Determination of some organophosphorus insecticides and urea herbicides from water by HPLC

The aim of this study was to develop a method for the simultaneous analysis in water samples of some organophosphorus pesticides (dichlorvos, fenitrothion, coumaphos, phoxim) and phenyl urea pesticides (monolinuron, linuron) included in the eu list of dangerous substances. For this purposes, a solid phase extraction (SPE) technique coupled to high performance liquid chromatography (HPLC) with multi-waved detection (MWD) was studied and optimised. the linearity domain, as well as the limits of detection were determined for each compounds. the limits of detection varied between 0.05 and 0.1 µg/l. the method was applied to the determination of these pesticides in surface water samples. Recoveries ranged between 74.3 and 115.3% and relative standard deviation values between 6.7 and 13.2%.