气相色谱电子捕获法检测地下水中5种残留农药
Determination of Chlorothalonil, Propiconazole, Hexaconazole, Azoxystrobin and β-Cypermethrin in Groundwater by Gas Chromatography with Electron Capture Detector
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摘要: 用气相色谱-电子捕获法(GC-ECD)检测地下水中百菌清、丙环唑、己唑醇、嘧菌酯和高效氯氰菊酯。样品用乙酸乙酯-正己烷(体积比1∶1)液-液提取,提取液经无水硫酸钠去水后、浓缩、并定容至1.0 mL,最后用微池-电子捕获检测器(GC-μECD)进行检测。方法准确度、灵敏度高。2.0 ng/L添加水平所有待测物回收率≥68.8%,相对标准偏差(RSD, n=3)≤14.6%,百菌清、己唑醇、丙环唑、高效氯氰菊酯和嘧菌酯的方法检测限分别为0.50 ng/L、2.0 ng/L、2.0 ng/L、2.0 ng/L和2.0 ng/L。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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