ASTM D3838-05(2011)
(Test Method)Standard Test Method for pH of Activated Carbon
Standard Test Method for pH of Activated Carbon
SIGNIFICANCE AND USE
When a fluid containing an adsorbate is passed through a bed of activated carbon, chemical reactions may take place between the activated carbon, its other noncarbonaceous constituents, and the adsorbate containing fluid. The pH of the carbon may be a significant parameter of such a reaction and therefore may be an important characteristic of the carbon.
SCOPE
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 6.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D3838 −05 (Reapproved 2011)
Standard Test Method for
pH of Activated Carbon
This standard is issued under the fixed designation D3838; 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 carbon may be a significant parameter of such a reaction and
therefore may be an important characteristic of the carbon.
1.1 This test method covers determination of the pH of a
water extract of activated carbon.
5. Apparatus and Materials
1.2 The values stated in SI units are to be regarded as
5.1 Analytical Balance, capacity 100 g, precision 6 0.01 g.
standard. No other units of measurement are included in this
standard.
5.2 Hot Plate.
1.3 This standard does not purport to address all of the
5.3 Glassware for Boiler-Reflux Condenser Apparatus (Fig.
safety concerns, if any, associated with its use. It is the
1)—Items shown are for guidance only, providing a convenient
responsibility of the user of this standard to establish appro-
set of equipment available off-the-shelf from many laboratory
priate safety and health practices and determine the applica-
supply houses. The “all-glass” elements, with standard-taper
bility of regulatory limitations prior to use. For specific hazard
and ball joints, provide freedom from contamination and
statements, see Section 6.
maintenance. A check valve in the position shown is essential
to relieve pressure buildup while minimizing loss of vapor.
2. Referenced Documents
5.4 Thermometer, glass, approximately 0 to 120°C, long
2.1 ASTM Standards:
enough to be read at 100°C when inserted to bottom of
D1193 Specification for Reagent Water
Erlenmeyer flask in Fig. 1.
D1293 Test Methods for pH of Water
5.5 Thermometer, glass, approximately 20 to 55°C.
D2867 Test Methods for Moisture in Activated Carbon
D6851 Test Method for Determination of Contact pH with
5.6 Graduated Cylinder, 100-mL.
Activated Carbon
5.7 Beaker, 200-mL.
E300 Practice for Sampling Industrial Chemicals
5.8 Filter Funnel.
3. Summary of Test Method
5.9 Filter Paper, qualitative, medium flow rate, 12.5 cm or
3.1 An activated carbon sample is boiled in reagent water
larger in diameter.
using a reflux condenser to recycle water vapor. The particles
5.10 Timer.
of carbon are filtered out, the filtrate cooled to 50°C and the pH
5.11 pH Meter, in accordance with Test Methods D1293,
of the filtrate determined by electrometic measurement.
Type II (automatic thermal compensation preferred).
4. Significance and Use
5.12 Reagent Water, in accordance with Specification
4.1 When a fluid containing an adsorbate is passed through D1193, Type II.
a bed of activated carbon, chemical reactions may take place
between the activated carbon, its other noncarbonaceous 6. Hazards
constituents, and the adsorbate containing fluid. The pH of the
6.1 The test method involves transfer of boiling water
between containers; appropriate tongs or gloves should be
used. In addition, the use of an electric hot plate and pH meter
This test method is under the jurisdiction of ASTM Committee D28 on
(if line-powered) poses a shock hazard. This equipment must
ActivatedCarbonandisthedirectresponsibilityofSubcommitteeD28.02onLiquid
Phase Evaluation.
be grounded and insulated in accordance with UL standards
Current edition approved March 1, 2011. Published May 2011. Originally
and electrical codes.
approved in 1980. Last previous edition approved in 2005 as D3838 – 05. DOI:
10.1520/D3838-05R11.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 7. Sampling
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
7.1 Guidance in sampling activated carbon is given in
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Practice E300.
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D3838−05 (2011)
with the distilled water used for the test. Catch the filtrate in a
500-mL vacuum filter flask
...
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