ISO 21826-1:2022 PDF

Name: ISO 21826-1:2022 — Iron ores — Determination of total iron content using the EDTA photometric titration method — Part 1: Microwave digestion method
SKU: ISO 21826-1:2022
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Iron ores — Determination of total iron content using the EDTA photometric titration method — Part 1: Microwave digestion method

Название (английский):

ISO 21826-1:2022

Iron ores — Determination of total iron content using the EDTA photometric titration method — Part 1: Microwave digestion method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 26
Дата публикации:: 21 июля 2022 г.
Издание:: ISO IS 21826 edition 1 version 1
ICS:: 73.060.10

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Описание (английский):

This document specifies a photometric titration method using EDTA for the determination of the total iron content of iron ores. This method is applicable to a concentration range of a mass fraction of 37,00 % to 72,00 % of total iron in natural iron ores, iron ore concentrates and agglomerates, including sinter products. This method does not apply as a referee method.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 21826-1:2022 specifies a laboratory method for determining the total iron content in iron ores using an EDTA photometric titration after microwave digestion. The procedure applies to natural iron ores, iron ore concentrates and agglomerates (including sinter) with a total iron mass fraction from 37.00 % to 72.00 %. The standard covers sample digestion, reagent preparation, EDTA standardization, automatic photometric titration and calculation/reporting of results. Note: this method is not intended as a referee (official arbitration) method.

Keywords: ISO 21826-1:2022, iron ores, EDTA photometric titration, microwave digestion, total iron content, iron ore analysis

Key topics and technical requirements

Scope and applicability: Valid for Fe mass fractions 37.00–72.00 % in ores, concentrates and agglomerates; excludes use as a referee method.

Principle: Closed-vessel microwave digestion in a mixture of nitric acid, hydrochloric acid and hydrofluoric acid; dilution and pH adjustment to pH 1; sulphuric acid added to prevent titanium hydroxide precipitation; boric acid to mitigate fluoride interference; automatic photometric titration with disodium EDTA.

Reagents and solutions: Analytical-grade acids (HCl, HNO3, HF), sulphuric and boric acid solutions, sodium hydroxide, iron standard solution and 0.10 mol·L−1 EDTA (with procedures for preparation and standardization).

Apparatus and conditions: Closed microwave digestion vessels, photometric sensor and titration apparatus, pH electrode and controlled titration temperature (solution >50 °C at titration end); references to ISO glassware standards (ISO 385, 648, 1042).

Quality control: Procedures for EDTA standardization and blank tests, multiple determinations, calculation of total iron content, repeatability, between-laboratory precision and trueness checks. Informative annexes provide flowsheets, typical titration curves and reference titration parameters.

Safety: The document warns of hazardous materials (notably HF) and requires appropriate health and safety practices.

Applications and who uses it

Mining and mineral processing laboratories for routine determination of total Fe in ores, concentrates and sinter products.

Quality control and production monitoring in pelletizing/agglomeration plants to verify feed and product Fe content.

Analytical chemists and metallurgists implementing validated EDTA titration workflows after microwave digestion.

Contract testing laboratories and in-house QC labs that require a standardized photometric titration method for medium–high Fe concentrations (37–72 %).

Practical benefits include repeatable, automated endpoint detection and compatibility with closed-vessel microwave digestion for efficient sample decomposition.

Related standards

ISO 3082 - Sampling and sample preparation procedures for iron ores

ISO 7764 - Preparation of predried test samples for chemical analysis

ISO glassware standards referenced: ISO 385, ISO 648, ISO 1042

Use ISO 21826-1:2022 when you need a standardized, validated EDTA photometric titration workflow for medium-to-high Fe iron ores and related materials, while observing all safety and laboratory quality-control requirements.

ISO 21826-1:2022 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and who uses it

Related standards

Технические детали

BS EN ISO 385:2005

Laboratory glassware. Burettes.

BS ISO 3082:2017

Iron ores. Sampling and sample preparation procedures.

ISO 7764:1985

Iron ores — Preparation of predried test samples for chemical analysis

ISO 6487:2015/Amd 1:2017

Road vehicles — Measurement techniques in impact tests — Instrumentation — Amendment 1

BS EN ISO 10427-1:2024

Oil and gas industries including lower carbon energy. Equipment for well cementing. Casing bow-spring central…