Holland P T, McGhie T K
J Assoc Off Anal Chem. 1983 Jul;66(4):1003-8.
A rapid multiresidue procedure for fruits, based on methanol extraction, is presented. Water and highly water-soluble co-extractives are removed by partitioning the pesticides into toluene. Carbon-cellulose-Florisil cleanup is performed before gas chromatography on OV-225 with electron capture detection. A wide range of pesticides can be determined to 0.1 mg/kg without concentrating the extract. Gas chromatography of the crude toluene partition using SE-30 and an alkali flame ionization detector provides confirmatory data and allows detection of some carbamates. Dichlorvos, dimethoate, and acephate are determined directly in the methanol extract by flame photometric detection. High recoveries were obtained for 4 organochlorine insecticides, 13 organophosphorus insecticides, 2 synthetic pyrethroids, two N-methyl carbamates, and 10 fungicides. The method is economical of solvents, glassware, and time, and is recommended for routine surveillance of residue levels on fruit.
介绍了一种基于甲醇萃取的水果中多种农药残留快速检测方法。通过将农药分配到甲苯中去除水和高水溶性的共萃取物。在使用电子捕获检测器的OV - 225气相色谱分析之前，进行碳 - 纤维素 - 弗罗里硅土净化。无需浓缩提取物即可测定多种农药，检测限可达0.1 mg/kg。使用SE - 30和碱火焰离子化检测器对粗甲苯萃取物进行气相色谱分析可提供确证数据，并能检测一些氨基甲酸酯类农药。敌敌畏、乐果和乙酰甲胺磷通过火焰光度检测直接在甲醇提取物中测定。该方法对4种有机氯杀虫剂、13种有机磷杀虫剂、2种合成拟除虫菊酯、2种N - 甲基氨基甲酸酯和10种杀菌剂的回收率较高。该方法在溶剂、玻璃器皿和时间方面较为经济，推荐用于水果中残留水平的常规监测。
