ASTM D5263-93e1
(Test Method)Standard Test Method for Determining the Relative Degree of Oxidation in Bituminous Coal by Alkali Extraction
Standard Test Method for Determining the Relative Degree of Oxidation in Bituminous Coal by Alkali Extraction
SCOPE
1.1 This colorimetric method describes the determination of the relative degree of oxidation by alkali extraction of coals that are high volatile A bituminous to low volatile bituminous in rank.
1.2 This test cannot be sensitive to thermally oxidized coal. It is intended for coals that may be oxidized as a result of weathering.
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.
1.4 The values stated in SI units shall be regarded as standard.
General Information
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Standards Content (Sample)
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Designation:D5263–93
Standard Test Method for
Determining the Relative Degree of Oxidation in Bituminous
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Coal by Alkali Extraction
This standard is issued under the fixed designation D5263; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (ε) indicates an editorial change since the last revision or reapproval.
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ε NOTE—In 9.2, the value −2.36 mm was editorially corrected to −250 µm in October 2000.
1. Scope 5. Significance and Use
1.1 Thiscolorimetricmethoddescribesthedeterminationof 5.1 This test method is a relative measure of the degree of
the relative degree of oxidation by alkali extraction of coals oxidationpresentincoal.Itdoesnotdeterminethequantitative
that are high volatileAbituminous to low volatile bituminous amount of oxidized coal present. It is only intended to serve as
in rank. a guide to the supplier, buyer, and user for selecting coals for
1.2 This test cannot be sensitive to thermally oxidized coal. metallurgical use.
It is intended for coals that may be oxidized as a result of
NOTE 1—The values shown in Table 1 are based on the transmittance
weathering.
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obtained using the original procedure (wavelength at 520 nm, 17-mm
1.3 This standard does not purport to address all of the
light path, 2– to 3-min boiling time, dilution of the extract to 80 mL).At
safety concerns, if any, associated with its use. It is the
these conditions, coals that had transmittance values greater than 90%
were considered to be unoxidized, coals less than 80% were considered
responsibility of the user of this standard to establish appro-
to be oxidized, and coals between 80 and 90% were considered suspect.
priate safety and health practices and determine the applica-
Asthisprocedurebecomesacceptedasthestandardandmoreexperimen-
bility of regulatory limitations prior to use.
tal data are gathered, modifications to these cutoff values are expected.
1.4 The values stated in SI units shall be regarded as
Note that lower rank bituminous coals are more easily extracted than
standard.
higher rank coal.
2. Referenced Documents
6. Apparatus
2.1 ASTM Standards:
6.1 TransmissionSpectrophotometer—Single-beam,grating
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D1193 Specification for Reagent Water
spectrophotometer having a wavelength range of 340 to 900
D4621 GuideforAccountabilityandQualityControlinthe
nm.
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Coal Analysis Laboratory
6.2 GlassTestTubes/Cuvettes,withlightpathsrangingfrom
10 to 17 mm may be used. Test tubes with an inside diameter
3. Terminology
of 17 6 0.3 mm are commonly used.
3.1 There are no terms in this standard that require new or
6.3 Analytical Balance, sensitive to 0.001 g.
other than dictionary definitions.
6.4 Hot Plate, capable of bringing aqueous solutions to a
boil.
4. Summary of Test Method
6.5 Thermometer, capable of measuring up to 100°C with a
4.1 Humic acids, which are present in oxidized coals, are
sensitivity of 60.5°C.
extracted from the coal with sodium hydroxide solution. The
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6.6 Filter Papers, Type II, Class F and G.
degree of oxidation is determined by colorimetrically measur-
6.7 Timer, capable of measuring 30 min to the nearest
ing the transmittance of the alkali extract solution at 520 nm.
second.
The intensity of the color produced by the humic acids is a
6.8 Graduated Cylinder, 100-mL capacity.
function of the degree of oxidation.
6.9 Beakers, 400-mL capacity.
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ThistestmethodisunderthejurisdictionofASTMCommitteeD-5onCoaland
Coke and is the direct responsibility of Subcommittee D05.15 on Metalurgical
Properties of Coal and Coke.
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Current edition approved Aug. 15, 1993. Published October 1993. Originally Lowenhaupt, D. E., and Gray, R. J., International Journal of Coal Geology,
published as D5263–92. Last previous edition D5263–92. 1980, Vol 1, pp. 63–73.
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Annual Book of ASTM Standards, Vol 11.01. Whatman Grade Nos. 40 and 42 filter papers, or equivalent, have been found
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Annual Book of ASTM Standards, Vol 05.06. suitable for this purpose.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D5263–93
TABLE 1 Guidelines for General Acceptance/Rejection Levels of
9.9 Filter (by gravity) the entire blank solution or test
Oxidized Coal
solution, or both, on a stack of oneType II Class F filter paper
Percent Transmittance at
on top of oneType II Glass G filter paper. Filter the slurry into
Interpretation of Results
520 nm, 17-mm Light Path
a 100-mL graduated cylinder, making sure funnel and gradu-
>90 Coal is not oxidized. Suitable for metallurgical
ated cylinder are dry before each test. After filtration, add
usage.
deionized (distilled) water (Type II, Specification D
...
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