ISO 5071-1:2021

INTERNATIONAL ISO
STANDARD 5071-1
Third edition
2021-12
Brown coals and lignites —
Determination of the volatile matter
in the analysis sample —
Part 1:
Two-furnace method
Charbons bruns et lignites — Détermination des matières volatiles
dans l'échantillon pour analyse —
Partie 1: Méthode avec utilisation de deux fours
Reference number
ISO 5071-1:2021(E)
© ISO 2021

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ISO 5071-1:2021(E)
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ISO 5071-1:2021(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 1
6 Apparatus . 2
7 Sample . 6
8 Procedure .6
8.1 Preliminary procedure . 6
8.2 Predetermination procedure. 6
8.3 Method using oven-dried coal . 6
8.4 Method using air-dried coal . 6
9 Calculation and expression of results . 7
9.1 For oven-dried coal . 7
9.2 For air-dried coal . 7
10 Precision . 8
10.1 Repeatability limit . 8
10.2 Reproducibility limit . 8
11 Test report . 8
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ISO 5071-1:2021(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
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This document was prepared by Technical Committee ISO/TC 27, Coal and coke, Subcommittee SC 5,
Methods of analysis.
This third edition cancels and replaces the second edition (ISO 5071-1:2013), of which it constitutes a
minor revision. The changes compared to the previous edition are as follows:
— referenced documents have been updated;
— terms and definitions have been added;
— sample has been added;
— calculation and expression of results have been amended;
— precision has been amended;
— test report has been amended.
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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ISO 5071-1:2021(E)
Introduction
The volatile matter is determined as the loss in mass, corrected for moisture, when an analysis sample
of brown coal or lignite is heated out of contact with air under specified conditions. The test is empirical
and, in order to obtain reproducible results, it is essential that the rate of heating, the final temperature
and the overall duration of the test be carefully controlled. Due to the nature of brown coals and
lignites, initial heating of the sample at 400 °C is necessary to minimize the possibility of ejection of
sample from the test crucible.
Mineral matter associated with the sample may also lose mass under the conditions of the test, the
magnitude of the loss being dependent on both the nature and the quantity of the minerals present.
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INTERNATIONAL STANDARD ISO 5071-1:2021(E)
Brown coals and lignites — Determination of the volatile
matter in the analysis sample —
Part 1:
Two-furnace method
1 Scope
This document specifies a method of determining the volatile matter of brown coals and lignites.
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 1170, Coal and coke — Calculation of analyses to different bases
ISO 1213-2, Solid mineral fuels — Vocabulary — Part 2: Terms relating to sampling, testing and analysis
ISO 5068-2, Brown coals and lignites — Determination of moisture content — Part 2: Indirect gravimetric
method for moisture in the analysis sample
ISO 13909-4, Hard coal and coke — Mechanical sampling — Part 4: Coal — Preparation of test samples
ISO 18283, Coal and coke — Manual sampling
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1213-2 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Principle
The coal is heated out of contact with air for 7 min at 400 °C, then immediately transferred to another
furnace and heated at 900 °C for a further 7 min. The volatile matter mass fraction is calculated from
the loss in mass of the oven-dried sample or from the loss in mass of the analysis sample corrected for
moisture.
5 Reagents
5.1 Desiccants, fresh or freshly regenerated and preferably self-indicating. Suitable desiccants are
magnesium perchlorate, silica gel, activated alumina and anhydrous calcium sulfate.
WARNING — Magnesium perchlorate is a strong oxidizing agent. Do not attempt to regenerate
the absorbent. Do not permit contact with organic materials or reducing agent.
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