ISO 687:2024

International
Standard
ISO 687
Fourth edition
Coke — Determination of moisture
2024-03
in the general analysis test sample
Coke — Détermination de l'humidité de l'échantillon pour
analyse
Reference number
© ISO 2024
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ii
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 . 1
7 Preparation of the test sample. 2
8 Procedure . 2
9 Expression of results . 3
10 Precision . 3
10.1 Repeatability limit .3
10.2 Reproducibility limit .3
11 Test report . 3
Annex A (informative) Example of a suitable oven for drying in nitrogen . 4

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 fourth edition cancels and replaces the third edition (ISO 687:2010), which has been technically revised.
The main change is as follows:
— adding the optional use of nitrogen and a minimum free space oven.
Any feedback or questions on this document should be directed to the user’s national standards body. A
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iv
Introduction
The determination of moisture in the general analysis test sample is required to correct the results of certain
analytical determinations, e.g. volatile matter and hydrogen, for the effect of water in the determination and
to allow all determinations to be corrected to a dry basis.
Since coke is hygroscopic, its moisture will vary with a change in humidity of the atmosphere, and the
moisture in the genera
...