摘要
本文建立了超声提取,固相萃取小柱净化,GC-PFPD快速测定茶叶中12种有机磷农药残留的分析方法,重点考察并优化了茶叶中有机磷农药的提取与净化。样品经丙酮提取,PSA/活性炭固相萃取柱净化,以乙腈/甲苯混合溶液洗脱。实验结果表明各组分在0.05μg/mL～1.0μg/mL浓度范围均具有良好的线性关系,相关系数r均大于0.99,样品回收率在92.5%～109.5%之间,相对标准偏差小于11.0%,12种有机磷农药的检出限在0.005mg/kg～0.01mg/kg。
A rapid method was developed and validated for determination of 12 organophosphorus pesticide residues in tea by GC-PFPD. Tea samples were extracted by sonification with acetone, and then cleaned up by homemade PSMactivated carbon SPE cartridge, eluted with acetonitrile-toluene. Using blank tea samples spiked with mixture standard, the liner ranged from 0.05μg/mL ～ 1.0μg/mL, the recoveries were in the range from 92.5% ～109.5%, the relative standard deviation （RSDs） was no more than 11.0% and all the correlation coefficients were above 0.99. The limits of the method was about 0.005 mg/kg ～ 0.01 mg/kg.
出处
《福建分析测试》
CAS
2010年第1期78-82,共5页
Fujian Analysis & Testing
