Fe3O4@SiO2 microspheres were prepared by sol-gel method and then magnetic silica colloids with surface modification by γ-methacryloxypropyl trimethoxy silane were synthesized.This composite material was prepared by dispersion polymerization of MAA and EGDMA in the presence of Fe3O4@SiO2@MPS microspheres with the surface containing abundant reactive double bonds.The resultant sorbent materials were applied to separation and concentration of carbaryl, isoprocarb and carbofuran.The eluent type, volume, adsorption time, acidity and ionic strength were investigated, in detail.Under the optimized conditions, a simple and sensitive SPME-HPLCmethod for the determination of carbaryl, isoprocarb and carbofuran in orange juice had been developed.%通过溶胶-凝胶法在四氧化三铁纳米粒子表面包覆二氧化硅,其后通过3-(甲基丙烯酰氧)丙基三甲氧基硅烷(MPS)在SiO2表面接枝双键,加热条件下与单体甲基丙烯酸(MAA)和交联剂乙二醇二甲基丙烯酸酯(EGDMA)发生聚合反应.最终得到磁性聚合物微球,并将其应用于橙汁样品中杀虫剂类农药的分离富集,优化了萃取条件如洗脱剂种类和体积、吸附时间、酸度、离子强度等,建立橙汁样品中甲萘威、异丙威、克百威的固相微萃取-高效液相色谱(SPME-HPLC)分离分析方法,并进行了方法考察和橙汁中的农药残留分析.
展开▼
