ASTM D3703-99
(Test Method)Standard Test Method for Peroxide Number of Aviation Turbine Fuels
Standard Test Method for Peroxide Number of Aviation Turbine Fuels
SCOPE
1.1 This test method covers the determination of the peroxide content of aviation turbine fuels.
1.2 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements, see 6.3, 6.5, 6.6, 8.2 and Annex A1.
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An American National Standard
Designation:D3703–99
Standard Test Method for
Peroxide Number of Aviation Turbine Fuels
This standard is issued under the fixed designation D 3703; 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 4. Significance and Use
1.1 This test method covers the determination of the perox- 4.1 The magnitude of the peroxide number is an indication
ide content of aviation turbine fuels. of the quantity of oxidizing constituents present. Deterioration
1.2 This standard does not purport to address all of the of turbine fuel results in the formation of peroxides and other
safety concerns, if any, associated with its use. It is the oxygen-carrying compounds. The peroxide number measures
responsibility of the user of this standard to consult and those compounds that will oxidize potassium iodide.
establish appropriate safety and health practices and deter- 4.2 The determination of the peroxide number of aviation
mine the applicability of regulatory limitations prior to use. turbine fuels is significant because of the adverse effect of
For specific precautionary statements, see 6.3, 6.6, 8.2, and peroxides upon certain elastomers in the fuel systems.
Annex A1.
5. Apparatus
2. Referenced Documents
5.1 Iodine Number Flask, 250 mL, glass-stoppered.
2.1 ASTM Standards:
2 6. Reagents
D 1193 Specification for Reagent Water
D 4057 Practice for Manual Sampling of Petroleum and 6.1 Purity of Reagents—Reagent grade chemicals shall be
used in all tests. Unless otherwise indicated, it is intended that
Petroleum Products
2.2 Other Standards: all reagents shall conform to the specifications of the Commit-
tee onAnalytical Reagents of theAmerican Chemical Society,
CRC Report No. 559 Determination of the Hydroperoxide
4 6
Potential of Jet Fuels where such specifications are available. Other grades may be
4500-C1 B. Iodometric Method I—Standard Methods for used, provided it is first ascertained that the reagent is of
sufficiently high purity to permit its use without lessening the
the Examination of Water and Wastewater
accuracy of the determination.
3. Summary of Test Method
6.2 PurityofWater—Unless otherwise indicated, references
3.1 A quantity of sample dissolved in 1,1,2-trichloro-1,2,2- to water shall be understood to mean reagent water conforming
trifluoroethane is contacted with aqueous potassium iodide to Specification D 1193, Type II.
solution. The peroxides present are reduced by the potassium 6.3 AceticAcidSolution—Mix 4 mLof concentrated hydro-
iodide. An equivalent amount of iodine is liberated, which is chloric acid (HCl, sp gr 1.19) with 996 mL of glacial acetic
titrated with sodium thiosulfate solution. The results are acid (CH COOH (Warning—Poison Corrosive. Combustible
calculated as milligrams per kilogram (ppm) of peroxide. can be fatal if swallowed. Causes severe burns. Harmful if
inhaled. See A1.2)).
6.4 1,1,2-Trichloro-1,2,2 Trifluoroethane (Warning—See
This test method is under the jurisdiction of ASTM Committee D-2 on
A1.1)
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
6.5 Potassium Dichromate Solution, Standard (0.1 N)—
D02.05 on Properties of Fuels, Petroleum Coke and Carbon Material.
ACS reagent grade. Dissolve 2.452 g of the dried potassium
Current edition approved April 10, 1999. Published June 1999. Originally
published as D 3703 – 78. Last previous edition D 3703 – 92.
Annual Book of ASTM Standards, Vol 11.01.
3 6
Annual Book of ASTM Standards, Vol 05.02. “Reagent Chemicals, American Chemical Society Specifications,” American
Available from the Coordinating Research Council, Inc., 219 Perimeter Center Chemical Society, Washington, D.C. For suggestions on the testing of reagents not
Parkway, Atlanta, GA 30346. listed by the American Chemical Society, see Analar Standards for Laboratory
Published by the American Health Assoc., the American Water Works Assoc. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
and Water Environment Federation. Available from American Public Health and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockvelle,
Publication Sales, P. O. Box 753, Waldorf, MD 20604–0753. MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D3703
dichromate (K Cr O ) in water and dilute to 500 mL in a 8. Procedure
2 2 7
volumetricflask.Thissolutionis0.1N.Asanalterative,thelab
8.1 Select the appropriate weight of sample from the fol-
may use commercially prepared solution.
lowing table:
6.6 Potassium Dichromate Solution, Standard (0.01 N)(
Estimated Peroxide Number,
Sample Mass, g
mg/kg
Warning—Avoid contact with eyes and skin and avoid breath-
0to10 50
ing of dust)—Dilute 100 mL of 0.1 N K Cr O solution with
2 2 7
11 to 30 35
water to 1000 mL in a volumetric flask.
31 to 50 25
51 to 80 10
6.7 Potassium Iodide Solution—Dissolve 120 g of potas-
81 to 100 5
sium iodide (KI) in 100 mL of water. Larger quantities of
8.2 Weigh the sample into a 250-mL iodine flask that has
solution may be prepared, provided the concentration of KI in
been flushed with nitrogen or carbon dioxide. Add 25 mL of
water is equivalent. Discharge any color from this solution by
1,1,2-trichloro-1,2,2,trifluoroethane (Warning—See A1.1).
placing 1 mL of KI solution, 50 mL of water, and 5 mL of
Pass a vigorous flow of nitrogen or carbon dioxide through the
starch solution in a 300-mL flask and blanketing with nitrogen
solvent for at least 1 min; then, without stopping the gas flow,
or carbon dioxide. If a blue color develops, add 0.005 N Na S
add 20 mLof acetic acid solution and reduce the flow of gas so
2O solution from a microburet until color just disappears.Add
that the rate is one bubble per second.Add 2 mLof KI solution
a sufficient quantity of Na S O solution, thus determined, to
2 2 3
and mix vigorously for 30 6 1 s. Set the flask aside to stand for
the main KI solution to convert all free iodine to iodide. When
5 min 63s.
properly prepared, 1 mL of KI solution should not turn blue
8.3 At the end of the reaction period, add 100 mL of water
when starch solution is added, but with starch plus one drop of
and stop the gas flow.Add 5 mLof starch solution.Titrate with
0.01 N K Cr O solution plus two drops of HCl, the blue color
2 2 7
0.005 N Na S O s
...
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