气相色谱法测定大米中7种有机磷农药

Determination of 7 organophosphorus pesticides in rice by gas chromatography

中文关键词:  有机磷农药残留  气相色谱法  大米

英文关键词:organophosphorus pesticide residues  gas chromatography  rice

中文摘要:

      目的 建立了一种气相色谱快速检测大米中7种有机磷农药残留的分析方法。方法 试样用乙腈和水提取, 提取液经净化处理去除杂质, 使用带火焰光度检测器的气相色谱仪检测, 根据色谱峰的保留时间定性, 外标法定量。结果 在26 min内完成大米中7种有机磷农药残留的测定, 7种有机磷农药在0.2、0.5和1.0 μg/mL添加水平的回收率为81.6%~111.5%, 相对标准偏差为1.27%~3.22% (n=6), 方法检测限为0.015~0.050 mg/kg。结论 该方法与国标方法相比样品处理更加简捷, 且结果具有良好的稳定性、准确度和灵敏度, 适合于大米中有机磷类药物残留的监控和筛查工作。

英文摘要:

      Objective To establish a method for rapid determination of 7 organophosphorus pesticide residues in rice by gas chromatography. Methods The samples were extracted by acetonitrile and water, and the extract was purified to remove impurities, and detected by gas chromatograph with flame photometric detector detector. Results The determination of 7 organophosphorus pesticide residues in rice was completed within 26 min. The recovery rate of 7 organophosphorus pesticides at 0.2, 0.5 and 1.0 μg/mL were 81.6%?111.5%, the relative standard deviation were 1.27%?3.22% (n=6), and the limit of detection were 0.015?0.050 mg/kg. Conclusion Compared with the national standard method, this method is simpler, more stable, more accurate and more sensitive. It is suitable for the monitoring and screening of organophosphorus residues in rice.