以双安息香缩三乙四胺为中性载体的铈离子电极的研究  

Study on Highly Selective Ce^(3+) Electrode Based on Bis-bebzoin-semitriethy lenetetraamine Complex as a Neutral Carrier

作　　者：王秀玲[1] 袁若[2] 柴雅琴[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：《西南大学学报（自然科学版）》2008年第11期46-49,共4页Journal of Southwest University(Natural Science Edition)

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;重庆市自然科学基金资助项目

摘　　要：研究了以双安息香缩三乙四胺[BBS]为中性载体,制备一种对铈离子(Ce3+)具有优良的电位响应特性的离子电极,其选择性从大到小次序为:Ce3+,La3+,Sr2+,Cu2+,Cd2+,Ag+,Ni2+,Cr3+,Mn2+,Ca2+,K+,Li+,Hg2+.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1.0×10-1～4.0×10-5mol/L Ce3+浓度范围呈近能斯特响应,斜率为32.9mV/p Ce3+(25℃),检测下限为1.25×10-5mol/L.采用交流阻抗和紫外光谱分析技术研究了配合物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 Ce^3＋ PVC membrane electrode based on bis-bebzoin-semitriethylenetetraamine [BBS] as a neutral carrier is reported, which displays selectivity sequence in the following order： Ce^3＋ , La^3＋ , Sr^2＋ , Cu^2＋ , Cd^2＋ , Ag^＋ , Ni^2＋ , Cr^3＋ , Mn^2＋ , Ca^2＋ , K^＋ , Li^＋ , Hg^2＋. The electrode exhibits Nernstian potential linear range to Ce^3＋ from 1.0 × 10^-1 to 4.0 × 10^-5 mol/L with a detection limit of 1.25 × 10^-5 mol/L and a slope of 32.9 mV/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 on BBS compound was used to determine the Ce^3＋ content in samples and satisfactory results were achieved.

关 键 词：双安息香缩三乙四胺 中性载体 离子选择性电极 铈离子 

分 类 号：O657.15[理学—分析化学]