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

An electron-capture detector (ECD) was used in packed column supercritical fluid chromatography (SFC) for the selective determination of chlorinated pesticides. The separation of chlorinated pesticides was conducted on an ODS-silica gel column using carbon dioxide as a mobile phase 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 extracted by supercritical fluid extraction. The recoveries of gamma-BHC and p, p'-DDD obtained by the SFC/ECD were 93.9 and 93.2%, respectively. (C) 1994 Academic Press, Inc.