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A rapid chromatographic method for the determination of aromatic compounds in hydrocarbon mixtures in the gasoline and kerosene range utilizes a combination of silica gel separation and ultraviolet-stimulated fluorescence. The method is reproducible to within ±2% and requires a maximum of 45 minutes per determination.Olefins and other hydrocarbons do not interfere.

A flame photometer method for determining alkali and alkaline earth elements in inhibited lubricating oils is described which permits atomization of samples in organic media. This greatly reduces the time required for sample preparation and eliminates many possible causes of contamination.