method without separation) for determining the copper content of copper sulfide concentrates in the range approximately 15 % (m/m) to 50 % (m/m), using sodium thiosulfate titration and starch as an indicator.

Abstract

ISO 10258:2018 describes sample decomposition and preparation, reagents and apparatus, two iodometric titration procedures (Method 1: separation of copper as a sulfide prior to titration; Method 2: direct titration after acid decomposition and removal of interfering elements), interference-control steps (e.g. use of ammonium hydrogen difluoride to remove iron interference, hydrobromic acid treatment to remove As/Sb/Sn where applicable) and the calculation of copper content from titration results. The procedures are intended for routine laboratory analysis of copper sulfide concentrates.

General information

• Status: Published (confirmed as current on review).
• Publication date: February 2018 (third edition, 2018-02; published in February 2018).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 73.060.99 (other metalliferous minerals).
• Edition / version: 3rd edition (2018).
• Number of pages: 20 (official ISO edition page count).

(General bibliographic and status details as listed by ISO.)

Scope

This document applies to the determination of copper content in copper sulfide concentrates by titrimetric (iodometric) methods. It gives detailed procedures for sample preparation, separation (where applicable), reagents, titration steps, interference control, calculation of results and reporting. The methods are suitable for concentrates with copper contents in the approximate range 15 % to 50 % (m/m) and are intended for laboratory quality-control and assay purposes.

Key topics and requirements

• Two titrimetric procedures: Method 1 (long iodide method with prior separation) and Method 2 (short iodide method without separation).
• Scope of applicability: copper content range approximately 15 % to 50 % (m/m).
• Detailed sample decomposition and preparation steps for sulphide concentrates.
• Reagents required (e.g., potassium iodide, sodium thiosulfate, ammonium hydrogen difluoride, acids) and reagent purity requirements.
• Apparatus and glassware specifications for accurate volumetric titration.
• Interference-control measures (precipitation/separation steps; removal of As/Sb/Sn; elimination of iron interference) and recommended corrective steps.
• Calculation formulae to convert titration volumes to mass-percent copper and instructions for reporting results.
• Precision and quality-control recommendations (use of blanks, standardization of titrant, duplicate determinations).
• Safety and handling notes for hazardous reagents and acid digestion steps.

Typical use and users

This standard is used by metallurgical and mineral assay laboratories, mining company laboratory personnel, concentrate producers, third-party assayers, research laboratories working on copper ores/concentrates and quality-control teams monitoring concentrate composition for sale/processing. It is used for routine assay work, production control, contract verification and laboratory method standardization.

Related standards

ISO 10258:2018 replaces the previous edition ISO 10258:2015. It is part of the body of ISO and national standards covering mineral concentrate sampling and analysis and is developed under ISO/TC 183 (work on ores and concentrates). Users often apply ISO 10258 alongside national or industry standards on sampling, sample preparation and chemistry of metallurgical materials.

Keywords

Copper sulfide concentrates; copper assay; titrimetry; iodometric titration; sodium thiosulfate; sample decomposition; interference control; ammonium hydrogen difluoride; assay methods; metallurgical laboratory standard.

FAQ

Q: What is this standard?

A: ISO 10258:2018 is an International Standard that specifies titrimetric (iodometric) methods for determining the copper content of copper sulfide concentrates.

Q: What does it cover?

A: It covers two laboratory titration procedures (one with prior separation of copper and one without), required reagents and apparatus, sample preparation and decomposition, interference-removal steps, calculation of results, precision and reporting.

Q: Who typically uses it?

A: Assay and metallurgical laboratories, mining-company QC labs, concentrate producers, third-party assayers and researchers who need standardized, reproducible methods to determine copper content in sulphide concentrates.

Q: Is it current or superseded?

A: It is the current (third) edition published in February 2018 and was confirmed as the current ISO edition on review (ISO review confirmed in 2023). It replaced ISO 10258:2015.

Q: Is it part of a series?

A: It is not a numbered multipart series itself, but it is part of ISO's collection of standards for analysis of ores and concentrates developed under ISO/TC 183 and is related to other ISO and national standards on sampling, sample preparation and analytical chemistry for metalliferous minerals.

Q: What are the key keywords?

A: Copper, sulphide concentrates, titrimetry, iodometric titration, sodium thiosulfate, assay, laboratory method, interference removal.