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经过对样品前处理过程的研究和优化,建立了丙环唑和嘧菌酯的气相色谱分析方法。样品经乙腈水溶液提取分配后,用弗罗里硅土小柱净化,采用气相色谱(μ-ECD)测定。方法中目标物在50~2 000μg·L-1浓度范围内线性良好,相关系数分别为0.999 1和0.999 4。在5,50,200μg·kg-13个添加浓度水平下,平均加标回收率在79.2%~110.9%之间,相对标准偏差不大于15%。该方法可灵敏、简便、快速地测定玉米中丙环唑和嘧菌酯的残留。
After the research and optimization of the sample pretreatment process, the gas chromatographic analysis method of propiconazole and azoxystrobin was established. After the sample was extracted with acetonitrile aqueous solution, it was purified by Florisil cartridge and determined by gas chromatography (μ-ECD). The method showed good linearity in the concentration range of 50-2 000 μg · L-1 with the correlation coefficients of 0.999 1 and 0.999 4, respectively. The average recoveries were between 79.2% and 110.9% with the relative standard deviations of no more than 15% under the concentration of 5, 50, 200μg · kg-13. The method can be sensitive, simple and rapid determination of corn propiconazole and azoxystrobin residues.