ASTM D2799-05

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact ASTM
International (www.astm.org) for the latest information.
Designation:D 2799–05
Standard Test Method for
Microscopical Determination of the Maceral Composition of
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Coal
This standard is issued under the fixed designation D 2799; 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
Maceral Group Maceral
Vitrinite —
1.1 This test method covers the equipment and techniques
Liptinite or (exinite) alginite
usedfordeterminingthephysicalcompositionofacoalsample
cutinite
resinite
in terms of volume percent of the organic components and of
sporinite
mineral matter, if desired.
Inertinite fusinite
1.2 The term weight is temporarily used in this test method
inertodetrinite
macrinite
because of established trade usage. The word is used to mean
micrinite
bothforceandmassandcaremustbetakentodeterminewhich
sclerotinite
is meant in each case (the SI unit for force is newton and for semifusinite
mass, kilogram).
3.3 Definitions of Terms Specific to This Standard:
1.3 This standard does not purport to address all of the
3.3.1 alginite, n—aliptinitemaceralthatisgenerallyspheri-
safety concerns, if any, associated with its use. It is the
cal or ovoid, frequently having a crenulated border and
responsibility of the user of this standard to establish appro-
somewhat irregular reflectance and sometimes occurring in
priate safety and health practices and determine the applica-
clusters reflecting an origin from Botryococcus algae.
bility of regulatory limitations prior to use.
3.3.1.1 Discussion—Alginite often occurs as degraded frag-
ments derived from colonial or unicellular bodies.
2. Referenced Documents
3.3.2 cutinite, n—a liptinite maceral in the form of a sheet
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2.1 ASTM Standards:
reflecting its origin from leaf- or twig-covering plant cuticle,
D 121 Terminology of Coal and Coke
frequently exhibiting reticulation in planar section and a
D 2797 Practice for Preparing Coal Samples for Micro-
serrated edge in cross section.
scopic Analysis by Reflected Light
3.3.3 exinite, n—Deprecated term. Use preferred term lip-
D 2798 Test Method for Microscopical Determination of
tinite; sometimes has also been used as a synonym for
the Vitrinite Reflectance of Coal
sporinite.
D 3174 TestMethodforAshintheAnalysisSampleofCoal
3.3.4 fusinite, n—an inertinite maceral distinguished princi-
and Coke from Coal
pally by the preservation of some feature(s) of the plant cell
D 3177 TestMethodforTotalSulfurintheAnalysisSample
wall structure, and with a particle size greater than 50 µm
of Coal and Coke
except when it occurs as a fragment within the binder matrix;
see also semifusinite.
3. Terminology
3.3.5 inertinite, n—macerals that exhibit higher reflectance
3.1 Definitions—For definitions of terms, refer to Terminol-
than other organic substances in the coal.
ogy D 121.
3.3.5.1 Discussion—In any coal ranked lower than anthra-
3.2 Classification—The classification of the microscopic
citic, inertinite reflectance commonly spans the range from
constituents into groups of similar properties in a given coal is
only slightly higher than associated vitrinite to very high
as follows:
reflectance (often as high as Ro$ 6 %). In anthracitic rank
coals, inertinite reflectance may be lower than that of vitrinite,
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This test method is under the jurisdiction of ASTM Committee D05 on Coal and is then recognized by its morphology and form of
and Coke and is the direct responsibility of Subcommittee D05.28 on Petrographic
anisotropy. Highly reflecting inertinite commonly exhibits
Analysis of Coal and Coke.
relief on polished surface. Its name derives from the fact that
Current edition approved May 1, 2005. Published May 2005. Originally
most varieties behave inertly in the thermoplastic deformation
approved in 1969. Last previous edition approved in 1999 as D 2799 – 99.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
during the coking process (except in its lowest reflecting
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
manifestation). The volatile matter yield of inertinite is lower
Standards volume information, refer to the standard’s Document Summary page on
than that of other macerals in the same coal.
the ASTM website.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact ASTM
International (www.astm.org) for the latest information.
D 2799–05
3.3.6 inertodetrinite, n—an inertinite maceral occurring as 3.3.10 macrinite, n—an inertinite mace
...