ASTM D2492-02

Standard Test Method for Forms of Sulfur in Coal

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.

General Information

• Status: Historical
• Publication Date: 09-Sep-2002
• ICS: 75.160.10 - Solid fuels
• Technical Committee: D05 - Coal and Coke
• Drafting Committee: D05.21 - Methods of Analysis

Relations

• Replaces: ASTM D2492-90(1998) - Standard Test Method for Forms of Sulfur in Coal
• Effective Date: 10-Sep-2002
• Replaced By: ASTM D2492-02(2007) - Standard Test Method for Forms of Sulfur in Coal
• Effective Date: 01-May-2007
• Referred By: ASTM D6796-21e1 - Standard Practice for Production of Coal, Coke and Coal Combustion Samples for Interlaboratory Studies
• Effective Date: 10-Sep-2002

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
Standard Test Method for
1
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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope is determined gravimetrically. Sulfates are soluble in hydro-
chloric acid, but pyritic and organic sulfur are not.
1.1 This test method applies to the determination of sulfate
3.2 Pyritic Sulfur:
sulfurandpyriticsulfurincoalandcalculatesorganicsulfurby
3.2.1 Pyritic sulfur is calculated as a stoichiometric combi-
difference. This test method is not applicable to coke or other
nation with iron.
carbonaceous materials. Monosulfides (pyrites and FeS are
2
3.2.2 Methods:
disulfides) of iron and elements such as cadmium, lead,
3.2.2.1 Referee Method, which can be used in cases of
vanadium, and zinc can be present in coal. In the range of 0 to
dispute or arbitration. The iron combined in the pyritic state is
100 ppm, these monosulfides do not contribute significantly to
extracted with dilute nitric acid from the coal residue remain-
the total inorganic sulfide content.
ingaftersulfateextraction(seeNote1).Theironisdetermined
1.2 The values stated in SI units are to be regarded as
by atomic absorption techniques (see Note 2).
standard.
1.3 This standard does not purport to address all of the
NOTE 1—The sulfate extraction step also removes hydrochloric acid
safety concerns, if any, associated with its use. It is the soluble iron (nonpyritic iron) from the test specimen. A test specimen
separate from that used for the sulfate extraction could be used for the
responsibility of the user of this standard to establish appro-
nitric acid extraction of iron. In this case, both nonpyritic and pyritic iron
priate safety and health practices and determine the applica-
areextractedfromthetestspecimen.Sincethereisevidencethatforsome
bility of regulatory limitations prior to use.
coals the extraction of nonpyritic iron by nitric acids falls short of the
5,6
amount extracted by hydrochloric acid, the use of a separate test
2. Referenced Documents
specimen for the nitric acid extraction of iron with subsequent correction
2.1 ASTM Standards:
for the contribution of nonpyritic iron is not included in this test method.
2
D1193 Specification for Reagent Water NOTE 2—Round-robintestingofthecoalsamplesusedtogeneratedata
3
for the precision statement in this test method indicates that plasma
D2013 Practice for Preparing Coal Samples for Analysis
emission techniques give results equivalent to those from atomic absorp-
D3173 TestMethodforMoistureintheAnalysisSampleof
3 tion analysis for the determination of iron. However, emission analysis is
Coal and Coke
highly susceptible to interferences from other analytes that may be
D3177 Test Methods for Total Sulfur in the Analysis
dissolved during the extraction of iron. Selection of a wavelength that is
3
Sample of Coal and Coke
free from interferences and linear over the range of iron anticipated for
D3180 Practice for Calculating Coal and Coke Analyses
emissionanalysiscanrequireadetailedcompositionalanalysisofthecoal
3
from As-Determined to Different Bases mineral matter, thus limiting the practicality of this approach.
D4239 Test Methods for Sulfur in the Analysis Sample of
3.2.2.2 Alternative Method, which can be used in routine
Coal and Coke Using High-Temperature Tube Furnace
practice or when the concerned parties agree on this test
3
Combustion Methods
method. The iron originally combined in the pyritic state can
4
E832 Specification for Laboratory Filter Papers
be extracted with dilute hydrochloric acid from the ash
obtained by incinerating the coal residue remaining after
3. Summary of Test Method
sulfateextraction.Theironisdeterminedbyatomicabsorption
3.1 Sulfate Sulfur:
techniques (see Note 2).
3.1.1 Sulfate sulfur is extracted from the analysis sample
with dilute hydrochloric acid. The sulfate sulfur in the extract 4. Significance and Use
4.1 This test method provides for a separation of coal-
associated sulfur into two commonly recognized forms: pyritic
1
This test method is under the jurisdiction of ASTM Committee D05 on Coal
and Coke and is the direct responsibility of Subcommittee D05.21 on Methods of
Analysis.
5
Current edition approved September 10, 2002. Published October 2002. Origi- Edwards, A. H., Daybell, G. N., and Pringle, W. J. S., “An Investigation into
nally published as D2492–66T. Last previous edition D2492–90(1998). Methods for the Determination of Forms of Sulfur in Coal,” Fuel,Vol 37, 1958, pp.
2
Annual Book of ASTM Standards, Vol 11.01. 47–59.
3 6
Annual Book of ASTM Standards,
...