Abstract
Parts-per-trillion levels of hydroxyatrazine (HA) have been quantitatively extracted and eluted from water by liquid-solid extraction with a graphitized carbon-black cartridge. Recoveries of HA (>80%) for this procedure are superior to those obtained when a C-18 cartridge or liquid-liquid extraction with dichloromethane are used. Quantification of HA at picogram levels was accomplished by using isotope dilution and fast atom bombardment high resolution mass spectrometry. No significant interfering spectral background occurs at the masses of interest, those of the [M+H] + ions of both the analyte and the internal standard, when the liquid matrix is 3:1 dithithreitol/dithioerythritol
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