Standard Test Method for
Acidity in Aviation Turbine Fuel1
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.
1.1 This test method covers the determination of the acidity
in aviation turbine fuel in the range from 0.000 to 0.100 mg
1.2 The values stated in SI units are to be regarded as the
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.
2. Referenced Documents
2.1 ASTM Standards:
D 664 Test Method for Acid Number of Petroleum Products
by Potentiometric Titration2
D 1193 Specification for Reagent Water3
3.1.1 acid number, n—the quantity of base, expressed in
milligrams of potassium hydroxide per gram of sample that is
required to titrate a sample in a specific solvent to a specific
22.214.171.124 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
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