Continuous Flow Determination of Organophosphorus Pesticides Using Solid Phase Extraction Coupled On-Line with High Performance Liquid Chromatography

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Abstract
A XAD-2 resin is used for trace enrichment of three organophosphorus pesticides (diazinon, azinphosmethyl and fenthion) on an unsegmented-flow solid-phase preconcentration system, coupled on-line with a high performance liquid chromatograph with UV detection at 220 nm. The influence of different parameters (e.g. pesticides water concentrations, water pH, precolumn characteristics, preconcentration and elution times and solvent flow rates) on the retention and recovery of the pesticides was studied. Recoveries higher than 95%, were obtained for the three pesticides, except for diazinon at sample volumes higher than 500 ml. Calibration graphs are linear in the range of 0.07–2 mg 1−1 for each pesticide under standard conditions, although concentrations down to 5 μg 1−1 can be measured. The method has been successfully applied to spiked river water samples.

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