GC Determination of 22 Organochlorine Pesticides in Olive Oil

Olive oil sample was extracted with acetonitrile, and then the extract was evaporated to near dryness by N₂-blowing.The residue was diluted with n-hexane,and purified by sulfuric acid for sulphonation. GC was applied to the determination of 22 organochlorine pesticides in the sample solution. The 22 organochlorine pesticides were separated on Inert Cap 17 chromatographic column (30 m×0.25 mm, 0.25 μm) and detected by ECD. Linear relationships between values of peak area and mass concentration of the 22 organochlorine pesticides were kept in definite ranges. Detection limits (3S/N) of the method ranged from 0.001 to 0.01 mg·kg^-1. On the base of blank sample, test for recovery was made by standard addition method; values of recovery found were in the range of 70.8%-120%, with RSDs (n=6) of determined values in the range of 0.40%-16%.