新型碘离子选择性电极的研究  

Study on a New Iodide Ion-selective Electrode

作　　者：赵勤[1] 陈建村[1] 章忠秀[1] 施磊[1] 袁若[2] 

机构地区：[1]南通大学化学化工学院,江苏南通226007 [2]西南大学化学化工学院,重庆400715

出　　处：《南通大学学报（自然科学版）》2008年第1期62-65,共4页Journal of Nantong University(Natural Science Edition)　

基　　金：南通大学自然科学基金项目(05Z025)

摘　　要：采用电位分析法研究了基于锰(Ⅲ)Schiff碱配合物为中性载体的新型PVC膜阴离子选择性电极.电极对碘离子具有优良的电位响应特性,并呈现反Hofmeister行为,其选择性序列为I^->>Sal^->ClO_4^->SCN^->NO_2^->NO_3^->Cl^->Br^->SO_4^(2-).电极在0.1～9.0×10^(-5)mol/L浓度范围内对I^-呈近能斯特响应,检测下限为2.0×10^(-5)mol/L,斜率为-52.6mV/pI^-.电极具有选择性高、响应快、稳定性和重现性好、制备和操作简便等优点.将电极应用于药物分析,得到令人满意的结果.Considering the manganese（Ⅲ） complex a neutral carrier, a new highly selective iodide electrode was studied by potentiometry. The electrode displays an anti-Hofmeister selectivity sequence： I- 〉〉 Sal^- 〉 ClO4^- 〉 SCN- 〉 NO2^- 〉 NO3^- 〉 Cl^- 〉 Br^- 〉 SO4^2-. The electrode exhibits a near-Nernstian potentiometric linear response range to iodide from 1.0×10^-1 to 9.0×10^-5 mol/L with a detection limit of 2.0×10^-5mol/L and a slope of -52.6 mV/pI- in pH 3.0 of phosphate buffer solutions at 20℃, This electrode is characterized by its easy preparation and operation, high selectivity and sensitivity, good stability and reproducibility, fast response and low cost. The electrode was successfully applied to medicine analysis with satisfactory results.

关 键 词：离子选择性电极 碘离子 锰(Ⅲ)Schiff碱配合物 

分 类 号：O657.15[理学—分析化学]