ASTM D2492-02(2012)

Standard Test Method for Forms of Sulfur in Coal (Withdrawn 2021)

SIGNIFICANCE AND USE
4.1 This test method provides for a separation of coal-associated sulfur into two commonly recognized forms: pyritic and sulfate. Organic sulfur is calculated by difference. Results obtained by the test method are used to serve a number of interests, including the evaluation of coal preparation and processing operations designed to reduce coal sulfur levels.
SCOPE
1.1 This test method applies to the determination of sulfate sulfur and pyritic sulfur in coal and calculates organic sulfur by difference. This test method is not applicable to coke or other carbonaceous materials. Monosulfides (pyrites and FeS2 are disulfides) of iron and elements such as cadmium, lead, vanadium, and zinc can be present in coal. In the range of 0 to 100 ppm, these monosulfides do not contribute significantly to the total inorganic sulfide content.  
1.2 The values stated in SI units are to be regarded as standard.  
1.3 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.
WITHDRAWN RATIONALE
This test method applies to the determination of sulfate sulfur and pyritic sulfur in coal and calculates organic sulfur by difference. This test method is not applicable to coke or other carbonaceous materials. Monosulfides (pyrites and FeS2 are disulfides) of iron and elements such as cadmium, lead, vanadium, and zinc can be present in coal. In the range of 0 to 100 ppm, these monosulfides do not contribute significantly to the total inorganic sulfide content
Formerly under the jurisdiction of Committee D05 on Coal and Coke, this test method was withdrawn in January 2021 in accordance with section 10.6.3 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.

General Information

• Status: Withdrawn
• Publication Date: 31-Aug-2012
• Withdrawal Date: 20-Jan-2021
• ICS: 75.160.10 - Solid fuels
• Technical Committee: D05 - Coal and Coke
• Drafting Committee: D05.21 - Methods of Analysis

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D2492 − 02 (Reapproved 2012)
Standard Test Method for
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Forms of Sulfur in Coal
This standard is issued under the fixed designation D2492; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 3. Summary of Test Method
3.1 Sulfate Sulfur:
1.1 This test method applies to the determination of sulfate
3.1.1 Sulfate sulfur is extracted from the analysis sample
sulfurandpyriticsulfurincoalandcalculatesorganicsulfurby
difference. This test method is not applicable to coke or other with dilute hydrochloric acid. The sulfate sulfur in the extract
is determined gravimetrically. Sulfates are soluble in hydro-
carbonaceous materials. Monosulfides (pyrites and FeS are
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chloric acid, but pyritic and organic sulfur are not.
disulfides) of iron and elements such as cadmium, lead,
vanadium, and zinc can be present in coal. In the range of 0 to
3.2 Pyritic Sulfur:
100 ppm, these monosulfides do not contribute significantly to
3.2.1 Pyritic sulfur is calculated as a stoichiometric combi-
the total inorganic sulfide content.
nation with iron.
3.2.2 Methods:
1.2 The values stated in SI units are to be regarded as
3.2.2.1 Referee Method, which can be used in cases of
standard.
dispute or arbitration. The iron combined in the pyritic state is
1.3 This standard does not purport to address all of the
extracted with dilute nitric acid from the coal residue remain-
safety concerns, if any, associated with its use. It is the
ingaftersulfateextraction(seeNote1).Theironisdetermined
responsibility of the user of this standard to establish appro-
by atomic absorption techniques (see Note 2).
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
NOTE 1—The sulfate extraction step also removes hydrochloric acid
soluble iron (nonpyritic iron) from the test specimen. A test specimen
separate from that used for the sulfate extraction could be used for the
2. Referenced Documents
nitric acid extraction of iron. In this case, both nonpyritic and pyritic iron
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areextractedfromthetestspecimen.Sincethereisevidencethatforsome
2.1 ASTM Standards:
coals the extraction of nonpyritic iron by nitric acids falls short of the
D1193Specification for Reagent Water
3,4
amount extracted by hydrochloric acid, the use of a separate test
D2013Practice for Preparing Coal Samples for Analysis
specimen for the nitric acid extraction of iron with subsequent correction
D3173Test Method for Moisture in theAnalysis Sample of
for the contribution of nonpyritic iron is not included in this test method.
Coal and Coke NOTE 2—Round-robin testing of the coal samples used to generate data
for the precision statement in this test method indicates that plasma
D3177TestMethodsforTotalSulfurintheAnalysisSample
emission techniques give results equivalent to those from atomic absorp-
of Coal and Coke
tion analysis for the determination of iron. However, emission analysis is
D3180Practice for Calculating Coal and Coke Analyses
highly susceptible to interferences from other analytes that may be
from As-Determined to Different Bases
dissolved during the extraction of iron. Selection of a wavelength that is
D4239Test Method for Sulfur in the Analysis Sample of free from interferences and linear over the range of iron anticipated for
emissionanalysiscanrequireadetailedcompositionalanalysisofthecoal
Coal and Coke Using High-Temperature Tube Furnace
mineral matter, thus limiting the practicality of this approach.
Combustion
E832Specification for Laboratory Filter Papers 3.2.2.2 Alternative Method, which can be used in routine
practice or when the concerned parties agree on this test
method. The iron originally combined in the pyritic state can
be extracted with dilute hydrochloric acid from the ash
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This test method is under the jurisdiction of ASTM Committee D05 on Coal
obtained by incinerating the coal residue remaining after
and Coke and is the direct responsibility of Subcommittee D05.21 on Methods of
Analysis.
Current edition approved Sept. 1, 2012. Published November 2012. Originally
approved in 1966. Last previous edition approved in 2007 as D2492–02(2007).
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DOI: 10.1520/D2492-02R12. Edwards, A. H., Daybell, G. N., and Pringle, W. J. S., “An Investigation into
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or Methods for the Determination of Forms of Sulfur in Coal,” Fuel,Vol 37, 1958, pp.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM 47–59.
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Standards volume information, ref
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