ASTM D6796-16

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 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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 29-Feb-2016
• 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 − 16
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 D5263Test Method for Determining the Relative Degree of
Oxidation in Bituminous Coal by Alkali Extraction
1.1 This practice describes the essential activities that are
D7582Test Methods for Proximate Analysis of Coal and
required to produce samples for interlaboratory studies.
Coke by Macro Thermogravimetric Analysis
1.2 The suitability of a particular interlaboratory sample
E178Practice for Dealing With Outlying Observations
developed using this guide will depend on the tests being
E691Practice for Conducting an Interlaboratory Study to
made.
Determine the Precision of a Test Method
E826Practice for Testing Homogeneity of a Metal Lot or
1.3 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this Batch in Solid Form by Spark Atomic Emission Spec-
trometry
standard.
1.4 This standard does not purport to address all of the
3. Terminology
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 3.1 Definitions—For definitions of terms used in this
priate safety and health practices and determine the applica- practice, refer to Terminology D121.
bility of regulatory limitations prior to use.
4. Summary of Practice
2. Referenced Documents
4.1 Test samples of adequately defined composition and
2
2.1 ASTM Standards:
homogeneity are required for interlaboratory studies. These
D121Terminology of Coal and Coke
samples should be typical in all respects to the samples for
D346/D346MPractice for Collection and Preparation of
which the test method is applicable.
Coke Samples for Laboratory Analysis
4.1.1 Thesampleshouldbeofsufficientquantitytoperform
D2013/D2013MPractice for Preparing Coal Samples for
all necessary tests and replicates. Guidelines specifying mini-
Analysis
mum quantities are given in Practice D2013/D2013M.
D2234/D2234MPractice for Collection of a Gross Sample
4.1.2 The top size must be consistent for the test being run.
of Coal
4.2 Differences in results due to the homogeneity or
D2492Test Method for Forms of Sulfur in Coal
oxidation, or both, of the test sample should be minimal with
D2961Test Method for Single-Stage Total Moisture Less
respect to other errors.
than 15 % in Coal Reduced to 2.36-mm (No. 8 Sieve)
Topsize
5. Significance and Use
D3173Test Method for Moisture in theAnalysis Sample of
5.1 Theobjectiveofthispracticeistoprovideguidelinesfor
Coal and Coke
the preparation of samples for interlaboratory studies to evalu-
D3302/D3302MTest Method for Total Moisture in Coal
ate new test methods or for quality control purposes.
D4596Practice for Collection of Channel Samples of Coal
in a Mine
5.2 Samples prepared using these guidelines may be used
for the testing of the precision and bias mandatory for ASTM
1
test methods. Such an evaluation is necessary to provide
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.
guidance to the user as to the reliability of measurements that
Current edition approved March 1, 2016. Published May 2016. Originally
canbeexpectedbyitsuse.Thestatementsaredevelopedonthe
approved in 2002. Last previous edition approved in 2008 as D6796–02(2008).
basis of user experience (ordinarily through interlaboratory
DOI: 10.1520/D6796-16.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or studies) with the test method.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
5.3 The availability of appropriate samples is a key require-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. ment for interlaboratory studies.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D6796 − 16
anddistributingsamples,thelengthoftimeandexpenseinperformingthe
5.4 The homogeneity of the sample produced for interlabo-
test and the commercial or legal need for reliable estimates of precision
ratorystudiesmustbesmallenoughsothatthevariancecaused
when choosing the number of materials to be used.
by the sample is small compared to the variance of the test
being performed. 7. Determining the Suitability of the Sample for the Test
Method
...

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 − 02 (Reapproved 2008) D6796 − 16
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 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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
D121 Terminology of Coal and Coke
D346D346/D346M Practice for Collection and Preparation of Coke Samples for Laboratory Analysis
D2013D2013/D2013M Practice for Preparing Coal Samples for Analysis
D2234/D2234M Practice for Collection of a Gross Sample of Coal
D2492 Test Method for Forms of Sulfur in Coal
D2961 Test Method for Single-Stage Total Moisture Less than 15 % in Coal Reduced to 2.36-mm (No. 8 Sieve) Topsize
D3172 Practice for Proximate Analysis of Coal and Coke
D3173 Test Method for Moisture in the Analysis Sample of Coal and Coke
D3302D3302/D3302M Test Method for Total Moisture in Coal
D4596 Practice for Collection of Channel Samples of Coal in a Mine
D5142 Test Methods for Proximate Analysis of the Analysis Sample of Coal and Coke by Instrumental Procedures (Withdrawn
3
2010)
D5263 Test Method for Determining the Relative Degree of Oxidation in Bituminous Coal by Alkali Extraction
D7582 Test Methods for Proximate Analysis of Coal and Coke by Macro Thermogravimetric Analysis
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 D2013D2013/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 Coke and is the direct responsibility of Subcommittee D05.24 on Statistics.
Current edition approved Feb. 1, 2008March 1, 2016. Published March 2008May 2016. Originally approved in 2002. Last previous edition approved in 20022008 as
D6796D6796–02(2008).–02. DOI: 10.1520/D6796-02R08.10.1520/D6796-16.
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D6796 − 16
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 quality control purposes.
5.2 These samples 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 e
...