ISO 21826-1:2022
Iron ores — Determination of total iron content using the EDTA photometric titration method — Part 1: Microwave digestion method
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.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Sampling and samples
7.1 Laboratory sample
7.2 Preparation of test samples
7.2.1 General
7.2.2 Ores having significant contents of combined water or oxidizable compounds
7.2.3 Ores outside the scope of 7.2.2
8 Procedures
8.1 Number of determinations
8.2 Test portion
8.3 Blank test
8.4 Determination
8.4.1 Decomposition of the test portion
8.4.2 Titration
8.5 Procedure of blank test
9 Expression of results
9.1 Calculation of total iron content
9.2 General treatment of results
9.2.1 Repeatability and permissible tolerance
9.2.2 Methods for checking the acceptability of the test results and determining the final quoted result
9.2.3 Between-laboratories precision
9.2.4 Check for trueness
9.2.5 Calculation of final result
9.3 Oxide factors
10 Test report
Annex A (informative) Flowsheet of the procedure for the acceptance of analytical values for test samples
Annex B (informative) Typical titration curves
Annex C (informative) Titration parameters for reference
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Sampling and samples
7.1 Laboratory sample
7.2 Preparation of test samples
7.2.1 General
7.2.2 Ores having significant contents of combined water or oxidizable compounds
7.2.3 Ores outside the scope of 7.2.2
8 Procedures
8.1 Number of determinations
8.2 Test portion
8.3 Blank test
8.4 Determination
8.4.1 Decomposition of the test portion
8.4.2 Titration
8.5 Procedure of blank test
9 Expression of results
9.1 Calculation of total iron content
9.2 General treatment of results
9.2.1 Repeatability and permissible tolerance
9.2.2 Methods for checking the acceptability of the test results and determining the final quoted result
9.2.3 Between-laboratories precision
9.2.4 Check for trueness
9.2.5 Calculation of final result
9.3 Oxide factors
10 Test report
Annex A (informative) Flowsheet of the procedure for the acceptance of analytical values for test samples
Annex B (informative) Typical titration curves
Annex C (informative) Titration parameters for reference
Bibliography