“…The development of highly sensitive detectors resulted in several GC methods for the estimation of chlorophenothane and related materials in biological tissues and fluids (18)(19)(20)(21)(22)(23)(24)(25)(26)(27). Analysis of chlorinated insecticides in these biological samples by electroncapture G C requires several methods of extraction and cleanup which are time consuming (22)(23)(24), involve many pieces of glassware, suffer surface adsorption losses (18), and demand special solvent and equipment treatments before use (28). In some GC methods the procedures recommended were destructive to chlorophenothane (27).…”