Abstract
High-performance liquid chromatography (HPLC) using a variable wavelength infrared (IR) detector provides very selective monitoring of a particular functional group. A direct injection HPLC method was developed for the determination of amyl nitrate, hexyl nitrate, and octyl nitrate cetane improver additives in diesel fuel. The method was carried out for D-2 reference fuel spiked individually with three different levels of each additive. Recoveries were good except for low levels of octyl nitrate. Limits of detection for the method were estimated for peaks with a S/N ratio of 2. For amyl nitrate and hexyl nitrate, this was about 12 ..mu..g injected or 0.05 vol % in diesel fuel. Mixtures of all three additives can be determined with this method. It represents a time saving alternative to the wef chemical method for alkyl nitrates in diesel fuels. 1 figure, 3 tables.
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