Analysis of Pesticides in Water Samples Using GC-ECD and GC-MS/MS Techniques

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Abstract
A pesticide multiresidue method for determining dichlorvos, naled. lindane, diazinon. chlorpyri-fos-methyl, dichlofluanid, chlorpyrifos, folpet, α– and β-endosulfan, endosulfan-sulphate, fen-propathrin and acrinathrin in water samples at the levels required by the EEC Drinking Waters Directive has been developed. The pesticides were selected among the most used during die last 20 years in Almeria (Spain), where there is a high agricultural activity. Solid Phase Extraction (SPE) was selected as extraction method after being compared with Liquid-Liquid Extraction (LLE). Moreover, different gas chromatographic detectors (Electron Capture Detector, ECD; Mass Spectrometer, MS; Tandem Mass Spectrometer, MS/MS) were compared. The best results of repeatability and sensitivity were obtained for ECD and MS/MS.

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