离子印迹传感器选择性检测甲基汞离子

以甲基汞离子为模板,8-巯基喹啉为荧光单体,4-乙烯基吡啶为功能单体,乙二醇二甲基丙烯酸酯为交联剂,偶氮二异丁腈为引发剂,在二甲基亚砜溶剂中,以聚偏氟乙烯(PVDF)膜为支撑介质,65℃热引发聚合得到甲基汞离子荧光印迹膜。该荧光印迹膜对甲基汞离子表现出良好的选择性,最佳吸附pH值为7.0,检出限为3.5×10-7mol/L。将其作为吸附材料,应用于河水中甲基汞离子的分离和富集,结果表明,该传感器对甲基汞离子具有良好的选择性和特异性吸附,回收率达93%～104%。

Selective Determination of Methylmercury Ion in Aqueous Media with Molecularly Imprinted Polymer Fluorescent Sensor

The molecularly imprinted polymers were synthesized with CH3Hg+ as a template,4-vinylpyridine as a functional monomer.8-Mercaptoquinoline was used as both a complex-forming agent and a fluorescence tag.The free-radical polymerization was performed within PVDF films and was initiated by 4,4′-azobisisobutyronitrile at 65 ℃ in dimethyl sulfoxide.The polymer showed a high selectivity for methylmercury ion.The optimum pH value was at 7.0.The detection limit for the method was up to 3.5×10-7mol/L.The polymer was applied in the determination of methylmercury ions in real water samples.The method showed a high selectivity against other metal ions and the recoveries for methylmercury ions were in the range of 93%-104%.