ASTM D2234/D2234M-09

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Designation:D2234/D2234M–09
Standard Practice for
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Collection of a Gross Sample of Coal
This standard is issued under the fixed designation D2234/D2234M; 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 (ϵ) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
Data obtained from coal samples are used in establishing price, controlling mine and cleaning plant
operations, allocating production costs, and determining plant or component efficiency. The task of
obtaining a sample of reasonable weight to represent an entire lot presents a number of problems and
emphasizes the necessity for using standard sampling procedures.
Coal is one of the most difficult of materials to sample, varying in composition from noncombus-
tible particles to those which can be burned completely, with all gradations in between. The task is
further complicated by the use of the analytical results, the sampling equipment available, the quantity
to be represented by the sample, and the degree of precision required.
This practice gives the overall requirements for the collection of coal samples. The wide varieties
ofcoal-handlingfacilitiesprecludethepublicationofdetailedproceduresforeverysamplingsituation.
The proper collection of the sample involves an understanding and consideration of the physical
character of the coal, the number and weight of increments, and the overall precision required.
1. Scope 2. Referenced Documents
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1.1 This practice covers procedures for the collection of a 2.1 ASTM Standards:
sample under various conditions of sampling. The sample is to D2013 Practice for Preparing Coal Samples for Analysis
becrushedandfurtherpreparedforanalysisinaccordancewith D7430 Practice for Mechanical Sampling of Coal
Practice D2013. However, the procedures for dividing large
3. Terminology
samples before any crushing are given in this practice. For the
sampling of coal using mechanical sampling systems see 3.1 Definitions of Terms Specific to This Standard:
3.1.1 accuracy:
D7430 Practice for the Mechanical Sampling of Coal.
1.2 This practice describes general and special purpose 3.1.1.1 generally—a term used to indicate the reliability of
a sample, a measurement, or an observation.
sampling procedures for coals (1) by size and condition of
preparation (for example, mechanically cleaned coal or raw 3.1.1.2 specifically—a measure of closeness of agreement
between an experimental result and the true value. Example:
coal) and (2) by sampling characteristics.
1.3 The values stated in either SI units or inch-pound units the observed and true sulfur content of a coal consignment.
This measure is affected by chance errors as well as by bias.
are to be regarded separately as standard. The values stated in
each system may not be exact equivalents; therefore, each 3.1.2 gross sample—a sample representing one lot of coal
and composed of a number of increments on which neither
system shall be used independently of the other. Combining
reduction nor division has been performed.
values from the two systems may result in non-conformance
with the standard. 3.1.3 increment—a small portion of the lot collected by one
operation of a sampling device and normally combined with
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the other increments from the lot to make a gross sample.
3.1.4 probability sample—a sample collected using a sam-
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- pling process such that at each stage of the process, a specified
non-zero probability of being selected for the sample can be
bility of regulatory limitations prior to use.
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This practice is under the jurisdiction of ASTM Committee D05 on Coal and
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Coke and are the direct responsibility of Subcommittee D05.23 on Sampling. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved May 15, 2009. Published June 2009. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1963. Last previous edition approved in 2007 as D2234 – 07. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D2234_D2234M-09. the ASTM website.
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D2234/D2234M–09
attached to every sampling unit in the lot to be sampled. Given 5.2 After further processing (Practice D2013), the sample
adequate information about the
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