1990 Volume 15 Issue 2 Pages 231-236
A gas chromatographic determination for organochlorine pesticide residues in crops was examined with a Hall electrolytic conductivity detector (HECD). Samples were extracted with acetone and partitioned into hexane to remove water. The extracts were cleaned up chromatographically for gel permeation determined by HECD-GC on a DB-1 mega-borecolumn. HECD was sufficiently specific for organochlorine compounds and minimized the cleanup procedures for the determination of these compounds. Recovery data were obtained by fortifying seven crops (cabbage, radish, onion, potato, soybean, tea and brown rice) with 40 pesticides. Except for dichlorvos and flucythrinate, average recoveries ranged 73 to 119% at 0.5-10ppm fortification levels. The analytical method using both a gel permeation chromatographic cleanup and HECD-gas chromatographic detection is simple and applicable to residue analyses of various organochlorine pesticides.
