TRACE ANALYSIS OF TRIAZINES AND ORGANOPHOSPHORUS PESTICIDES IN WATER

A method for the determination of trace levels of triazines and organo phosphorus pesticides in water is presented. The extraction method is based on a solid-phase extraction on C-18 bound silica SPE cartridges. A precolumn filled with Merck C-ls bound silica and homemade C-18 bou nd silica have been tested at a flow-rate of 3 ml/min with comparable preconcentration yields. A SIM-MS method using a N-15 labelled interna l standard has been developed for the organophosphorus pesticides. Det ection limits lower than 1 mu g/L have been obtained. Separations have been carried out on a conventional GC column OV 17 (1 m) and a capill ary column OV 17 (25 m) with a temperature program from 150 degrees C (2 min) to 300 degrees C (rate of 6 degrees C/min).