植物性食品中亚胺硫磷的气相色谱—电子捕获检测器测定法

目的建立气相色谱-电子捕获检测器（GC-ECD）测定植物性食品中亚胺硫磷含量的检测方法。方法样品经有机溶剂苯提取后，浓缩定容，利用气相色谱仪毛细管柱和ECD检测器对样品进行检测。结果该方法测定的最低检出限为0．01mg／kg，当加标剂量为0．6、1．8mg／kg时，回收率为91．7％、85．6％，相对标准偏差为2．75％。结论该方法操作简便，重现性好，比国标方法中用GC—FPD测定，灵敏度更高，峰形也更好，是检测植物性食品中亚胺硫磷的有效测定方法。

Determination of Phosmet in Plant Food by Gas Chromatography -Electron Capture Detection

Objective] To establish a new gas chromatography - electron capture detection （GC-ECD） method for quantitative detection of phosmet in plant food. Methods ] The sample was abstracted by benzene, and concentrated to a defined volume, after that it was tested and analyzed by capillary column and GC-ECD. Results] In this method, the detection limit was 0.01 mg/kg, the recovery rates were 91.7% and 85.6% , the relative standard deviations（RSDS） was 2.75 % while dosage of addition were 0.6 mg/kg and 1. 8 mg/kg. Conclusion]This method is simple and reproducible. It is more sensitive and has better peak shape compared with GC-FPD method in national standard. It＇s an effective method for determination of phosmet in plant food.