ASTM D3242-01
(Test Method)Standard Test Method for Acidity in Aviation Turbine Fuel
Standard Test Method for Acidity in Aviation Turbine Fuel
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.
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An American National Standard
Designation:D3242–01
Designation: 354/98
Standard Test Method for
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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. This test method has been approved by the
sponsoring committees and accepted by the cooperating societies in accordance with established procedures.
1. Scope resulting single phase solution is blanketed by a stream of
nitrogen bubbling through it and is titrated with standard
1.1 This test method covers the determination of the acidity
alcoholicpotassiumhydroxidetotheendpointindicatedbythe
in aviation turbine fuel in the range from 0.000 to 0.100 mg
color change (orange in acid and green in base) of the added
KOH/g.
p-naphtholbenzein solution.
1.2 The values stated in SI units are to be regarded as the
standard.
5. Significance and Use
1.3 This standard does not purport to address all of the
5.1 Some acids can be present in aviation turbine fuels due
safety concerns, if any, associated with its use. It is the
either to the acid treatment during the refining process or to
responsibility of the user of this standard to establish appro-
naturally occurring organic acids. Significant acid contamina-
priate safety and health practices and determine the applica-
tion is not likely to be present because of the many check tests
bility of regulatory limitations prior to use.
made during the various stages of refining. However, trace
2. Referenced Documents amounts of acid can be present and are undesirable because of
the consequent tendencies of the fuel to corrode metals that it
2.1 ASTM Standards:
contacts or to impair the water separation characteristics of the
D 664 Test Method forAcid Number of Petroleum Products
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aviation turbine fuel.
by Potentiometric Titration
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5.2 This test method is designed to measure the levels of
D 1193 Specification for Reagent Water
acidity that can be present in aviation turbine fuel and is not
3. Terminology
suitable for determining significant acid contamination.
3.1 Definitions:
6. Apparatus
3.1.1 acid number, n—the quantity of base, expressed in
6.1 Buret—A 25-mL buret graduated in 0.1-mL subdivi-
milligrams of potassium hydroxide per gram of sample that is
sions, or a 10-mL buret graduated in 0.05-mL subdivisions.
required to titrate a sample in a specific solvent to a specific
end point.
NOTE 1—An automated buret capable of delivering titrant amounts in
3.1.1.1 Discussion—in this test method, the solvent is a
0.05 mL or smaller increments can be used, but the stated precision data
were obtained using manual burets only.
toluene-water-isopropanol mixture and the end point is deter-
mined when a green/green brown color is obtained using the
7. Reagents and Materials
specified p-naphtholbenzein indicator solution.
7.1 Purity of Reagents—Reagent grade chemicals shall be
4. Summary of Test Method
used in all tests. Unless otherwise indicated, it is intended that
all reagents shall conform to the specifications of the Commit-
4.1 The sample is dissolved in a mixture of toluene and
tee onAnalytical Reagents of theAmerican Chemical Society,
isopropyl alcohol containing a small amount of water. The
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where such specifications are available. Other grades may be
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This test method is under the jurisdiction of ASTM Committee D02 on
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Petroleum Products and Lubricants and is the direct responsibility of Subcommittee Reagent Chemicals, American Chemical Society Specifications, American
D02.06 on Analysis of Lubricants. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
Current edition approved August 10, 2001. Published September 2001. Origi- listed by the American Chemical Society, see Analar Standards for Laboratory
nally published as D 3242 – 73 T. Last previous edition D 3242 – 98. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
2
Annual Book of ASTM Standards, Vol 05.01. and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
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Annual Book of ASTM Standards, Vol 11.01. MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D3242–01
W 1000
used, provided it is first ascertained that the reagent is of
p
Normality 5 3 (1)
204.23 V2V
sufficiently high purity to permit its use without lessening the b
accuracy of the determination.
where:
NOTE 2—Commercially available reagent
...
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