ASTM D5158-98(2005)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D5158 − 98(Reapproved 2005)
Standard Test Method for
Determination of Particle Size of Powdered Activated
Carbon by Air Jet Sieving
This standard is issued under the fixed designation D5158; 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.
1. Scope holder of the air-jet sieve assembly. Air is passed through the
sieve from a slowly-rotating nozzle to fluidize the sample for a
1.1 This test method covers the determination of the particle
given period of time. Exit air flow removes undersized par-
size of powdered activated carbons using an air-jet sieve
ticles downward through the test sieve to a collection canister.
device. For purposes of this test method, powdered activated
The amount of carbon retained on the test sieve is weighed and
carbon is defined as activated carbon in particle sizes predomi-
the percent passing the test sieve is computed by difference.
nantly smaller than 80 mesh.
For a particle size distribution, the test must be repeated using
1.2 The values stated in SI units are to be regarded as the
sieves with different openings.
standard. The inch-pound units given in parentheses are for
information only.
5. Significance and Use
1.3 This standard does not purport to address all of the
5.1 The particle size of powdered activated carbon is
safety concerns, if any, associated with its use. It is the
sometimes used to evaluate filter cake filtration rates and the
responsibility of the user of this standard to establish appro-
filter penetration in filtering applications. The selection and
priate safety and health practices and determine the applica-
handling of powdered activated carbon, and operation of
bility of regulatory limitations prior to use.
processes using powdered activated carbon, requires the
knowledge of the particle size.
2. Referenced Documents
NOTE 1—Relative humidity (RH) can affect the repeatability and
2.1 ASTM Standards:
accuracy of this test. Activated carbon not at equilibrium with the RH of
D2652 Terminology Relating to Activated Carbon
the ambient air may lose or gain weight accordingly, dependent upon
E11 Specification for Woven Wire Test Sieve Cloth and Test
whether or not the carbon picks up or loses moisture.
Sieves
E177 Practice for Use of the Terms Precision and Bias in 6. Apparatus
ASTM Test Methods
6.1 Air-Jet Sieve Assembly.
E300 Practice for Sampling Industrial Chemicals
6.2 Wire Cloth Sieves, bronze or stainless steel (stainless
E691 Practice for Conducting an Interlaboratory Study to
steel sieves preferred), 200 and 325 mesh, in accordance with
Determine the Precision of a Test Method
Specification E11. The sieves shall be 203 mm (8 in.) in
3. Terminology
diameter.
3.1 Definitions— Terms relating to this test method are
6.3 Brush, soft bristle.
defined in Terminology D2652.
6.4 Balance, with a sensitivity of 1.0 mg.
4. Summary of Test Method
6.5 Ultrasonic Bath, capable of cleaning 203-mm (8-in.)
diameter sieves.
4.1 A weighed sample of as-received powdered activated
carbon is placed in a test sieve that is inserted in the sieve
7. Sampling
This test method is under the jurisdiction of ASTM Committee D28 on
7.1 Activated carbon is not strictly a chemically and physi-
ActivatedCarbonandisthedirectresponsibilityofSubcommitteeD28.02onLiquid
cally homogeneous material.To enable performing meaningful
Phase Evaluation.
tests within the stated tolerances of theASTM test methods, it
Current edition approved Oct. 1, 2005. Published October 2005. Originally
is essential that sampling be performed to obtain as represen-
approved in 1991. Last previous edition approved in 1998 as D5158 – 98. DOI:
10.1520/D5158-98R05.
tative a sample as possible. When a small amount of sample
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
represents tons of material, the collection, mixing, and prepa-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
ration of samples is extremely important. The practice de-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. scribed in Practice E300 is suitable to ensure that sampling and
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D5158 − 98 (2005)
sample preparation of activated carbon is appropriate for the
R = weight of sample remaining on test sieve, g, and
performance of this test method. In absence of following
S = weight of sample used, g.
Practice E300, a detailed specific sampling and sample prepa-
10. Report
ration procedure, suitable to the parties involved, needs to be
prepared. 10.1 Report the following information:
10.1.1 Source of the sample,
8. Procedure
10.1.2 T
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