ASTM D3242-05

Standard Test Method for Acidity in Aviation Turbine Fuel

SIGNIFICANCE AND USE
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.
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 to 0.100 mg KOH/g.
1.2 The values stated in SI units are to be regarded as the 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: 31-Oct-2005
• ICS: 75.160.20 - Liquid fuels
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants
• Drafting Committee: D02.06 - Analysis of Liquid Fuels and Lubricants

Relations

• Replaces: ASTM D3242-01 - Standard Test Method for Acidity in Aviation Turbine Fuel
• Effective Date: 01-Nov-2005
• Replaced By: ASTM D3242-07 - Standard Test Method for Acidity in Aviation Turbine Fuel
• Effective Date: 01-Nov-2007
• Referred By: ASTM D1655-23 - Standard Specification for Aviation Turbine Fuels
• Effective Date: 01-Nov-2005
• Referred By: ASTM D4054-23 - Standard Practice for Evaluation of New Aviation Turbine Fuels and Fuel Additives
• Effective Date: 01-Nov-2005
• Referred By: ASTM D8181-19 - Standard Specification for Microemulsion Blendstock for Preparing Microemulsion Test Fuel Oils
• Effective Date: 01-Nov-2005
• Referred By: ASTM D6751-23a - Standard Specification for Biodiesel Fuel Blendstock (B100) for Middle Distillate Fuels
• Effective Date: 01-Nov-2005
• Referred By: ASTM D6469-20 - Standard Guide for Microbial Contamination in Fuels and Fuel Systems
• Effective Date: 01-Nov-2005
• Referred By: ASTM D8147-17(2023) - Standard Specification for Special-Purpose Test Fuels for Aviation Compression-Ignition Engines
• Effective Date: 01-Nov-2005
• Referred By: ASTM D7223-21 - Standard Specification for Aviation Certification Turbine Fuel
• Effective Date: 01-Nov-2005
• Referred By: ASTM D7566-22a - Standard Specification for Aviation Turbine Fuel Containing Synthesized Hydrocarbons
• Effective Date: 01-Nov-2005

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
An American National Standard
Designation:D3242–05
Designation: 354/98
Standard Test Method for
1
Acidity in Aviation Turbine Fuel
This standard is issued under the fixed designation D 3242; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* 3.1.1 acid number, n—the quantity of base, expressed in
milligrams of potassium hydroxide per gram of sample that is
1.1 This test method covers the determination of the acidity
required to titrate a sample in a specific solvent to a specific
in aviation turbine fuel in the range from 0.000 to 0.100 mg
end point.
KOH/g.
3.1.1.1 Discussion—in this test method, the solvent is a
1.2 The values stated in SI units are to be regarded as the
toluene-water-isopropanol mixture and the end point is deter-
standard. The values given in parentheses are for information
mined when a green/green brown color is obtained using the
only.
specified p-naphtholbenzein indicator solution.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Summary of Test Method
responsibility of the user of this standard to establish appro-
4.1 The sample is dissolved in a mixture of toluene and
priate safety and health practices and determine the applica-
isopropyl alcohol containing a small amount of water. The
bility of regulatory limitations prior to use.
resulting single phase solution is blanketed by a stream of
2. Referenced Documents nitrogen bubbling through it and is titrated with standard
2
alcoholicpotassiumhydroxidetotheendpointindicatedbythe
2.1 ASTM Standards:
color change (orange in acid and green in base) of the added
D 664 Test Method forAcid Number of Petroleum Products
p-naphtholbenzein solution.
by Potentiometric Titration
D 1193 Specification for Reagent Water
5. Significance and Use
3. Terminology 5.1 Some acids can be present in aviation turbine fuels due
either to the acid treatment during the refining process or to
3.1 Definitions:
naturally occurring organic acids. Significant acid contamina-
tion is not likely to be present because of the many check tests
1
This test method is under the jurisdiction of ASTM Committee D02 on
made during the various stages of refining. However, trace
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
amounts of acid can be present and are undesirable because of
D02.06 on Analysis of Lubricants.
the consequent tendencies of the fuel to corrode metals that it
Current edition approved Nov. 1, 2005. Published November 2005. Originally
contacts or to impair the water separation characteristics of the
approved in 1973. Last previous edition approved in 2001 as D 3242–01.
This test method has been approved by the sponsoring committees and accepted
aviation turbine fuel.
by the cooperating societies in accordance with established procedures.
5.2 This test method is designed to measure the levels of
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
acidity that can be present in aviation turbine fuel and is not
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on suitable for determining significant acid contamination.
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.
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D3242–05
6. Apparatus
6.1 Buret—A 25-mL buret graduated in 0.1-mL subdivi-
sions, or a 10-mL buret graduated in 0.05-mL subdivisions.
NOTE 1—An automated buret capable of delivering titrant amounts in
0.05 mL or smaller increments can be used, but the stated precision data
were obtained using manual burets only.
7. Reagents and Materials
7.1 Purity of Reagents—Reagent grade chemicals shall be
used in all tests. Unless otherwise indicated, it is intended that
all reagents shall conform to the specifications of the Commit-
tee onAnalytical Reagents of theAmerican Chemical Society,
3
where such specifications are available. Other grades may be
used, provided it is first ascertained that the reagent is of
sufficiently high purity to permit its use without lessening the
accuracy of the determination.
FIG. 1 Titration Flask
NOTE 2—Commercially available reagents may be used in place of
laboratory preparations when they are certified in accordance with 7.1.
7.2 Purity of Water— References
...