摘要
Abstract
A fast method was developed for the determination of 5 organophosphorus pesticide residues (dimethoate,chlorpyrifos,malathion,isocarbophos,fenitrothion)in paddy by neutral alumina disper-sive solid phase extraction -gas chromatography with flame photometric detector (DSPE -GC -FPD). The powdered samples were extracted with acetonitrile.The extract was purified by neutral alumina DSPE,dried by nitrogen evaporator with water bath at 70 ℃,and dissolved by acetone and determined by capillary gas chromatograph with flame photometric detector(CGC -FPD).The results showed that the 5 organophosphorus pesticide showed a good linear relationship in the range of 0.05 ~5.00 μg/mL,all of their linear correlation coefficients were 0.999 9,the limit of detection was 0.002 mg/kg,and the mini-mum quantitative limit was 0.007 mg/kg.The spiked recoveries at three levels of standard additions in paddy were between 97.7%~108.0%,and the RSDs (n =6)were between 0.8% ~5.7%.This meth-od could be used to determine 5 organophosphorus pesticide residues in paddy at the same time.关键词
分散固相萃取/气相色谱/稻谷/有机磷农药残留Key words
dispersive solid phase extraction/gas chromatography(GC)/paddy/organophosphorus pes-ticide residues分类
轻工纺织
