ISO 10213-1991 PDF

Full title and description

ISO 10213:1991 — Aluminium ores — Determination of total iron content — Titanium trichloride reduction method. International Standard describing a mercury‑free titrimetric laboratory procedure for measuring total iron in aluminium ores (bauxite) by reduction of Fe(III) with tin(II) chloride and titanium(III) chloride and titration with potassium dichromate; available as an 8‑page PDF (first edition, 1991).

Abstract

This standard specifies a laboratory titrimetric method, free from mercury pollution, for determination of the total iron content in aluminium ores. The procedure uses reduction of trivalent iron with tin(II) chloride followed by titanium(III) chloride to reduce remaining iron, oxidation of excess reductant with perchloric acid, and titration of the reduced iron with potassium dichromate using sodium diphenylaminesulfonate as indicator. It is applicable to ores containing approximately 2 % to 50 % (m/m) Fe2O3.

General information

• Status: Withdrawn (withdrawal completed in 2016).
• Publication date: December 1991 (Edition 1, 1991‑12; publication records list mid‑December 1991).
• Publisher: International Organization for Standardization (ISO), Geneva.
• ICS / categories: 73.060.40 — Aluminium ores.
• Edition / version: First edition — ISO 10213:1991 (E).
• Number of pages: 8 pages.

Scope

Applies to the determination of total iron content in aluminium ores (bauxite and related materials) in the approximate range 2 % to 50 % Fe2O3. The method covers sample decomposition (sintering with sodium peroxide and fusion), dissolution, sequential chemical reduction of iron species (Sn(II) and Ti(III)), removal/oxidation of excess reductant, and titration with a standard potassium dichromate solution using a specified indicator. The standard references normative procedures for sample preparation and precision assessment.

Key topics and requirements

• Scope and applicable concentration range: suitable for ores with ~2–50 % Fe2O3.
• Sample preparation: drying, sintering/fusion and dissolution procedures for representative test portions.
• Reagents and apparatus: analytical‑grade reagents (hydrochloric, perchloric, sulfuric acids; SnCl2 and TiCl3 solutions; potassium dichromate titrant; sodium diphenylaminesulfonate indicator) and basic volumetric laboratory glassware and furnaces.
• Reduction sequence: major portion of Fe(III) reduced with Sn(II) chloride, remainder reduced with Ti(III) chloride; careful control of reduction to avoid complete reduction or over‑reduction.
• Titration procedure: oxidation of excess reductant, titration of reduced iron with potassium dichromate, blank and check tests, duplicate determinations for repeatability.
• Quality and precision: use of certified reference materials and adherence to repeatability/reproducibility practices (referenced precision standards).
• Normative references: related ISO methods for sample prep and precision are referenced (e.g., ISO standards on sample preparation and precision of test methods).

Typical use and users

Used by analytical and metallurgical laboratories performing routine or investigative analysis of bauxite and other aluminium ore materials. Typical users include mining companies, ore processors, quality control laboratories, research institutions, assay labs, and national standards bodies that maintain or compare analytical procedures for iron content in ores.

Related standards

Standards and documents commonly associated with or referenced by ISO 10213:1991 include the ISO sample‑preparation standards for aluminium ores, ISO precision and reproducibility guidance for test methods, and later/revised publications of the same method (national adoptions or later ISO revisions such as an ISO 10213 edition published around 2000). National and regional standards for iron determination in ores may also reference or adapt this method.

Keywords

aluminium ores, bauxite, total iron, Fe2O3, iron determination, titanium trichloride, tin(II) chloride, potassium dichromate, titrimetry, analytical method, sample preparation, ISO 10213:1991

FAQ

Q: What is this standard?

A: ISO 10213:1991 is an International Standard that specifies a titrimetric (volumetric) laboratory method for determining the total iron content in aluminium ores using a titanium trichloride / tin(II) chloride reduction sequence and potassium dichromate titration.

Q: What does it cover?

A: It covers sample decomposition and preparation, required reagents and apparatus, sequential chemical reduction of iron species, oxidation/removal of excess reductant, titration steps, blank and check procedures, and guidance on repeatability; applicable to ores with about 2 %–50 % Fe2O3.

Q: Who typically uses it?

A: Mining and processing companies, metallurgical and assay laboratories, quality control and research laboratories that analyse bauxite and other aluminium ores for iron content.

Q: Is it current or superseded?

A: ISO 10213:1991 is withdrawn (the ISO lifecycle shows the 1991 edition as withdrawn; revisions and later national/adopted editions exist — consult the national standards body or ISO catalogue for the most current method or any replacement publication).

Q: Is it part of a series?

A: It belongs to ISO work on aluminium ores and their methods of analysis (ISO/TC 79 technical committee activities). Related ISO standards cover sample preparation, precision of test methods and other analytical methods for ores; there are later national adoptions and a later edition of ISO 10213 recorded in standards catalogs.

Q: What are the key keywords?

A: Aluminium ores, bauxite, total iron, Fe2O3, titrimetry, titanium trichloride, tin(II) chloride, potassium dichromate, analytical chemistry.