EXAMINATION OF SURFACE-WATER SAMPLES USING GAS-CHROMATOGRAPHY ATOMIC-EMISSION DETECTION

In two separate pesticide monitoring studies, surface water samples we re collected from different locations in southern Ontario. Following c lean up, the extracts were initially analyzed for selected P-containin g pesticides using capillary column GC equipped with N/P and ECD detec tors. These extracts were subsequently analyzed by GC-AED for C-, S-, N-, P- and O-containing compounds. All target compounds identified by GC-NPD/ECD analysis were detected using the GC-AED technique. Concentr ations of the target compounds were comparable as calculated from the results of both methods of analysis. Additional non-target compounds c ontaining S and N were identified in the samples. The peaks were colla ted with respect to retention time and response. One of these compound s, benzothiazole, was found in 27 of the 34 samples.