ASTM D5263-23

Standard Test Method for Determining the Relative Degree of Oxidation in Bituminous Coal by Alkali Extraction

SIGNIFICANCE AND USE
5.1 This test method is a relative measure of the degree of oxidation present in coal. It does not determine the quantitative amount of oxidized coal present. It is only intended to serve as a guide to the supplier, buyer, and user for selecting coals for metallurgical use.
Note 1: Lower rank bituminous coals are more easily extracted than higher rank coal.
SCOPE
1.1 This colorimetric test method describes the determination of the relative degree of oxidation by alkali extraction of coals that are high volatile A bituminous to low volatile bituminous in rank.  
1.2 This test cannot be sensitive to thermally oxidized coal. It is intended for coals that may be oxidized as a result of weathering.  
1.3 Units—The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 28-Feb-2023
• ICS: 73.040 - Coals
• Technical Committee: D05 - Coal and Coke
• Drafting Committee: D05.15 - Metallurgical Properties of Coal and Coke

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D5263 − 23
Standard Test Method for
Determining the Relative Degree of Oxidation in Bituminous
1
Coal by Alkali Extraction
This standard is issued under the fixed designation D5263; 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 4. Summary of Test Method
1.1 This colorimetric test method describes the determina- 4.1 Humic acids, which are present in oxidized coals, are
tion of the relative degree of oxidation by alkali extraction of extracted from the coal with sodium hydroxide solution. The
coals that are high volatile A bituminous to low volatile degree of oxidation is determined by colorimetrically measur-
bituminous in rank. ing the transmittance of the alkali extract solution at 520 nm.
The intensity of the color produced by the humic acids is a
1.2 This test cannot be sensitive to thermally oxidized coal.
function of the degree of oxidation.
It is intended for coals that may be oxidized as a result of
weathering.
5. Significance and Use
1.3 Units—The values stated in SI units are to be regarded
5.1 This test method is a relative measure of the degree of
as standard. The values given in parentheses after SI units are
oxidation present in coal. It does not determine the quantitative
provided for information only and are not considered standard.
amount of oxidized coal present. It is only intended to serve as
1.4 This standard does not purport to address all of the
a guide to the supplier, buyer, and user for selecting coals for
safety concerns, if any, associated with its use. It is the
metallurgical use.
responsibility of the user of this standard to establish appro-
NOTE 1—Lower rank bituminous coals are more easily extracted than
priate safety, health, and environmental practices and deter-
higher rank coal.
mine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accor-
6. Apparatus
dance with internationally recognized principles on standard-
6.1 Transmission Spectrophotometer—Single-beam, grating
ization established in the Decision on Principles for the
spectrophotometer having a wavelength range of 340 nm to
Development of International Standards, Guides and Recom-
900 nm.
mendations issued by the World Trade Organization Technical
6.2 Glass Test Tubes/Cuvettes, with light paths ranging from
Barriers to Trade (TBT) Committee.
10 mm to 17 mm may be used. Test tubes with an inside
2. Referenced Documents
diameter of 17 mm 6 0.3 mm are commonly used.
2
2.1 ASTM Standards:
6.3 Analytical Balance, sensitive to 0.001 g.
D1193 Specification for Reagent Water
6.4 Hot Plate, capable of bringing aqueous solutions to a
D7448 Practice for Establishing the Competence of Labora-
boil.
tories Using ASTM Procedures in the Sampling and
Analysis of Coal and Coke
6.5 Thermometer, capable of measuring up to 100 °C with a
sensitivity of 6 0.5 °C.
3. Terminology
6.6 Filter Papers, Type II, Class F and G.
3.1 There are no terms in this standard that require new or
6.7 Timer, capable of measuring 30 min to the nearest
other than dictionary definitions.
second.
1
This test method is under the jurisdiction of ASTM Committee D05 on Coal
6.8 Graduated Cylinder, 100 mL capacity.
and Coke and is the direct responsibility of Subcommittee D05.15 on Metallurgical
Properties of Coal and Coke.
6.9 Beakers, 400 mL capacity.
Current edition approved March 1, 2023. Published May 2023. Originally
approved in 1992. Last previous edition approved in 2021 as D5263 – 21. DOI:
7. Reagents
10.1520/D5263-23.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 7.1 Sodium Hydroxide Solution (certified 1N).
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
7.2 Octylphenoxypolyethoxyethanol Nonionic Surfactant—
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Wetting agent.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D5263 − 23
TABLE 1 Guidelines for General Acceptance/Rejection Levels of
9.8 Transfer the entire blank solution or test solution to a
Oxidized Coal
stack of one Type II Class F filter paper on top of one Type II
Percent Transmittance at
Glass G filter paper. The beaker shall not be rinsed onto the
Interpretation of Results
520 nm, 17 mm Light Path
filter paper. It is not signifi
...

