ASTM D1756-96(2000)
(Test Method)Standard Test Method for Determination as Carbon Dioxide of Carbonate Carbon in Coal
Standard Test Method for Determination as Carbon Dioxide of Carbonate Carbon in Coal
SCOPE
1.1 This test method covers the determination of carbon dioxide in coal in any form, such as mineral carbonate, from which carbon dioxide is released by action of mineral acids. It applies to high-carbonate and low-carbonate coals.
1.2 The values stated in SI units are to be regarded as the 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.
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Designation: D 1756 – 96 (Reapproved 2000)
Standard Test Method for
Determination as Carbon Dioxide of Carbonate Carbon in
Coal
This standard is issued under the fixed designation D 1756; 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 1 shall be considered permissible so long as results agree
within the accepted precision.
1.1 This test method covers the determination of carbon
5.2 Air-Purifying Train, consisting of the following units
dioxide in coal in any form, such as mineral carbonate, from
arranged in the order of passage of air: Any convenient form of
which carbon dioxide is released by action of mineral acids. It
flow meter (1) connected to a carbon dioxide absorber (2) filled
applies to high-carbonate and low-carbonate coals.
with an acceptable absorbent. The absorber (2) shall be
1.2 The values stated in SI units are to be regarded as the
connected to a trap (3).
standard.
5.3 Reaction Unit, consisting of a 300-mL wide-mouth flask
1.3 This standard does not purport to address all of the
(5) fitted with a three-hole rubber stopper. One hole is to
safety concerns, if any, associated with its use. It is the
accommodate a 60-mL open-end separatory funnel (4) extend-
responsibility of the user of this standard to establish appro-
ing almost to the bottom of the flask (5). The second hole in the
priate safety and health practices and determine the applica-
stopper is used to connect the purifying train through the trap
bility of regulatory limitations prior to use.
(3); the tip of the glass tubing shall extend almost to the bottom
2. Referenced Documents
of flask (5). The third hole of the stopper shall be fitted to a
water-cooled condenser (6).
2.1 ASTM Standards:
5.4 Absorption Unit, consisting of a water absorber (7) filled
D 1193 Specification for Reagent Water
with an acceptable desiccant connected to the condenser (6)on
D 2013 Method of Preparing Coal Samples for Analysis
the one side and on the other side to absorber (8) containing
D 2234 Practice for Collection of a Gross Sample of Coal
anhydrous copper sulfate on pumice or granular silver sulfate.
3. Summary of Test Method
The carbon dioxide absorber (9) shall be connected to absorber
(8) and to another water absorber (10). The absorber (10) shall
3.1 The determination of carbon dioxide is made by decom-
be connected to a T-piece stopcock (11) which in turn shall be
posing with acid a weighed quantity of the sample in a closed
attached to a filter-flask (12). The system shall be aspirated by
system and absorbing the carbon dioxide in an absorbent. The
a water pump (13).
increase in weight of the absorbent is a measure of the carbon
dioxide in the sample used.
6. Purity of Reagents
4. Significance and Use
6.1 Purity of Reagents—Reagent grade chemicals shall be
used in all tests. Unless otherwise indicated, it is intended that
4.1 Small amounts of mineral carbonates occur in many
all reagents shall conform to the specifications of the Commit-
coals and comparatively large amounts in some coals. The
tee on Analytical Reagents of the American Chemical Society,
determination of these carbonates is the purpose of this test
where such specifications are available. Other grades may be
method. The value found for carbon dioxide is used to estimate
used, provided it is first ascertained that the reagent is of
the mineral matter content, particularly CaCO and MgCO ,of
3 3
high-carbonate coals.
5. Apparatus (see Fig. 1)
For further information regarding this determination, see Krumin, P. O., “The
Meigs Creek No. 9 Coal Bed in Ohio, Part III—Further Study of the Chemical and
5.1 The use of apparatus modified from that shown in Fig.
Physical Properties, and Washability Characteristics, with a Brief Review of New
Methods Employed,” Bulletin No. 165, Ohio State University, Engineering Experi-
ment Station, (1957), pp. 38–46; and Krumin, P. O., and Svanks, K., “Four Methods
This test method is under the jurisdiction of ASTM Committee D05 on Coal of Determination of Carbon Dioxide in Solid Fuels,” ASTM Bulletin, No. 227,
and Coke and is the direct responsibility of Subcommittee D05.21 on Methods of January 1958, pp. 51–57.
Analysis. Reagent Chemicals, American Chemical Society Specifications,” Am. Chemi-
Current edition approved April 10, 1996. Published June 1996. Originally cal Society, Washington, DC. For suggestions on the testing of reagents not listed by
published as D 1756–60T. Last previous edition D 1756–89 (1993). the American Chemical Society, see Analar Standards for Laboratory Chemicals,
Annual Book of ASTM Standards, Vol 11.01. BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia and National
Annual Book of ASTM Standards, Vol 05.06. Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville, MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
D 1756
FIG. 1 Apparatus for the Determination of Carbon Dioxide
sufficiently high purity to permit its use without lessening the 8.2 The system shall be calibrate
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