A GC-MS/MS method with low solvent consumption and easy operation was developed to simultaneously determine ten new-generation pesticides, namely fenobucarb, acetochlor, pretilachlor, fipronil, trifloxystrobin, fluazifop-p-butyl, isoprothiolane, tebuconazole, cypermethrin and difenoconazole in leafy vegetables. Influences from ultrasonic sample extraction and the clean-up steps to reduce matrix effects were investigated. Under suitable conditions, good linearity (deviation of back calculated concentration from true concentration lower than 20%) was achieved for all studied pesticides; the method detection limits (MDLs) ranged from 1.4 to 3.6 ng g⁻¹ wet weight. For mustard green and green onion the method yielded good recoveries at two spiking levels (20¹ and 100 ng g⁻¹) ranging from 80% to 111% (n = 5). The repeatability, expressed as relative standard deviation (RSD), was lower than 11% (n = 5). The method was successfully used to quantify pesticide residues in 207 vegetable samples (green onions, mustard greens, and lettuce) collected in Thua Thien Hue and Quang Binh Provinces, Central Vietnam. The insecticide cypermethrin was found at critical levels in 98% of the vegetable samples. Green onions had high pesticide residues with a significant number of samples containing pesticides at concentrations exceeding the maximum residue levels (MRLs).

建立了一种溶剂消耗低且易于操作的GC-MS / MS方法，可同时测定十种新一代农药，分别是非诺威威，乙草胺，丙草胺，氟虫腈，三氟羟雌黄酮，氟他莫普-对-丁基，异丙硫烷，戊丁康唑，氯氰菊酯和联苯二酚叶菜类蔬菜。研究了超声样品提取和净化步骤对降低基质效应的影响。在适当的条件下，所有研究的农药均具有良好的线性关系（实际浓度与实际浓度相差不到20％）。方法检测限（MDL）的湿重为1.4至3.6 ng g ^-1。对于芥末和葱，该方法在两个加标水平（20 ¹和100 ng g ^-1）下均具有良好的回收率。）范围从80％到111％（n  = 5）。以相对标准偏差（RSD）表示的可重复性低于11％（n  = 5）。该方法已成功用于量化在越南中部Thua Thien Hue和Quang Binh省收集的207种蔬菜样品（大葱，芥菜和生菜）中的农药残留。在98％的蔬菜样品中发现了高含量的杀虫剂氯氰菊酯。大葱中的农药残留量很高，大量样品中的农药浓度超过了最大残留量（MRL）。