ASTM D2866-94(1999)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D 2866 – 94 (Reapproved 1999)
Standard Test Method for
Total Ash Content of Activated Carbon
This standard is issued under the fixed designation D 2866; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 5.4 Desiccator.
5.5 Oven, forced-air circulation, capable of temperature
1.1 This test method describes a procedure for the determi-
regulation between 145 and 155°C.
nation of total ash content of activated carbon.
1.2 This standard does not purport to address all of the
6. Procedure
safety concerns, if any, associated with its use. It is the
6.1 Ignite the crucible in the muffle furnace at 6506 25°C
responsibility of the user of this standard to establish appro-
for 1 h. Place the crucible in the desiccator. Cool to room
priate safety and health practices and deterrmine the applica-
temperature and weigh to the nearest 0.1 mg.
bility of regulatory limitations prior to use.
6.2 Dry an adequate sample of activated carbon to constant
2. Referenced Documents weight at 150 6 5°C (3 h is usually sufficient).
2.1 ASTM Standards:
NOTE 1—Some carbons can ignite spontaneously at 150°C. In this case,
D 2867 Test Methods for Moisture in Activated Carbon moist carbon should be used with a correction for moisture (in accordance
with Methods D 2867) applied in the calculations. In this case, the ashing
E 177 Practice for Use of the Terms Precision and Bias in
should be started in a cold muffle furnace.
ASTM Test Methods
E 691 Practice for Conducting an Interlaboratory Study to
6.3 Weigh out to the nearest 0.1 mg sufficient dried acti-
Determine Precision of a Test Method
vated carbon, so that the estimated amount of ash will be 0.1 g,
into the ignited crucible and place the crucible in the furnace at
3. Summary of Test Method
650 6 25°C. Ashing will require from 3 to 16 h, depending on
3.1 An accurately weighed sample of dried activated carbon
the size and type of activated carbon. Ashing can be considered
is placed in a controlled-temperature muffle furnace for a
complete when constant weight is achieved.
period of several hours. When constant weight has been
6.4 Place the crucible in the desiccator and allow to cool to
achieved, the crucible is cooled to ambient temperature in a
room temperature. After the sample has cooled in the desicca-
desiccator and reweighed. The weight of the ashed carbon is
tor, admit air slowly to avoid loss of ash from the crucible.
expresesed as a percentage of the weight of the original carbon
Weigh to the nearest 0.1 mg.
sample.
7. Calculation
4. Significance and Use
7.1 Calculate the ash content as follows:
4.1 In specific end uses, the amount and composition of the
Total ash, % 5 @~D 2 B!/~C 2 B!# 3 100 (1)
ash may influence the capabilities and certain desired proper-
ties of activated carbon.
where:
5. Apparatus
B = weight of crucible, g,
C = weight of crucible plus original sample, g, and
5.1 Muffle Furnace, having air circulation, capable of t
...