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- W2002061897 abstract "Mass spectra of 39 carbamate, triazine, phenylurea and organophosphorus polar pesticides were obtained by liquid chromatography—mass spectrometry with a thermospray interface. The analytes generated [M + H]+ or [M + NH4]+ as the base peak with methanol−0.1 M ammonium acetate as the mobile phase in the discharge positive-ion mode. Chlorophenols showed much better sensitivity in the negative-ion mode; their spectra were dominated by the deprotonated molecular ion. Trace enrichment of these pesticides on a 10 mm × 3.0 mm I.D. precolumn packed with C18-bonded silica was coupled on-line with reversed-phase column liquid chromatography—thermospray mass spectrometry (LC-TSP-MS). The LC separation was carried out on a 250 × 4.6 mm I.D. C18-bonded silica column using a linear methanol—aqueous ammonium acetate gradient [10:90 to 90:10 (v/v) in 45 min]. When optimized TSP-MS conditions and 50-ml water samples were used, the detection limits for the pollutants tested typically were in the 2–90 ng/l range with time-scheduled selected-ion monitoring; the repeatability was good and the LC-TSP-MS system was robust. Several surface and drinking water samples were analysed and low levels of simazine, atrazine, isoproturon and diuron were detected." @default.
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- W2002061897 date "1993-09-01" @default.
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- W2002061897 title "On-line low-level screening of polar pesticides in drinking and surface waters by liquid chromatography—thermospray mass spectrometry" @default.
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- W2002061897 doi "https://doi.org/10.1016/0021-9673(93)83331-l" @default.
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