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A chemically bonded pyrrolidone substrate is used for the high performance liquid chromatographic separation of polycyclic aromatic hydrocarbons. The cyclic amide phase interacts electronically with the polycyclic aromatic hydrocarbons in

Postmortem samples from two fatalities involving parathion ingestion were examined. Parathion could not be detected in the liver tissue but a significant quantity of a related compound was detected. This was shown to be aminoparathion, a biotransformation product of parathion. The substances were extracted with hexane and analyzed by gas-liquid chromatography on a 3% OV-210 column. Thin-layer chromatography and mass spectrometery were also performed. The transformation of parathion to aminoparathion in human tissue has not been previously reported.