MASS-SPECTROMETRIC DETECTION AND IDENTIFICATION OF POLAR PESTICIDES AND THEIR DEGRADATION PRODUCTS A COMPARISON OF DIFFERENT IONIZATION METHODS

Due to increasing use of polar pesticides, they are found together wit h their degradation products in ground- and surface waters serving for drinking water treatment. The triazine derivatives acetamido-atrazine , ametryne, atrazine, cyanazine, deethylatrazine, deethyldeisopropyl-h ydroxyatrazine, deethyl-hydroxyatrazine, deisopropyl-atrazin, deisopro pyl-hydroxyatrazine, desmetryn, hydroxyatrazine, prometryne, propazine , simazine, terbumeton, terbutryne and terbutylazine, and the pesticid es 2,4-D, dichlorprop, isoproturon, diuron, me tolachlor, glyphosate, metsulfuronmethyl and dalapon, all of them belonging to this type of p esticides, have been studied. For determination of triazine derivative s UV detection by means of diode array detector (DAD) as well as mass spectrometric (MS) detection coupled by thermospray interface (TSP) ha ve been used successfully after liquid chromatoraphic (LC) separation. Interfaces like thermospray (TSP), electrospray (ESP) and atmospheric pressure chemical ionisation (APCI) were examined with regard to thei r suitability for substance-specific detection of polar pesticides by flow injection analysis (FIA) with MS- and tandem mass spectroscopic d etection (MS/MS) without preceding LC separation. Optimised detection conditions for these pesticides using FIA are presented, and solutions for occurring problems are offered.