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: D5263 − 21 D5263 − 23
Standard Test Method for
Determining the Relative Degree of Oxidation in Bituminous
1
Coal by Alkali Extraction
This standard is issued under the fixed designation D5263; 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 colorimetric test method describes the determination of the relative degree of oxidation by alkali extraction of coals that
are high volatile A bituminous to low volatile bituminous in rank.
1.2 This test cannot be sensitive to thermally oxidized coal. It is intended for coals that may be oxidized as a result of weathering.
1.3 Units—The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided
for information only and are not considered 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D1193 Specification for Reagent Water
D7448 Practice for Establishing the Competence of Laboratories Using ASTM Procedures in the Sampling and Analysis of Coal
and Coke
3. Terminology
3.1 There are no terms in this standard that require new or other than dictionary definitions.
4. Summary of Test Method
4.1 Humic acids, which are present in oxidized coals, are extracted from the coal with sodium hydroxide solution. The degree of
1
This test method is under the jurisdiction of ASTM Committee D05 on Coal and Coke and is the direct responsibility of Subcommittee D05.15 on Metallurgical Properties
of Coal and Coke.
Current edition approved Dec. 1, 2021March 1, 2023. Published January 2022May 2023. Originally approved in 1992. Last previous edition approved in 20152021 as
D5263 – 15.D5263 – 21. DOI: 10.1520/D5263-21. 10.1520/D5263-23.
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 ----------------------
D5263 − 23
oxidation is determined by colorimetrically measuring the transmittance of the alkali extract solution at 520 nm. The intensity of
the color produced by the humic acids is a function of the degree of oxidation.
5. Significance and Use
5.1 This test method is a relative measure of the degree of oxidation present in coal. It does not determine the quantitative amount
of oxidized coal present. It is only intended to serve as a guide to the supplier, buyer, and user for selecting coals for metallurgical
use.
NOTE 1—Lower rank bituminous coals are more easily extracted than higher rank coal.
TABLE 1 Guidelines for General Acceptance/Rejection Levels of
Oxidized Coal
Percent Transmittance at
Interpretation of Results
520 nm, 17 mm Light Path
> 90 Coal is not oxidized. Suitable for metallurgical
usage.
80 to 90 Coal may be oxidized. If it is being used
metallurgically, it should be monitored
closely for further changes in oxidation.
< 80 Coal is oxidized. Coal at this level may cause
coke quality and coke plant operating
problems.
6. Apparatus
6.1 Transmission Spectrophotometer—Single-beam, grating spectrophotometer having a wavelength range of 340 nm to 900 nm.
6.2 Glass Test Tubes/Cuvettes, with light paths ranging from 10 mm to 17 mm may be used. Test tubes with an inside diameter
of 17 mm 6 0.3 mm are commonly used.
6.3 Analytical Balance, sensitive to 0.001 g.
6.4 Hot Plate, capable of bringing aqueous solutions to a boil.
6.5 Thermometer, capable of measuring up to 100 °C with a sensitivity of 6 0.5 °C.
6.6 Filter Papers, Type II, Class F and G.
6.7 Ti
...