Abstract
A rapid, sensitive and specific method was developed for the analysis of selected herbicides and their degradation products in surface water samples using gas chromatography/positive chemical ionization/tandem mass spectrometry (GC/PCI/MS/MS). Compounds included atrazine and its degradation products (deethylatrazine and deisopropylatrazine), simazine, alachlor and its degradation products (2-chloro-2′,6′-diethylacetanilide, 2-hydroxy-2′,6′-diethylacetanilide and 2,6-diethylaniline) and metolachlor. Daughter ion spectra for the protonated molecule of these compounds were generated and are described. The coeluting interferences present using GC/electron impact mass spectrometry in the surface water samples were eliminated by using GC/PCI/MS/MS in the neutral loss mode to detect specific daughter ions. The detection limit for most of the compounds was 200 pg, and instrument response was linear over three orders of magnitude.
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