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目的建立果蔬中20种杀菌剂(三环唑、五氯硝基苯、嘧霉胺、乙烯菌核利、百菌清、三唑酮、戊菌唑、腐霉利、三唑醇、多效唑、稻瘟灵、抑霉唑、咯菌腈、氟硅唑、腈菌唑、肟菌酯、丙环唑、咪鲜胺、腈苯唑、苯醚甲环唑)残留量的QuEChERS-GC/MS快速测定方法。方法以生菜、毛瓜、葡萄、李子为原料,样品经乙腈提取,PSA粉50.0mg、Al2O3粉50.0mg和NH2粉30.0mg除杂净化后,用GC/MS外标法定量。结果三环唑等20种杀菌剂在0.025~0.250mg/L的质量浓度范围内线性关系良好,相关系数为0.9974~1.0000。添加水平为0.05、0.1、0.2mg/kg时,除百菌清外,其余19种杀菌剂平均回收率范围均处于83%~112%之间,相对标准偏差(RSD)小于11.0%,方法的检出限(LOD)为0.2~11.8μg/kg之间。结论本方法具有灵敏、快速、简便等特点,能满足果蔬中三环唑等20种农药杀菌剂的检测要求。
Objective To establish 20 kinds of fungicides in fruits and vegetables (tricyclazole, pentachloronitrobenzene, pyrimethanil, vinclozolin, chlorothalonil, triadimefon, penconazole, procymidone, triadimenol, QuEChERS-GC / MS for the determination of the residues of sorafenoside, pymetrozole, imazalil, fludioxonil, flusilazole, myclobutanil, trifloxystrobin, propiconazole, prochloraz, metronidazole and difenoconazole Rapid determination method. Methods The lettuce, melon, grape and plum were used as raw materials. The samples were extracted with acetonitrile. The PSA powder 50.0 mg, the Al2O3 powder 50.0 mg and the NH2 powder 30.0 mg were purified by GC / MS external standard method. Results The 20 fungicides such as tricyclazole showed a good linearity in the range of 0.025-0.250 mg / L with a correlation coefficient of 0.9974-1.0000. The average recoveries ranged from 83% to 112% and the relative standard deviations (RSDs) were less than 11.0% at the addition levels of 0.05, 0.1 and 0.2 mg / kg, respectively. The limit of detection (LOD) was between 0.2 ~ 11.8μg / kg. Conclusion The method is sensitive, rapid and simple, which can meet the testing requirements of 20 kinds of pesticide fungicides such as tricyclazole in fruits and vegetables.