ISO 562
the volatile matter is determined as the loss in mass, less that due to moisture,
when coal or coke is heated out of contact with air under standardized conditions. The test is empirical and, in
order to ensure reproducible results, it is essential that the rate of heating, the final temperature and the
overall duration of the test be carefully controlled. It is also essential to exclude air from the coal or coke
during heating to prevent oxidation. The fit of the crucible lid is, therefore, critical. The moisture content of the
sample is determined at the same time as the volatile matter so that the appropriate correction can be made.
Mineral matter associated with the sample can 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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