ASTM D3242-23
(Test Method)Standard Test Method for Acidity in Aviation Turbine Fuel
Standard Test Method for Acidity in Aviation Turbine Fuel
SIGNIFICANCE AND USE
5.1 Some acids can be present in aviation turbine fuels due either to the acid treatment during the refining process or to naturally occurring organic acids. Significant acid contamination is not likely to be present because of the many check tests made during the various stages of refining. However, trace amounts of acid can be present and are undesirable because of the consequent tendencies of the fuel to corrode metals that it contacts or to impair the water separation characteristics of the aviation turbine fuel.
5.2 This test method is designed to measure the levels of acidity that can be present in aviation turbine fuel and is not suitable for determining significant acid contamination.
SCOPE
1.1 This test method covers the determination of the acidity in aviation turbine fuel in the range from 0.000 mg/g to 0.100 mg/g KOH.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 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.
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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: D3242 − 23
Designation: 354/09
Standard Test Method for
1,2
Acidity in Aviation Turbine Fuel
This standard is issued under the fixed designation D3242; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* 3. Terminology
1.1 This test method covers the determination of the acidity 3.1 Definitions:
in aviation turbine fuel in the range from 0.000 mg ⁄g to 3.1.1 For definitions of terms used in this test method, refer
0.100 mg ⁄g KOH. to Terminology D4175.
3.1.2 acid number, n—the quantity of a specified base,
1.2 The values stated in SI units are to be regarded as
expressed in milligrams of potassium hydroxide per gram of
standard. No other units of measurement are included in this
sample, required to titrate a sample in a specified solvent to a
standard.
specified endpoint using a specified detection system.
1.3 This standard does not purport to address all of the
3.1.2.1 Discussion—in this test method, the solvent is a
safety concerns, if any, associated with its use. It is the
toluene-water-isopropanol mixture and the end point is deter-
responsibility of the user of this standard to establish appro-
mined when a green/green brown color is obtained using the
priate safety, health, and environmental practices and deter-
specified p-naphtholbenzein indicator solution.
mine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accor-
4. Summary of Test Method
dance with internationally recognized principles on standard-
4.1 The sample is dissolved in a mixture of toluene and
ization established in the Decision on Principles for the
isopropyl alcohol containing a small amount of water. The
Development of International Standards, Guides and Recom-
resulting single phase solution is blanketed by a stream of
mendations issued by the World Trade Organization Technical
nitrogen bubbling through it and is titrated with standard
Barriers to Trade (TBT) Committee.
alcoholic potassium hydroxide to the end point indicated by the
color change (orange in acid and green in base) of the added
2. Referenced Documents
p-naphtholbenzein solution.
3
2.1 ASTM Standards:
D664 Test Method for Acid Number of Petroleum Products
5. Significance and Use
by Potentiometric Titration
5.1 Some acids can be present in aviation turbine fuels due
D1193 Specification for Reagent Water
either to the acid treatment during the refining process or to
D4175 Terminology Relating to Petroleum Products, Liquid
naturally occurring organic acids. Significant acid contamina-
Fuels, and Lubricants
tion is not likely to be present because of the many check tests
made during the various stages of refining. However, trace
1
This test method is under the jurisdiction of ASTM International Committee
amounts of acid can be present and are undesirable because of
D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct
the consequent tendencies of the fuel to corrode metals that it
responsibility of ASTM Subcommittee D02.06 on Analysis of Liquid Fuels and
contacts or to impair the water separation characteristics of the
Lubricants. The technically equivalent standard as referenced is under the jurisdic-
tion of the Energy Institute Subcommittee SC-B-11.
aviation turbine fuel.
Current edition approved Nov. 1, 2023. Published November 2023. Originally
5.2 This test method is designed to measure the levels of
approved in 1973. Last previous edition approved in 2017 as D3242 – 11 (2017).
DOI: 10.1520/D3242-23.
acidity that can be present in aviation turbine fuel and is not
2
This test method has been developed through the cooperative effort between
suitable for determining significant acid contamination.
ASTM and the Energy Institute, London. ASTM and IP standards were approved by
ASTM and EI technical committees as being technically equivalent but that does not
6. Apparatus
imply both standards are identical.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.1 Buret—A 25 mL buret graduated in 0.1 mL
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
subdivisions, or a 10 mL buret graduated in 0.05 mL subdivi-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. sions.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM I
...
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: D3242 − 11 (Reapproved 2017) D3242 − 23
Designation: 354/98354/09
Standard Test Method for
1,2
Acidity in Aviation Turbine Fuel
This standard is issued under the fixed designation D3242; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope Scope*
1.1 This test method covers the determination of the acidity in aviation turbine fuel in the range from 0.000 mg ⁄g to 0.100 mg ⁄g
KOH.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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 healthsafety, health, and environmental practices and determine
the applicability of regulatory limitations prior to use.
1.4 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
3
2.1 ASTM Standards:
D664 Test Method for Acid Number of Petroleum Products by Potentiometric Titration
D1193 Specification for Reagent Water
D4175 Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this test method, refer to Terminology D4175.
3.1.2 acid number, n—the quantity of a specified base, expressed in milligrams of potassium hydroxide per gram of sample,
required to titrate a sample in a specified solvent to a specified endpoint using a specified detection system.
1
This test method is under the jurisdiction of ASTM International Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility
of ASTM Subcommittee D02.06 on Analysis of Liquid Fuels and Lubricants. The technically equivalent standard as referenced is under the jurisdiction of the Energy Institute
Subcommittee SC-B-11.
Current edition approved May 1, 2017Nov. 1, 2023. Published June 2017November 2023. Originally approved in 1973. Last previous edition approved in 20112017 as
D3242 – 11.D3242 – 11 (2017). DOI: 10.1520/D3242-11R17. 10.1520/D3242-23.
This test method has been approved by the sponsoring committees and accepted by the cooperating societies in accordance with established procedures.
2
This test method has been developed through the cooperative effort between ASTM and the Energy Institute, London. ASTM and IP standards were approved by ASTM
and EI technical committees as being technically equivalent but that does not imply both standards are identical.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D3242 − 23
3.1.2.1 Discussion—
in this test method, the solvent is a toluene-water-isopropanol mixture and the end point is determined when a green/green brown
color is obtained using the specified p-naphtholbenzein indicator solution.
4. Summary of Test Method
4.1 The sample is dissolved in a mixture of toluene and isopropyl alcohol containing a small amount of water. The resulting single
phase solution is blanketed by a stream of nitrogen bubbling through it and is titrated with standard alcoholic potassium hydroxide
to the end point indicated by the color change (orange in acid and green in base) of the added p-naphtholbenzein solution.
5. Significance and Use
5.1 Some acids can be present in aviation turbine fuels due either to the acid treatment during the refining process or to naturally
occurring organic acids. Significant acid contamination is not likely to be present because of the many check tests made during
the various stages of refi
...
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