DETERMINATION OF CHLORINATED PESTICIDES BY PACKED-COLUMN SUPERCRITICAL-FLUID CHROMATOGRAPHY ELECTRON-CAPTURE DETECTOR

An electron-capture detector (ECD) was used in packed column supercrit ical fluid chromatography (SFC) for the selective determination of chl orinated pesticides. The separation of chlorinated pesticides was cond ucted on an ODS-silica gel column using carbon dioxide as a mobile pha se without a modifier. The detection temperature of ECD was set to 325 -degrees-C according to the peak sensitivities. The SFC/ECD system was applied to the determination of gamma-BHC and p, p'-DDD in carrots ex tracted by supercritical fluid extraction. The recoveries of gamma-BHC and p, p'-DDD obtained by the SFC/ECD were 93.9 and 93.2%, respective ly. (C) 1994 Academic Press, Inc.