Spectrophotometric determination of saturated and alpha, beta‐unsaturated carbonyl in complex systems at a single wavelength

Abstract

The simultaneous determination of trace eoneentrations of saturated and a,ld-unsaturated earbonyl compounds in simple or complex systems at a single wavelength is described. From the wavelength of maximum absorbance of the alkaline earbonyl-2,4-dinitrophenylhydrazone determined at a preeise time-interval, the total earbonyl, percentage of saturated earbonyl, and ~g C = O/Absorbanee unit are then subsequently ealeulated from previously deternfined trilinear parameters. These parameters are calculated from the relative response of known concentrations of pure (99.6+%) saturated and a,/3unsaturated earbonyl compounds prepared by large-scale high resolution GLC. The method is applicable in simple or eomplex systems, sueh as hydrocarbon, aromatie or aliphatie, oxygenated ester, acid, aleohol or ether systems as well as kerosenes and petroleum distillates.