ASTM D3703 Test Method for Peroxide Number of Aviation Turbine Fuels
3. Summary of Test Method
3.1 A quantity of sample dissolved in 1,1,2-trichloro-1,2,2-trifluoroethane is contacted with aqueous potassium iodide solution. The peroxides present are reduced by the potassium iodide. An equivalent amount of iodine is liberated, which is titrated with sodium thiosulfate solution. The results are calculated as milligrams per kilogram (ppm) of peroxide.
4. Significance and Use
4.1 The magnitude of the peroxide number is an indication of the quantity of oxidizing constituents present. Deterioration of turbine fuel results in the formation of peroxides and other oxygen-carrying compounds. The peroxide number measures those compounds that will oxidize potassium iodide.
4.2 The determination of the peroxide number of aviation turbine fuels is significant because of the adverse effect of peroxides upon certain elastomers in the fuel systems.
