Abstract
A normal-phase liquid chromatographic method is described for the determination of epoxides and particulary residual ethylene oxide and propylene oxide in polyether polyols. The residual epoxides are derivatized with diethylammonium N,N-diethyldithiocarbamate into the corresponding 1-(N,N-diethyldithiocarbamoyl)-2-hydroxy-ethane and -hydroxypropane. The dithiocarbamoyl esters are extracted into chloroform and separated by normal-phase liquid chromatography. Detection is done by ultraviolet at 278 nm. Total analysis time is about 45 min. Linearity (0.1–100 ppm), detection limits (0.5 ppm), recovery from spiked samples (> 95%) and interferences have been studied.
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