摘要
粉碎好的玉米使用乙腈超声提取,再经碳十八和活性碳氨基串联固相萃取柱净化,采用GC-EI-MS的选择离子监测(SIM)方式和外标法定量方法,同时分析测定了玉米中的50种农药残留量。该方法回收率在62.8%- 119.2%之间,相对标准偏差小于12.1%,50种农药的检出限(LOD)最小为0.8μg/kg,最高为7.2μg/kg。该方法快速、灵敏、准确,各项技术指标满足国内外农药残留检测的要求,能够应用于玉米试样中痕量农药残留的分析。
This paper described a method for the determination of 50 pesticide residues in corn by Gas Chromatography/Mass Spectrometry. Pesticides were extracted from corn with acetonitrile in an ultrasonic bath and cleaned up on the SPE column, then were determined by gas chromatography with electron ionization mass spectrometric detection in the selected ion monitoring mode. When the spike level were 5.0 μg/kg -20.0 μg/kg, the recoveries ranged from 62.8% to 119.2% with the relative standard deviation of 0.7% to 12.1% for the different pesticides. The detection Limit of the method was 0.8 - 7.2 μg/kg. The developed method was linear over the range assayed, 0. 005 mg/kg - 2.0 mg/kg, with determination coefficients 〉 0. 992.
出处
《现代科学仪器》
2007年第5期84-88,共5页
Modern Scientific Instruments
