Development GC-MS method determination

of organochlorid pesticides in olive oil


H. Garoiaz, M. Berrabah, A. Elidrissi, B. Hammouti*

University Mohamed Premier, Faculty des sciences, Departement of Chemistry Oujda 60000 Morocco

* Corresponding author: E-mail:

Received: 02 September 2011; revised version accepted: 20 November 2011



     A method for the multiresidue analysis of olive oil samples for pesticides is proposed: residual pesticides are extracted from oil, using an acetonitrile/dichloromethane mixture and extracts have being cleaned by C18 and florisil cartridges. Organochlorine pesticides were determined by gas chromatograph interfaced with a mass spectrometer (GC-MS) the protocol was applied by the quantitative analysis of extracts and identification of degradation products; hence the recovery was determined for each molecule in solvent, pesticides recoveries from M3OCS mixture with 0.1 ppm concentrations are ranged from 74.8 to 104.1 ?. The proposed method proved good sensitivity and precision (RSD<10%). These features are clearly shown in the repeated results in the mixture M3OCS used, in the sample spiked with the mixture. The applicability of this method was tested on olive oil samples in the region of the east of Morocco.


Keywords: Pesticides; Olive oil; Florisil; C18; Gas chromatography; GC-MS.

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