建立了分散液-液微萃取/气相色谱质谱（DLLME/GC-MS）联用技术分析蔬菜样品中甲胺磷、甲拌磷、甲基对硫磷、毒死蜱和乐果5种有机磷农药残留的新方法。优化后的萃取条件：10μL氯苯为萃取剂,1.0 mL丙酮为分散剂,萃取时间为3 m in。5种有...建立了分散液-液微萃取/气相色谱质谱（DLLME/GC-MS）联用技术分析蔬菜样品中甲胺磷、甲拌磷、甲基对硫磷、毒死蜱和乐果5种有机磷农药残留的新方法。优化后的萃取条件：10μL氯苯为萃取剂,1.0 mL丙酮为分散剂,萃取时间为3 m in。5种有机磷农药均具有良好的线性关系,相关系数不低于0.995,加标回收率为60%~95%,相对标准偏差为2.8%~9.1%,检出限为0.001~0.140 mg/kg。应用于蔬菜中有机磷农药残留的检测,结果满意。展开更多
A simple method was described for the preparation of quercetin-bonded silica gel using γ-aminopropyltriethoxy silane as coupling reagent.The structure of the ligand was characterizied by Fourier transform infrared sp...A simple method was described for the preparation of quercetin-bonded silica gel using γ-aminopropyltriethoxy silane as coupling reagent.The structure of the ligand was characterizied by Fourier transform infrared spectroscopy,thermal analysis and SEM etc.The stability of QBSG was studied.Some important parameters,such as pH,absorption time,the concentration of Bovine Serum Albumin(BSA) which can influence the absorption of BSA were investigated.The comparative study of absorption for SG and QBSG was also carried.The result shows that the QBSG is stable under strong acid condition.It was also found:when the adsorption pH value was 4,the concentration of the BSA was 0.267 g/L,and the adsorption time was 40 minutes,the QBSG owned the greatest capacity of 22.9 mg/g.The QBSG exhibited higher uptake capacity than SG in the same condition.展开更多
文摘建立了分散液-液微萃取/气相色谱质谱（DLLME/GC-MS）联用技术分析蔬菜样品中甲胺磷、甲拌磷、甲基对硫磷、毒死蜱和乐果5种有机磷农药残留的新方法。优化后的萃取条件：10μL氯苯为萃取剂,1.0 mL丙酮为分散剂,萃取时间为3 m in。5种有机磷农药均具有良好的线性关系,相关系数不低于0.995,加标回收率为60%~95%,相对标准偏差为2.8%~9.1%,检出限为0.001~0.140 mg/kg。应用于蔬菜中有机磷农药残留的检测,结果满意。
文摘A simple method was described for the preparation of quercetin-bonded silica gel using γ-aminopropyltriethoxy silane as coupling reagent.The structure of the ligand was characterizied by Fourier transform infrared spectroscopy,thermal analysis and SEM etc.The stability of QBSG was studied.Some important parameters,such as pH,absorption time,the concentration of Bovine Serum Albumin(BSA) which can influence the absorption of BSA were investigated.The comparative study of absorption for SG and QBSG was also carried.The result shows that the QBSG is stable under strong acid condition.It was also found:when the adsorption pH value was 4,the concentration of the BSA was 0.267 g/L,and the adsorption time was 40 minutes,the QBSG owned the greatest capacity of 22.9 mg/g.The QBSG exhibited higher uptake capacity than SG in the same condition.
