Departamento de Química Orgânica e Inorgânica, Universidade Federal do Ceará, Rua Humberto Monte, S/N Campus do Pici, Bl. 935, CEP 60451-970 Fortaleza, CE, Brazil.
Food Chem. 2013 Dec 1;141(3):2675-81. doi: 10.1016/j.foodchem.2013.05.027. Epub 2013 May 18.
A multiresidue method based on the sample preparation by modified QuEChERS and detection by gas chromatography coupled to single quadruple mass spectrometers (GC-SQ/MS) was used for the analysis of 35 multiclass pesticides in melons (Cucumis melo inodorus) produced in Ceara-Brazil. The rates of recovery for pesticides studied were satisfactory (except for the etridiazole), ranging from 85% to 117% with a relative standard deviation (RSD) of less than 15%, at concentrations between 0.05 and 0.20 mg kg(-1). The limit of quantification (LOQ) for most compounds was below the MRLs established in Brazil. The combined relative uncertainty (Uc) and expanded uncertainty (Ue) was determined using repeatability, recovery and calibration curves data for each pesticide. Analysis of commercial melons samples revealed the presence of pesticides bifenthrin and imazalil at levels below the MRLs established by ANVISA, EU and USEPA.
采用改良的 QuEChERS 样品前处理和气相色谱-单四极杆质谱联用（GC-SQ/MS）检测方法，对巴西塞阿拉州生产的 35 种多类型瓜类（印度甜瓜 Cucumis melo inodorus）中的农药残留进行了分析。研究中农药的回收率令人满意（除了乙硫唑外），其浓度在 0.05 至 0.20 mg kg(-1) 之间，相对标准偏差（RSD）小于 15%，回收率在 85%至 117%之间。大多数化合物的定量限（LOQ）均低于巴西设定的最大残留限量（MRLs）。通过对每个农药的重复性、回收率和校准曲线数据进行综合，确定了相对不确定度（Uc）和扩展不确定度（Ue）。对商业瓜类样品的分析显示，双氟苯虫酰胺和抑霉唑的含量低于 ANVISA、欧盟和美国环保署规定的 MRLs。
