ASTM D6796-21

Standard Practice for Production of Coal, Coke and Coal Combustion Samples for Interlaboratory Studies

SIGNIFICANCE AND USE
5.1 The objective of this practice is to provide guidelines for the preparation of samples for interlaboratory studies to evaluate new test methods or for quality control purposes.  
5.2 Samples prepared using these guidelines may be used for the testing of the precision and bias mandatory for ASTM test methods. Such an evaluation is necessary to provide guidance to the user as to the reliability of measurements that can be expected by its use. The statements are developed on the basis of user experience (ordinarily through interlaboratory studies) with the test method.  
5.3 The availability of appropriate samples is a key requirement for interlaboratory studies.  
5.4 The homogeneity of the sample produced for interlaboratory studies must be small enough so that the variance caused by the sample is small compared to the variance of the test being performed.
SCOPE
1.1 This practice describes the essential activities that are required to produce samples for interlaboratory studies.  
1.2 The suitability of a particular interlaboratory sample developed using this guide will depend on the tests being made.  
1.3 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Historical
• Publication Date: 31-Mar-2021
• ICS: 75.160.10 - Solid fuels
• Technical Committee: D05 - Coal and Coke
• Drafting Committee: D05.24 - Statistics

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D6796 − 21
Standard Practice for
Production of Coal, Coke and Coal Combustion Samples for
1
Interlaboratory Studies
This standard is issued under the fixed designation D6796; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope D2492TestMethodforFormsofSulfurinCoal(Withdrawn
3
2021)
1.1 This practice describes the essential activities that are
D2961PracticeforSingle-StageTotalMoistureLessthan15
required to produce samples for interlaboratory studies.
% in Coal Reduced to 2.36mm [No. 8 Sieve] Topsize
D3173Test Method for Moisture in theAnalysis Sample of
1.2 The suitability of a particular interlaboratory sample
Coal and Coke
developed using this guide will depend on the tests being
D3302/D3302MTest Method for Total Moisture in Coal
made.
D4596Practice for Collection of Channel Samples of Coal
1.3 Units—The values stated in SI units are to be regarded
in a Mine
asstandard.Nootherunitsofmeasurementareincludedinthis
D5192Practice for Collection of Coal Samples from Core
standard.
D5263Test Method for Determining the Relative Degree of
Oxidation in Bituminous Coal by Alkali Extraction
1.4 This standard does not purport to address all of the
D7430/D7430MPractice for Mechanical Sampling of Coal
safety concerns, if any, associated with its use. It is the
D7582Test Methods for Proximate Analysis of Coal and
responsibility of the user of this standard to establish appro-
Coke by Macro Thermogravimetric Analysis
priate safety, health, and environmental practices and deter-
E178Practice for Dealing With Outlying Observations
mine the applicability of regulatory limitations prior to use.
E691Practice for Conducting an Interlaboratory Study to
1.5 This international standard was developed in accor-
Determine the Precision of a Test Method
dance with internationally recognized principles on standard-
E826Practice for Testing Homogeneity of a Metal Lot or
ization established in the Decision on Principles for the
Batch in Solid Form by Spark Atomic Emission Spec-
Development of International Standards, Guides and Recom-
trometry
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions—For definitions of terms used in this
2. Referenced Documents
practice, refer to Terminology D121.
2
2.1 ASTM Standards:
D121Terminology of Coal and Coke
4. Summary of Practice
D346/D346MPractice for Collection and Preparation of
4.1 Test samples of adequately defined composition and
Coke Samples for Laboratory Analysis
homogeneity are required for interlaboratory studies. These
D2013/D2013MPractice for Preparing Coal Samples for
samples should be typical in all respects to the samples for
Analysis
which the test method is applicable.
D2234/D2234MPractice for Collection of a Gross Sample
4.1.1 Thesampleshouldbeofsufficientquantitytoperform
of Coal
all 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 run.
1
This practice is under the jurisdiction of ASTM Committee D05 on Coal and
4.2 Differences in results due to the homogeneity or
Coke and is the direct responsibility of Subcommittee D05.24 on Statistics.
oxidation, or both, of the test sample should be minimal with
Current edition approved April 1, 2021. Published April 2021. Originally
approved in 2002. Last previous edition approved in 2016 as D6796–16. DOI: respect to other errors.
10.1520/D6796-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D6796 − 21
5. Significance and Use 6.7 Sample preparation and distribution should provide
enough material and time so that laboratories can perform test
5.1 Theobjectiveofthispracticeistoprovideguidelinesfor
runs on new or unfamiliar methods. This is very important
the preparation of samples for interlaboratory studies to evalu-
because only laboratories that are thoroughly familiar and
ate new test methods or for quality control purposes.
experienced with the procedure can be considered qualified to
5.2 Samples prepared using these guidelines may be used
participate in the interlaboratory st
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D6796 − 16 D6796 − 21
Standard Practice for
Production of Coal, Coke and Coal Combustion Samples for
1
Interlaboratory Studies
This standard is issued under the fixed designation D6796; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This practice describes the essential activities that are required to produce samples for interlaboratory studies.
1.2 The suitability of a particular interlaboratory sample developed using this guide will depend on the tests being made.
1.3 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this
standard.
1.4 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D121 Terminology of Coal and Coke
D346/D346M Practice for Collection and Preparation of Coke Samples for Laboratory Analysis
D2013/D2013M Practice for Preparing Coal Samples for Analysis
D2234/D2234M Practice for Collection of a Gross Sample of Coal
3
D2492 Test Method for Forms of Sulfur in Coal (Withdrawn 2021)
D2961 Practice for Single-Stage Total Moisture Less than 15 % in Coal Reduced to 2.36 mm [No. 8 Sieve] Topsize
D3173 Test Method for Moisture in the Analysis Sample of Coal and Coke
D3302/D3302M Test Method for Total Moisture in Coal
D4596 Practice for Collection of Channel Samples of Coal in a Mine
D5192 Practice for Collection of Coal Samples from Core
D5263 Test Method for Determining the Relative Degree of Oxidation in Bituminous Coal by Alkali Extraction
D7430/D7430M Practice for Mechanical Sampling of Coal
D7582 Test Methods for Proximate Analysis of Coal and Coke by Macro Thermogravimetric Analysis
1
This practice is under the jurisdiction of ASTM Committee D05 on Coal and Coke and is the direct responsibility of Subcommittee D05.24 on Statistics.
Current edition approved March 1, 2016April 1, 2021. Published May 2016April 2021. Originally approved in 2002. Last previous edition approved in 20082016 as
D6796–02(2008).D6796 – 16. DOI: 10.1520/D6796-16.10.1520/D6796-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
The last approved version of this historical standard is referenced on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D6796 − 21
E178 Practice for Dealing With Outlying Observations
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E826 Practice for Testing Homogeneity of a Metal Lot or Batch in Solid Form by Spark Atomic Emission Spectrometry
3. Terminology
3.1 Definitions—For definitions of terms used in this practice, refer to Terminology D121.
4. Summary of Practice
4.1 Test samples of adequately defined composition and homogeneity are required for interlaboratory studies. These samples
should be typical in all respects to the samples for which the test method is applicable.
4.1.1 The sample should be of sufficient quantity to perform all necessary tests and replicates. Guidelines specifying minimum
quantities are given in Practice D2013/D2013M.
4.1.2 The top size must be consistent for the test being run.
4.2 Differences in results due to the homogeneity or oxidation, or both, of the test sample should be minimal with respect to other
errors.
5. Significance and Use
5.1 The objective of this practice is to provide guidelines for the preparation of samples for interlaboratory studies to evaluate new
test methods or for qualit
...