白菜中嘧霉胺和烯酰吗啉残留的气相色谱分析

GC Analysis of Pyrimethanil and Dimethomorph Residues in Cabbage

为探索同时检测嘧霉胺和烯酰吗啉在白菜中的残留方法，样品采用乙腈超声萃取，经硅胶柱净化，正己烷／丙酮洗脱，GC—FID检测，外标法定量，研究建立了嘧霉胺和烯酰吗啉在白菜中的气相色谱分析方法。结果表明：嘧霉胺和烯酰吗啉在0．1～5．0mg／kg范围内的回收率分别为87．4～96．2％和85．2～93．5％，相对标准偏差分别为1．58～4．62％和1．59～5．03％，检出限分别为0．003和0．048mg／kg。

To detect simultaneously the residues of pyrimethanil and dimethomorph in cabbage, samples were extracted by acetonitrile in the ultrasonic extractor, and purified on the glass column of silica gel. Subsequently, they were eluted with acetone/n -hexane, and determined by gas chromatography （GC） equipped with FID detector in the present work. Recoveries of pyrimethanil and dimethomorph were 87.4% - 96.2% and 85.2% - 93.5% at the range of 0. 1 - 5.0 mg/kg, respectively. This method was also highly reliable with a relative standard deviation of 1.58% -4. 62% for pyrimethanil and 1.59% - 5.03% for dimethomorph. The detection limit of pyrimethanil and dimethomorph was 0. 003 mg/kg and 0. 048 mg/kg, respectively.