ASTM D6447 Test Method for Hydroperoxide Number of Aviation Turbine Fuels
ASTM D6447 Standard Test Method for Hydroperoxide Number of Aviation Turbine Fuels by Voltammetric Analysis
3. Summary of Test Method
3.1 A quantity of sample is contacted with aqueous potassium iodide solution in the presence of acid. The hydroperoxides present are reduced by the potassium iodide. An equivalent amount of iodine is liberated, which is quantified by voltammetric analysis. The results are calculated and reported as millimoles (mmole) of hydroperoxide per litre of sample.
4. Significance and Use
4.1 This test method is functionally equivalent to Test Method D3703, which uses an ozone depleting substance, (1,1,2-trichloro-1,2,2-trifluoroethane). The use of an ozone depleting substance precludes U. S. military bases from utilizing Test Method D3703. This test method and Test Method D3703 measure the same peroxide species (primarily hydroperoxides) in aviation fuels.
4.2 The magnitude of the hydroperoxide number is an indication of the quantity of oxidizing constituents present. Deterioration of fuel results in the formation of hydroperoxides and other oxygen-carrying compounds. The hydroperoxide number measures those compounds that will oxidize potassium iodide.
4.3 The determination of the hydroperoxide number of fuels is significant because of the adverse effect of hydroperoxides upon certain elastomers in the fuel systems.
