Determination of Prochloraz in Two Kinds of Tropical Fruits by GC-MS

Residues of prochloraz in Qiongzhong Green Orange and guava were determined by GC–MS with florisil column purification. Pesticide was extracted from samples with acetonitrile, followed by clean up in a chromatographic column packed with florisil, and eluted with acetonitrile and toluene (99∶l, by vol). Recovery was determined by adding prochloraz with 0.2, 0.4 and 1.0 mg/kg to Qiongzhong Green Orange and guava samples. Recoveries ranged from 84.95% to 103.78% and from 83.82% to 100.41%, with coefficients of variation from 5.6% to 8.9% and from 1.9% to 9.0%. The detection limit of method is 0.2 mg·kg-1.