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ASTM D2492-90(1998)

(Test Method)

Standard Test Method for Forms of Sulfur in Coal

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-1998
ICS
75.160.10 - Solid fuels
Technical Committee
D05 - Coal and Coke
Drafting Committee
D05.21 - Methods of Analysis
Current Stage
Ref Project

Relations

Replaced By
ASTM D2492-02 - Standard Test Method for Forms of Sulfur in Coal
Effective Date
10-Sep-2002

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ASTM D2492-90(1998) - Standard Test Method for Forms of Sulfur in Coal
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Standards Content (Sample)

Designation: D 2492 – 90 (Reapproved 1998)
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
1
Forms of Sulfur in Coal
This standard is issued under the fixed designation D 2492; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2 Pyritic Sulfur:
3.2.1 Pyritic sulfur is calculated as a stoichiometric combi-
1.1 This test method applies to the determination of sulfate
nation with iron.
sulfur and pyritic sulfur in coal and calculates organic sulfur by
3.2.2 Methods:
difference. This test method is not applicable to coke or other
3.2.2.1 Referee Method, which can be used in cases of
carbonaceous materials. Monosulfides (pyrites and FeS are
2
dispute or arbitration. The iron combined in the pyritic state is
disulfides) of iron and elements such as cadmium, lead,
extracted with dilute nitric acid from the coal residue remain-
vanadium, and zinc can be present in coal. In the range of 0 to
ing after sulfate extraction (Note 1). The iron is determined by
100 ppm, these monosulfides do not contribute significantly to
atomic absorption techniques (Note 2).
the total inorganic sulfide content.
1.2 The values stated in SI units are to be regarded as
NOTE 1—The sulfate extraction step also removes hydrochloric acid
standard. soluble iron (nonpyritic iron) from the test specimen. A test specimen
separate from that used for the sulfate extraction could be used for the
1.3 This standard does not purport to address all of the
nitric acid extraction of iron. In this case, both nonpyritic and pyritic iron
safety concerns, if any, associated with its use. It is the
are extracted from the test specimen. Since there is evidence that for some
responsibility of the user of this standard to establish appro-
coals the extraction of nonpyritic iron by nitric acids falls short of the
priate safety and health practices and determine the applica-
5,6
amount extracted by hydrochloric acid, the use of a separate test
bility of regulatory limitations prior to use.
specimen for the nitric acid extraction of iron with subsequent correction
for the contribution of nonpyritic iron is not included in this test method.
2. Referenced Documents
NOTE 2—Round-robin testing of the coal samples used to generate data
for the precision statement in this test method indicates that plasma
2.1 ASTM Standards:
2
emission techniques give results equivalent to those from atomic absorp-
D 1193 Specification for Reagent Water
3 tion analysis for the determination of iron. However, emission analysis is
D 2013 Method of Preparing Coal Samples for Analysis
highly susceptible to interferences from other analytes that may be
D 3173 Test Method for Moisture in the Analysis Sample of
dissolved during the extraction of iron. Selection of a wavelength that is
3
Coal and Coke
free from interferences and linear over the range of iron anticipated for
D 3177 Test Methods for Total Sulfur in the Analysis
emission analysis can require a detailed compositional analysis of the coal
3
Sample of Coal and Coke mineral matter, thus limiting the practicality of this approach.
D 3180 Practice for Calculating Coal and Coke Analyses
3.2.2.2 Alternative Method, which can be used in routine
3
from As-Determined to Different Bases
practice or when the concerned parties agree on this test
D 4239 Test Methods for Sulfur in the Analysis Sample of
method. The iron originally combined in the pyritic state can
Coal and Coke Using High-Temperature Tube Furnace
be extracted with dilute hydrochloric acid from the ash
3
Combustion Methods
obtained by incinerating the coal residue remaining after
4
E 832 Specification for Laboratory Filter Papers
sulfate extraction. The iron is determined by atomic absorption
techniques (Note 2).
3. Summary of Test Method
3.1 Sulfate Sulfur: 4. Significance and Use
3.1.1 Sulfate sulfur is extracted from the analysis sample
4.1 This test method provides for a separation of coal-
with dilute hydrochloric acid. The sulfate sulfur in the extract
associated sulfur into two commonly recognized forms: pyritic
is determined gravimetrically. Sulfates are soluble in hydro-
and sulfate. Organic sulfur is calculated by difference. Results
chloric acid, but pyritic and organic sulfur are not.
obtained by the test method are used to serve a number of
interests, including the evaluation of coal preparation and
1
This test method is under the jurisdiction of ASTM Committee D-5 on Coal and processing operations designed to reduce coal sulfur levels.
Coke and is the direct responsibility of Subcommittee D05.21 on Methods of
Analysis.
5
Current edition approved March 30, 1990. Published May 1990. Origi
...

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