DETERMINATION OF ORGANOPHOSPHORUS AND TRIAZINE PESTICIDES IN GROUND AND DRINKING-WATER BY SOLID-PHASE EXTRACTION AND GAS-CHROMATOGRAPHY WITH NITROGEN-PHOSPHORUS OR MASS-SPECTROMETRIC DETECTION

Trace enrichement and determination of ethoprophos, fenamiphos, fenthion, isophenphos, mevinphos, monocrotophos, atrazine and simazine were performed by solid-phase extraction on XAD-2 columns and Sep-Pak C-18 cartridges, subsequent elution with an organic solvent and determination by GC with nitrogen-phosphorus detection (NPD) and mass spectrometry in the selected-ion monitoring mode (MS-SIM). Ground- and drinking water volumes of 1-2.5 1 at concentrations levels of 0.1-5 mu g/l were used for application of the method. Both adsorbents provided recoveries of 75-95%. The limits of detection were 0.08-0.60 mu g/l with NPD and 0.03-0.13 mu g/l with MS-SIM.