EXPLANATION
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. The determination of hydroperoxide number is significant because of the adverse effect of hydroperoxides upon certain elastomers in the fuel systems.
This test method and Test Method ASTM D3703 measure the same peroxide species, primarily the hydroperoxides in aviation fuels. The difference is that this test method does not use the ozone depleting substance 1,1,2-trichloro-1,2,2-trifluoro-ethane used in Test Method ASTM D3703. This test method may also be applicable to any water-insoluble, organic fluid, particularly diesel fuels, gasolines, and kerosenes.
TEST SUMMARY
A quantity of sample is contacted with aqueous potassium iodide (KI) solution in the presence of acid. The hydroperoxides present are reduced by KI liberating an equivalent amount of iodine, which is quantified by voltammetric analysis.
TEST PRECISION
Where X is the mean value.
No bias statement is being made due to the lack of a suitable reference material.