LC-MS/MS测定大米中噻虫嗪农药残留

摘要

The method for determing thiamethoxam in rice has been build utilizing LC-MS/MS technique. The pesticide residues in rice samples were extracted with acetonitrile and by ultrasonic, thiamethoxam were cleaned-up by C18 and PSA as purification sorbent, determined by LC-MS/MS. The lim its of detection were 0.1μg/kg. the average recoveries for The pesticides ranged from 93.5%to 101.2%, with the relative standard deviation(RSD)between 3.12%and 5.84%.%利用LC-MS/MS建立大米中噻虫嗪农药测定的方法。试样中噻虫嗪农药残留在超声波振荡条件下用乙腈提取，经C18和PSA进行分散固相萃取净化，经液相色谱质谱联用仪检测。方法的检出限为0.1μg/kg，回收率为93.5%~101.2%，相对标准偏差为3.12%~5.84%。