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目的优选QuEChERS方法中黄瓜拟除虫菊酯类农药残留净化剂的最佳组合。方法采用正交实验法,以农药加标回收率(气相色谱法)为指标,考察净化剂PSA(N-丙基乙二胺)、C18(C18烷基-硅胶)、GCB(石墨化炭黑)三因素的影响。结果重复试验表明,10 g黄瓜2 ml定容液净化剂的最佳组合是A2B1C2,即0.075 g PSA,0.025 g C18,0.050 g GCB。结论正交试验法用于优选蔬菜中农药残留检测的QuEChERS净化剂组合,既可节省试剂,又能满足检测需要。
Objective To optimize the QuEChERS method for the best combination of cucumber pyrethroid pesticide residues scavenger. Methods The orthogonal design was used to evaluate the effects of scavenger PSA (N-propyl ethylenediamine), C18 (C18 alkyl-silica gel), GCB (graphitized carbon black) The impact of three factors. Results The results of repeated experiments showed that the best combination of 10 ml cucumber 2 ml constant volume liquid scavenger was A2B1C2, ie 0.075 g PSA, 0.025 g C18 and 0.050 g GCB. Conclusion The orthogonal test method is used to optimize the combination of QuEChERS scavenger in the detection of pesticide residues in vegetables, which can save the reagents and meet the testing needs.