ASTM D2867-09

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Designation: D2867 − 09
StandardTest Methods for
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Moisture in Activated Carbon
This standard is issued under the fixed designation D2867; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 3. Summary of Test Methods
3.1 Oven-Drying Test Method—A sample of carbon is put
1.1 These test methods provide three procedures for the
into a dry, closed capsule (of known weight) and weighed
determination of the moisture content of activated carbon. The
accurately. The capsule is opened and placed with the lid in a
procedures may also be used to dry samples required for other
preheated oven. The sample is dried to constant weight then
tests. The oven-drying and moisture balance methods are used
removed from the oven and with the capsule closed, cooled to
when water is the only volatile material present and is in
ambient temperature. The closed capsule is weighed again
significant quantities, and the activated carbon is not heat-
accurately. The weight loss is expressed as a percentage of the
sensitive (some activated carbons can ignite spontaneously at
weight of the original sample.
temperatures as low as 150°C). The xylene-extraction method
3.2 Xylene-Extraction Test Method— A known, accurate
is used when a carbon is known or suspected to be heat
weightofcarbonisputintoaboilingflask.Aknownvolumeof
sensitive or to contain nonwater-miscible organic compounds
xylene is added to the flask and the flask then connected to a
instead of or in addition to water. The oven-drying method
water trap. A hot plate is used to heat the xylene until boiling.
described in these test methods may be used as the reference
The temperature is controlled to allow steady reflux. Reflux
for development of instrumental techniques for moisture de-
continues until no further water can be collected in the trap.
termination in activated carbon.
The weight of water collected is expressed as a percentage of
1.2 The values stated in SI units are to be regarded as
the weight of the original sample.
standard. No other units of measurement are included in this
3.3 Moisture Balance Test Method—A sample of activated
standard.
carbonisplacedinamoisturebalanceandtheweightmeasured
1.3 This standard does not purport to address all of the
accurately. The sample is dried to constant weight. The weight
safety concerns, if any, associated with its use. It is the
loss is expressed as a percentage of the weight of the original
responsibility of the user of this standard to establish appro-
sample.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 4. Significance and Use
4.1 The moisture content of activated carbon is often
2. Referenced Documents
required to define and express its properties in relation to the
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net weight of the carbon.
2.1 ASTM Standards:
E177 Practice for Use of the Terms Precision and Bias in
4.2 The moisture content of activated carbon packed in
ASTM Test Methods
typical shipping containers will usually increase during trans-
E691 Practice for Conducting an Interlaboratory Study to
portation and storage. Users of activated carbon in applications
Determine the Precision of a Test Method where low moisture content is important should be aware of
this effect.
OVEN-DRYING METHOD
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These test methods are under the jurisdiction of ASTM Committee D28 on
Activated Carbon and are the direct responsibility of Subcommittee D28.04 on Gas
5. Apparatus
Phase Evaluation Tests.
Current edition approved Nov. 1, 2009. Published December 2009. Originally
5.1 Moisture Oven—Most commercial, electrically heated,
approved in 1970. Last previous edition approved in 2004 as D2867 – 04. DOI:
forced-circulation drying ovens capable of temperature regu-
10.1520/D2867-09.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or lation between 145 and 155°C may be used.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.2 Capsules with Covers—Low-form glass weighing
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. bottles with ground-glass stoppers or seamless metal boxes
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D2867 − 09
with covers may be used. They should be as shallow as 11. Reagent
possible, consistent with convenient handling.
11.1 Xylene—Reagent grade in accordance with the speci-
5.3 Desiccator. fic
...