Iron ores — Determination of hygroscopic moisture in analytical samples — Gravimetric, Karl Fischer and mass-loss methods

ISO 2496:2006 specifies the following four test methods for the determination of the hygroscopic moisture content of test samples: Method 1 -- Gravimetric method; Method 2 -- Karl Fischer volumetric method; Method 3 -- Karl Fischer coulometric method; Method 4 -- Mass-loss method. Any of these methods is applicable wherever the analytical value of a chemical constituent is to be calculated to a dried sample basis in the following ore types. Processed ores containing metallic iron (direct reduced iron). Natural or processed ores in which the sulfur content is greater than 0,2 % (mass fraction). Natural or processed ores in which the combined water is greater than 2,5 % (mass fraction). Any of these methods is applicable to a concentration range of 0,05 % (mass fraction) to 4,5 % (mass fraction) hygroscopic moisture.

Minerais de fer — Détermination de l'humidité hygroscopique dans les échantillons pour analyse — Méthodes gravimétrique, selon Karl Fischer et par perte de masse

General Information

Status
Published
Publication Date
09-May-2006
Current Stage
9093 - International Standard confirmed
Due Date
03-Mar-2025
Completion Date
03-Mar-2025
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ISO 2596:2006 - Iron ores -- Determination of hygroscopic moisture in analytical samples -- Gravimetric, Karl Fischer and mass-loss methods
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INTERNATIONAL ISO
STANDARD 2596
Fifth edition
2006-05-01
Iron ores — Determination of
hygroscopic moisture in analytical
samples — Gravimetric, Karl Fischer and
mass-loss methods
Minerais de fer — Détermination de l'humidité hygroscopique dans les
échantillons pour analyse — Méthodes gravimétrique, selon Karl
Fischer et par perte de masse
Reference number
©
ISO 2006
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ii © ISO 2006 – All rights reserved

Contents Page
Foreword. v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Method 1 — Gravimetric method . 2
3.1 Principle. 2
3.2 Reagents. 2
3.3 Apparatus . 3
3.4 Sampling and samples. 4
3.4.1 Laboratory sample. 4
3.4.2 Preparation of test sample. 4
3.5 Procedure . 4
3.5.1 Apparatus conditioning. 4
3.5.2 System checks . 5
3.5.3 Blank test. 5
3.5.4 Check test. 5
3.5.5 Determination. 6
3.6 Expression of results . 6
3.6.1 Calculation of hygroscopic moisture content . 6
3.6.2 Hygroscopic moisture correction of analytical test portion mass . 7
4 Method 2 — Karl Fischer volumetric method . 7
4.1 Principle. 7
4.2 Reagents. 7
4.3 Apparatus . 8
4.4 Sampling and samples. 9
4.4.1 Laboratory sample. 9
4.4.2 Preparation of test sample. 10
4.5 Procedure . 10
4.5.1 Conditioning of drying tube. 10
4.5.2 Preparation of titration unit . 10
4.5.3 Titration. 10
4.5.4 Blank test. 11
4.5.5 Check test. 11
4.5.6 Determination. 11
4.6 Expression of results . 12
4.6.1 Calculation of hygroscopic moisture content . 12
4.6.2 Hygroscopic moisture correction of analytical test portion mass . 12
5 Method 3 — Karl Fischer coulometric method . 13
5.1 Principle. 13
5.2 Reagents. 13
5.3 Apparatus . 14
5.4 Sampling and samples. 15
5.4.1 Laboratory sample. 15
5.4.2 Preparation of test sample. 15
5.5 Procedure . 15
5.5.1 Preparation of titration unit . 15
5.5.2 Conditioning of drying tube. 15
5.5.3 Blank test. 16
5.5.4 Check test. 16
5.5.5 Determination . 17
5.6 Expression of results. 17
5.6.1 Calculation of hygroscopic moisture content. 17
5.6.2 Hygroscopic moisture correction of analytical test-portion mass . 18
6 Method 4 — Mass-loss method . 18
6.1 Principle . 18
6.2 Reagents . 18
6.3 Apparatus. 19
6.4 Sampling and samples . 20
6.4.1 Laboratory sample . 20
6.4.2 Preparation of test sample. 20
6.5 Procedure. 20
6.5.1 Apparatus conditioning. 20
6.5.2 Check test . 21
6.5.3 Determination . 21
6.6 Expression of results. 22
6.6.1 Calculation of hygroscopic moisture content. 22
6.6.2 Hygroscopic moisture correction of analytical test portion mass . 22
Annex A (informative) Gravimetric and Karl Fischer apparatus. 23
Annex B (informative) Drying tube. 24
Annex C (informative) Titanium absorption tube . 26
Annex D (informative) Volumetric titration cell . 27
Annex E (informative) Coulometric titration cell . 28
Annex F (informative) Modified weighing chamber apparatus . 29
Annex G (informative) Modified weighing chamber. 30
Annex H (informative) Parcher equipment. 31
Bibliography . 32

iv © ISO 2006 – All rights reserved

Foreword
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