双水杨醛乙二胺中性载体的锰离子电极的研究  

Study on highly selective manganese electrode based on ethyenebis-salicyldiminate as a neutral carrier

作　　者：王秀玲[1] 柴雅琴[2] 袁若[2] 

机构地区：[1]苏州科技学院化学与生物工程学院,江苏苏州215009 [2]西南大学化学化工学院,现代分析重点实验室,重庆400715

出　　处：《化学研究与应用》2008年第10期1260-1263,共4页Chemical Research and Application

基　　金：国家自然科学基金资助项目(29705001);教育部优秀青年教师资助计划项目;重庆市自然科学基金资助项目

摘　　要：研究以双水杨醛乙二胺[BBG]为中性载体,制备了一种对锰离子(Mn2+)具有优良的电位响应特性的离子选择性电极,其选择性次序为:Mn2+>>Rb+>Al3+>Ca2+>Bi3+>Cu2+>Co2+>Fe3+>Cd2+>Ba2+>Ce3+>Cr3+>La3+>Na+。该电极在pH 3.0的NaOH-HNO3溶液体系中具有最佳的电位响应,在1.0×10-1mol/L^1.0×10-5mol/L Mn2+浓度范围呈近能斯特响应,斜率为32.0 mV/p Mn2+(25℃),检测下限为8.0×10-6mol/L。采用交流阻抗和紫外光谱分析技术研究了配合物本身的结构对电极电位响应行为的作用机理。将该电极用于实际样品的测定,获得满意的结果。A new highly selective Mn^2＋ PVC membrane electrode based on Ethyenebis - salicyldiminate [ BBG] as neutral carrier is reported,which displays selectivity sequence in the following order： Mn^2 ＋ 〉 〉 Rb^＋ 〉 Al^3＋ 〉 Ca^2＋〉 Bi^3＋〉 Cu^2＋〉 Co^2＋ 〉 Fe^3＋ 〉 Cd^2＋ 〉 Ba^2＋ 〉 Ce^3 ＋ 〉 Cr^3 ＋ 〉 La^3 ＋ 〉 Na^＋. The electrode exhibits Nemstian potential linear range to Mn^2＋ from 1.0 × 10^-1 to 1.0 × 10^-5 mol/L with a detection limit 8.0 × 10^-6 mol/L and a slope of 32.0mV/dec in pH 3.0 of NaOH - HNO3 solution at 25 ℃. The response mechanism is discussed in view of the a.c. impedance technique and the UV spectroscopy technique. These deviations result from the direct interaction between analyte ion and steric effect associated with the structure of the carrier. The electrode based [ BBG] compound was used to determine the Mn^2＋ content in sample with satisfactory results.

关 键 词：双水杨醛乙二胺 中性载体 离子选择性电极 锰离子 

分 类 号：O657.1[理学—分析化学]