LC/MS/MS METHOD FOR INVESTIGATION OF FIVE USUAL PESTICIDES FROM WATER.

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%). [ABSTRACT FROM AUTHOR]