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Ref. NO. : ISO/R 687-1968 (E)
IS0
INTERN AT I ON A L ORGAN I2 AT I ON FOR S TA N DA RD 12 AT1 ON
IS0 RECOMMENDATION
R 687
DETERMINATION OF MOISTURE
IN THE ANALYSIS SAMPLE OF COKE
1 st EDITION
March 1968
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For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 687, Determination of moisture in the analysis sample of coke,
was drawn up by Technical Committee ISO/TC 27, Solid Mineral Fuels, the Secretariat of which is
held by the British Standards Institution (BSI).
Work on this question by the Technical Committee began in 1958 and led, in 1961, to the
adoption of a Draft IS0 Recommendation.
In March 1964, this Draft IS0 Recommendation (No. 682) was circulated to all the IS0
Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial nature, by
the following Member Bodies :
Australia France Romania
Austria Germany South Africa,
Belgium
India Rep. of
Brazil Italy Switzerland
Canada
Japan Turkey
Chile Korea, Rep. of U.A.R.
Colombia Netherlands United Kingdom
Czechoslovakia New Zealand U.S.A.
Denmark Poland U.S.S.R.
No Member Body opposed the approval of the Draft.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council
which decided, in March 1968, to accept it as an IS0 RECOMMENDATION.
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ISO/R 687-1968 (I
IS0 Recommendation R 687 March 1968
DETERMINATION OF MOISTURE
IN THE ANALYSIS SAMPLE OF COKE
INTRODUCTION
Since coke is hygroscopic, its moisture will vary with change of humidity of the atmosphere. The
moisture in the analysis sample should, therefore, be determined whenever portions are weighed out
for other analytical determinations. for example, volatile matter. for calorific value or for carbon
and hydrogen. If all the portions taken for analysis are weighed out on the same day and at about the
same time and if the analyses are proceeded with without delay, otic detcrmination of moisture
should suffice.
1. SCOPE
This IS0 Recommendation describes the method of determining the moisture content of an analysis
sample of coke.
2. PRINCIPLE
A sample of the coke is heated in air at a temperature between 100 and 210 OC (see Note i) and
maintained at this temperature until constant in mass. The percentage moisture content is calculated
from the loss in mass of the sample.
3. REAGENT
Desiccant. Activated alumina, silica gel, anhydrous calcium sulphate, phosphorus pentoxide, or mag-
nesium perchlorate (see Note 3). either fresh or freshly regenerated, preferably self-indicating.
4. APPARATUS
Balance. accurate to 0.1 mg
4.1
4.2 Air oven. capable of maintaining a temperature within the range 190 to 110 OC (see Note 1)
and in which the atmosphere changes from 3 to 8 times per hour.
4.3 Weighing vessels. Shallow vessels of glass with ground-on covers or of non-corrodible metal with
well-fitting covers, of such a size that the concentration of the coke layer does not exceed
0.15 g/cm* (see Note 2). Silica or porcelain dishes, of the same size and 10 to 15 mm deep,
having suitable covers, may also be used if precautions are taken to avoid the effect of absorp-
tion of moisture by the dishes.
4.4 Desiccator, containing a metal plate, preferabl
...