【摘要】 [目的]建立同时检测吡唑醚菌酯·苯醚甲环唑在黄瓜和土壤中的残留检测方法。[方法]样品用乙腈提取,N-丙基乙二胺(PSA)净化,GC-μECD检测。[结果]在优化条件下,吡唑醚菌酯和苯醚甲环唑在0.02~1 mg/kg范围内线性关系良好,对于黄瓜和土壤的空白样品,在0.05、0.5、1 mg/kg三个添加水平下,吡唑醚菌酯在黄瓜和土壤中的回收率分别为87.8%~109.2%、89.5%~101.1%,相对标准偏差分别为2.3%~12.0%、7.7%~18.3%;苯醚甲环唑在黄瓜和土壤中的回收率分别为100.4%~107.7%、87.0%~105.2%,相对标准偏差分别为5.7%~12.4%、6.4%~10.8%。[结论]建立了适合于黄瓜及土壤中吡唑醚菌酯和苯醚甲环唑残留检测的方法,具有简便、准确等特点。更多还原

【Abstract】 [Aims] An analytical method was established to determine pyraclostrobin·difenoconazole residues in cucumber and soil. [Methods] The samples were extracted with acetonitrile, and cleaned up with primary-secondary amine(PSA). The residues of pyraclostrobin·difenoconazole were determined by gas chromatography with electronic capture detector(GC-μECD). [Results] The results showed that under the optimum condition, when the concentrations of pyraclostrobin and difenoconazole were 0.02-1 mg/kg, the linear ralation was good. When the fortification levels were 0.05, 0.5 and 1 mg/kg, the recoveries of pyraclostrobin in cucumber and soil were 87.8-109.2, 89.5-101.1%, the relative standard deviations were 2.3-12.0, 7.7-18.3%. The recoveries of difenoconazole in cucumber and soil were100.4-107.7, 87.0-105.2%, the relative standard deviations were 5.7-12.4%, 6.4-10.8%. [Conclusions] The method is simple and precise, which is suitable for determination of pyraclostrobin and difenoconazole residues in cucumber and soil.更多还原