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     "abstract": "This report describes a method for the determination of  atrazine, desethylatrazine, deisopropylatrazine, didealkylatrazine, and  hydroxyatrazine from soil pore waters by use of solid-phase extractionfollowed by chemical derivatization and gas chromatography/mass  spectrometry. The analytes are isolated from the pore-water matrix byextraction onto a graphitized carbon-black cartridge. The cartridge is  dried under vacuum, and adsorbed analytes are removed by elution with  ethyl acetate followed by dichloromethane/methanol (7:3, volume/volume).  Water is removed from the ethyl acetate fraction on an anhydrous sodium  sulfate column. The combined fractions are solvent exchanged into  acetonitrile, evaporated by use of a nitrogen stream, and derivatized by  use of N- methyl-N-(tert-butyldimethylsilyl)- trifluoroacetamide. The  derivatized extracts are analyzed by capillary-column gaschromatography/electron-impact mass spectrometry in the scan mode.  Estimated method detection limits range from 0.03 to 0.07 micrograms per  liter. The mean recoveries of all analytes and surrogates determined at  0.74 to 0.82 micrograms per liter in reagent water in soil pore water  were 94 percent and 98 percent, respectively. The mean recoveries of all  analytes and surrogates determined at 7.4 to 8.2 micrograms per liter in  reagent water and in soil pore water were 96 percent and 97 percent,respectively. Recoveries were 90 percent or higher, regardless of analyte  concentration or matrix composition, for all compounds excepthydroxyatrazine, whose recoveries were slightly lower (77 percent) at the  low concentration.",
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   "qid": "Q79827"
 }

}

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