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Pesticides are chemical compounds used in agriculture to destroy the pests and weeds but with great potential on environment contamination. An analytical method for screening and confirming the presence of 5 pesticides (acetamiprid, cymoxanil, mefenoxam, thiacloprid, thiametoxam) was developed. LC/MS/MS was proved to be a sensitive technique for these classes of compounds (insecticides and fungicides). Five calibration curves at six levels of concentration were obtained with good correlation coefficients (0.9960-0.9990). The method detection limit (MDL) ranges between 0.4–0.75 ng/ml and the method quantification limit (MQL) ranges between 1.2–2.25 ng/ml. Two methods: a liquid-liquid extraction and a solid phase extraction were tested. The selection criteria was the recovery degree which was prove to be more adequate for liquid-liquid extraction (71-102%) than for solid phase extraction (32-87%).

Keywords: acetamiprid, cymoxanil, mefenoxam, thiacloprid, thiametoxam, LC-MS-MS, solid phase extraction, SPE