ISO 5068-2:2025

International
Standard
ISO 5068-2
Second edition
Brown coals and lignites —
2025-05
Determination of moisture —
Part 2:
Indirect gravimetric method for
moisture in the analysis sample
Charbons bruns et lignites — Détermination de l'humidité —
Partie 2: Méthode gravimétrique indirecte pour l'humidité de
l'échantillon d'analyse
Reference number
© ISO 2025
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ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagent . 1
6 Apparatus . 2
7 Sample . 4
8 Procedure . 4
9 Expression of results . 4
10 Repeatability limit . 5
11 Test report . 5
Annex A (informative) Nitrogen-purification train . 6

iii
Foreword
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This document was prepared by Technical Committee ISO/TC 27, Coal and coke, Subcommittee SC 5, Methods
of analysis.
This second edition cancels and replaces the first edition (ISO 5068-2:2007), which has been technically
revised.
The main changes are as follows:
— referenced documents have been updated;
— terms and definitions have been updated;
— the test report has been updated.
A list of all parts in the ISO 5068 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

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International Standard ISO 5068-2:2025(en)
Brown coals and lignites — Determination of moisture —
Part 2:
Indirect gravimetric method for moisture in the analysis sample
1 Scope
This document specifies a method for the determination of the moisture in the analysis sample of brown
coals and lignites using an indirect gravimetric method.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 1213-2, Coal and coke — Vocabulary — Part 2: Terms relating to sampling, testing and analysis
ISO 13909-4, Coal and coke — Mechanical sampling — Part 4: Preparation of test samples of coal
ISO 18283, Coal and coke — Manual sampling
3 Terms and definitions
For the purpose of this document, the terms and definitions given in ISO 1213-2 apply.
ISO and IEC maintain
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