ASTM_D_2799_-_21.pdf

Designation:D279921Standard Test Method forMicroscopical Determination of the Maceral Composition ofCoal1This standard is issued under the fixed designation D2799;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the equipment and techniquesused for determining the physical composition of a coal samplein terms of volume percent of the organic components and ofmineral matter,if desired.1.2 The term weight is temporarily used in this test methodbecause of established trade usage.The word is used to meanboth force and mass and care must be taken to determine whichis meant in each case(the SI unit for force is newton and formass,kilogram).1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D121 Terminology of Coal and CokeD388 Classification of Coals by RankD2797 Practice for Preparing Coal Samples for Microscopi-cal Analysis by Reflected LightD2798 Test Method for Microscopical Determination of theVitrinite Reflectance of CoalD3174 Test Method for Ash in the Analysis Sample of Coaland Coke from CoalD4239 Test Method for Sulfur in the Analysis Sample ofCoal and Coke Using High-Temperature Tube FurnaceCombustionE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE562 Test Method for Determining Volume Fraction bySystematic Manual Point CountE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 DefinitionsFor definitions of terms,refer to Terminol-ogy D121.3.2 ClassificationThe classification of the microscopicconstituents into groups of similar properties in a given coal isas follows:Maceral GroupMaceralVitriniteLiptinite or(exinite)alginitecutiniteresinitesporiniteInertinitefusiniteinertodetrinitemacrinitemicrinitefunginitesecretinitesemifusinite3.3 Many laboratories associated with the coke-makingindustry use the following simplified classification for petro-graphic analysis of bituminous coal:vitriniteliptinite(other than resinite)resinitesemifusinitemicrinitefusinitemineral matter3.4 Definitions of Terms Specific to This Standard:3.4.1 alginite,na liptinite maceral that is generally spheri-cal or ovoid,frequently having a crenulated border andsomewhat irregular reflectance and sometimes occurring inclusters reflecting an origin from Botryococcus algae.1This test method is under the jurisdiction of ASTM Committee D05 on Coaland Coke and is the direct responsibility of Subcommittee D05.28 on PetrographicAnalysis of Coal and Coke.Current edition approved Dec.1,2021.Published December 2021.Originallyapproved in 1969.Last previous edition approved in 2021 as D2799 13(2021)1.DOI:10.1520/D2799-21.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1?3.4.1.1 DiscussionAlginite often occurs as degraded frag-ments derived from colonial or unicellular bodies.3.4.2 cutinite,na liptinite maceral in the form of a sheetreflecting its origin from leaf-or twig-covering plant cuticle,frequently exhibiting reticulation in planar section and aserrated edge in cross section.3.4.3 exinite,nDeprecated term.Use preferred term lip-tinite;sometimes has also been used as a synonym forsporinite.3.4.4 funginite,nan inertinite maceral occurring as roundor ovoid bodies,frequently containing voids,reflecting anorigin from fungal sclerotia;also occurs(especially in lowerrank coals)as interlaced,stringy materials derived from fungalhyphae.3.4.5 fusinite,nan inertinite maceral distinguished princi-pally by the preservation of some feature(s)of the plant cellwall structure,and with a particle size greater