ASTM D2867-99

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Designation: D 2867 – 99
Standard Test Methods for
Moisture in Activated Carbon
This standard is issued under the fixed designation D 2867; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope accurately. The weight loss is expressed as a percentage of the
weight of the original sample.
1.1 These test methods provide two procedures for the
3.2 Xylene-Extraction Test Method— A known, accurate
determination of the moisture content of activated carbon. The
weight of carbon is put into a boiling flask. A known volume of
procedures may also be used to dry samples required for other
xylene is added to the flask and the flask then connected to a
tests. The oven-drying method is used when water is the only
water trap. A hot plate is used to heat the xylene until boiling.
volatile material present and is in significant quantities, and the
The temperature is controlled to allow steady reflux. Reflux
activated carbon is not heat-sensitive (some activated carbons
continues until no further water can be collected in the trap.
can ignite spontaneously at temperatures as low as 150°C). The
The weight of water collected is expressed as a percentage of
xylene-extraction method is used when a carbon is known or
the weight of the original sample.
suspected to be heat sensitive or to contain nonwater-miscible
organic compounds instead of or in addition to water. The
4. Significance and Use
oven-drying method described in these test methods may be
4.1 The moisture content of activated carbon is often
used as the reference for development of instrumental tech-
required to define and express its properties in relation to the
niques for moisture determination in activated carbon.
net weight of the carbon.
1.2 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
OVEN-DRYING METHOD
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Apparatus
bility of regulatory limitations prior to use.
5.1 Moisture Oven—Most commercial, electrically heated,
forced-circulation drying ovens capable of temperature regu-
2. Referenced Documents
lation between 145 and 155°C may be used.
2.1 ASTM Standards:
5.2 Capsules with Covers—Low-form glass weighing
E 177 Practice for Use of the Terms Precision and Bias in
bottles with ground-glass stoppers or seamless metal boxes
ASTM Test Methods
with covers may be used. They should be as shallow as
E 691 Practice for Conducting an Interlaboratory Study to
possible, consistent with convenient handling.
Determine the Precision of a Test Method
5.3 Desiccator.
3. Summary of Test Methods
6. Materials
3.1 Oven-Drying Test Method—A sample of carbon is put
6.1 Desiccant—Anhydrous calcium chloride or other suit-
into a dry, closed capsule (of known weight) and weighed
able desiccant.
accurately. The capsule is opened and placed with the lid in a
preheated oven. The sample is dried to constant weight then
7. Procedure for Activated Carbon Passing A No. 50
removed from the oven and with the capsule closed, cooled to
Sieve
ambient temperature. The closed capsule is weighed again
7.1 Dip out with a spoon or spatula from the sample bottle
a 1 to 2-g representative sample. Put this into a predried tared
capsule with lid, close and weigh at once to the nearest 0.5 mg.
The depth of the carbon in the capsule must not exceed 1.25
These test methods are under the jurisdiction of ASTM Committee D-28 on
Activated Carbon and are the direct responsibility of Subcommittee D28.04 on Gas
cm.
Phase Evaluation Tests.
7.2 Remove the cover and place the capsule and cover in a
Current edition approved Feb. 10, 1999. Published May 1999. Originally
preheated forced circulation oven (at 145 to 155°C). Close the
published as D 2867 – 70. Last previous edition D 2867 – 95.
ASTM Book of ASTM Standards, Vol 14.02. oven and dry to constant weight (3 h normally sufficient). Open
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 2867 – 99
the oven and cover the capsules quickly. Cool in a desiccator to
ambient temperature and weigh.
8. Procedure for Activated Carbon Larger Than A No.
50 Sieve
8.1 Usea5to 10-g representative sample and weigh to the
nearest 2 mg. Complete the determination as described in
Section 7.
9. Calculation
9.1 Calculate the moisture content as follows:
Moisture, weight % 5 [~C 2 D! / ~C 2 B!# 3 100
where:
B = weight of capsule with cover, g,
C = weight of capsule with cover plus original sample, g,
and
D = weight of capsule with cover plus dried sample, g.
XYLENE–EXTRACTION METHOD
10. Apparatus
10.1 Boiling Flask—A 300-mL flat-bottom Erlenmeyer
flask with ground-glass joints.
10.2 Condens
...