1、Designation:D6796211Standard Practice forProduction of Coal,Coke and Coal Combustion Samples forInterlaboratory Studies1This standard is issued under the fixed designation D6796;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the yea
2、r 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.1NOTEEditorial corrections were made to X1.1.13,X1.1.14,and X2.2.2 in June 2021.1.Scope1.1 This practice describes the essential
3、activities that arerequired to produce samples for interlaboratory studies.1.2 The suitability of a particular interlaboratory sampledeveloped using this guide will depend on the tests beingmade.1.3 UnitsThe values stated in SI units are to be regardedas standard.No other units of measurement are in
4、cluded in thisstandard.1.4 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 limita
5、tions prior to use.1.5 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 Te
6、chnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D121 Terminology of Coal and CokeD346/D346M Practice for Collection and Preparation ofCoke Samples for Laboratory AnalysisD2013/D2013M Practice for Preparing Coal Samples forAnalysisD2234/D2234M Practice for Collection
7、of a Gross Sampleof CoalD2492 Test Method for Forms of Sulfur in Coal(Withdrawn2021)3D2961 Practice for Single-Stage Total Moisture Less than 15%in Coal Reduced to 2.36 mm No.8 Sieve TopsizeD3173 Test Method for Moisture in the Analysis Sample ofCoal and CokeD3302/D3302M Test Method for Total Moistu
8、re in CoalD4596 Practice for Collection of Channel Samples of Coalin a MineD5192 Practice for Collection of Coal Samples from CoreD5263 Test Method for Determining the Relative Degree ofOxidation in Bituminous Coal by Alkali ExtractionD7430/D7430M Practice for Mechanical Sampling of CoalD7582 Test M
9、ethods for Proximate Analysis of Coal andCoke by Macro Thermogravimetric AnalysisE178 Practice for Dealing With Outlying ObservationsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE826 Practice for Testing Homogeneity of a Metal Lot orBatch in Solid F
10、orm by Spark Atomic Emission Spec-trometry3.Terminology3.1 DefinitionsFor definitions of terms used in thispractice,refer to Terminology D121.4.Summary of Practice4.1 Test samples of adequately defined composition andhomogeneity are required for interlaboratory studies.Thesesamples should be typical
11、 in all respects to the samples forwhich the test method is applicable.4.1.1 The sample should be of sufficient quantity to performall necessary tests and replicates.Guidelines specifying mini-mum quantities are given in Practice D2013/D2013M.4.1.2 The top size must be consistent for the test being
12、run.4.2 Differences in results due to the homogeneity oroxidation,or both,of the test sample should be minimal withrespect to other errors.1This practice is under the jurisdiction of ASTM Committee D05 on Coal andCoke and is the direct responsibility of Subcommittee D05.24 on Statistics.Current edit
13、ion approved April 1,2021.Published April 2021.Originallyapproved in 2002.Last previous edition approved in 2016 as D6796 16.DOI:10.1520/D6796-21E01.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards
14、volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standa
15、rd 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.15.Signific
16、ance and Use5.1 The objective of this practice is to provide guidelines forthe preparation of samples for interlaboratory studies to evalu-ate new test methods or for quality control purposes.5.2 Samples prepared using these guidelines may be usedfor the testing of the precision and bias mandatory for ASTMtest methods.Such an evaluation is necessary to provideguidance to the user as to the reliability of measurements thatcan be expected by its use.The statements are developed on thebasis of user
