【摘要】 利用乙腈直接萃取后浓缩进样,用双柱双FPD气相色谱同时定性、定量测定27种有机磷农药残留。结果表明,27种农药在6种蔬菜、水果中3个浓度添加水平,平均回收率为70%～120%,变异系数小于20%;在HP-1和HP-17柱上最低检出限分别为:0.0104～0.8625mg·kg-1和0.0065～0.1725mg·kg-1。在两个柱上,辛硫磷的方法检出限较低,分别为0.8625mg·kg-1和0.1725mg·kg-1。一个蔬菜、水果样品经一次处理,在1.0h内即可完成农药残留的检测,确定有无超标和违禁农药残留。更多还原

【Abstract】 A simple and fast method was developed capable of determination of 27 organophosphorus pesticides. The method used acetonitrile to extract the residues, then directly concentrate and inject into instrument for qualification and quantification. The residues were undergoing simultaneous identification and quantitation using gas chromatography with dual- column and dual- flame photometric detector (FPD). Averaged recoveries gained of three spiked levels with 27 organophosphorus pesticides were found to be 70% ～ 120% in 6 vegetables and fruits. The relative standard deviation (RSD) was less than 20% . The minimum detection limits of the present method were in ranges of 0.010 4～ 0.862 5 mg· kg- 1, 0.006 5～ 0.172 5 mg· kg- 1 for HP- 1 column and HP- 17 column, respectively. In addition, the minimum detection limit for phoxim was higher in double columns with 0.862 5 mg· kg- 1 and 0.172 5 mg· kg- 1, respectively.更多还原