appeared to improve the cleanup of the aqueous phase, resulting in fewer interferences in fish and cattail chromatograms. method should be useful for the determination of terbutryn and DET in aquatic systems. HT and DEHT could be determined easily in water extracts by use of LC, but results with sediment, cattail, and fish extracts were sem-iquantitative, despite the use of HC as an internal standard to correct for losses to the CH2C12 phase. ACKNOWLEDGMENTThe technical assistance of M. Pitze was much appreciated. The author also wishes to thank Ciba-Geigy Canada Ltd. for providing analytical standards of terbutryn, [14C]terbutryn and all of the degradation products. LITERATURE CITED

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Pydrin, a-cyano-3-phenoxybenzyI 2-(4-chlorophenyl)-3-methylbutyrate, a synthetic pyrethroid ester, is extracted from vegetables with acetonitrile, partitioned into petroleum ether before cleanup on a Florisil column, and analyzed by electron capture gas-liquid chromatography. Recoveries of 88-102% at 0.01 ppm, 99-102% at 0.1 ppm, and 98—104% at 1.0 ppm were obtained from fortified cabbage and lettuce samples. The method appears applicable to detection of the residues of Pydrin in the foliage of many types of crops.

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