Determination of Chlorothalonil, Propiconazole, Hexaconazole, Azoxystrobin and β-Cypermethrin in Groundwater by Gas Chromatography with Electron Capture Detector
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ABSTRACT
A Method for the determination of pesticide residues of chlorothalonil, propiconazole, hexaconazole, azoxystrobin, and beta-cypermethrin in groundwater was described in this paper. The sample was extracted by mixture of ethyl acetate and hexane (1∶1, V/V), and after dehydration with anhydrous sodium sulfate, concentration and fixing sample volume to 1.0 mL, the 5 pesticide residues were determined directly by gas chromatography with electron capture detector (GC-μECD). The detection limits of the method for chlorothalonil, propiconazole, hexaconazole, azoxystrobin, and beta-cypermethrin were 0.50 ng/L, 2.0 ng/L, 2.0 ng/L, 2.0 ng/L and 2.0 ng/L, respectively. The recoveries for all the analytes at 2.0 ng/L addition level were above 68.8 % with precision of 14.6 % RSD(n=3). The method has the advantages of high sensitivity and accuracy.
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