<p><b>OBJECTIVE</b>To determine organochlorine
pesticide residue in 9
Chinese herbs.</p><p><b>
METHODS</b>The
organochlorine pesticides were extracted from the herbs with mixed
solvents of n-
hexane and
acetone by a solid-phase extraction cartridge Florisil.
Capillary gas chromatography was used to separate the samples.</p><p><b>RESULTS</b>Good linearities were obtained for 11
organochlorine pesticides. The average recoveries at two concentration levels ranged from 79.9% to 89.0%,and from 86.3% to 104.8%, with relative standard deviations of 1.8% to 7.1%, respectively and
detection limit of 2 g/kg. The residues of the organic
pesticides exceeded national standard in
Pogostemon cablin and
Panax notoginseng.</p><p><b>CONCLUSION</b>
Capillary gas chromatography combined with
electron capture
detection provides a practical means for detecting organic
pesticide residue in
Chinese herbal medicines, and the limits of
pesticide residues should be formulated in
Chinese pharmacopoeia.</p>