以一种新的钴(Ⅱ)与meso-四-(2-烷氧基苯基)卟吩生成的配合物为中性载体的碘离子选择电极的制备及性能  

Preparation and Study of Iodide Ion Selective Electrode Using a New Coordination Complex of Cobalt(Ⅱ) and meso-Tetrakis-(2-alkoxyphenyl)-porphyrin as Neutral Carriers

作　　者：梁克中[1] 牟维君[2] 

机构地区：[1]重庆三峡学院化学与环境工程系,重庆404000 [2]重庆三峡医药高等专科学校,重庆404000

出　　处：《理化检验（化学分册）》2009年第5期508-511,513,共5页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：重庆市教委科研项目(KJ081103)资助

摘　　要：meso-四-（2-烷氧基苯基）卟吩[-（ROP）P]与金属离子Co（Ⅱ）、Cu（Ⅱ）、Ni（Ⅱ）生成配合物，并以元素分析验证其组成，用以上配合物作为中性载体，制备了电位型离子选择性电极，电极膜组分的最佳配比用正交法选定。结果表明：在上述3种载体中[Co（Ⅱ）-（ROP）P]作为载体的电极对Ⅰ^-具有最好的电位响应特性。在pH3．0的磷酸盐缓冲体系中该电极具有最佳的电位响应，在1.0×10^-6～1．0×10^-1mol·L^-1浓度范围内呈近能斯特响应，斜率为-58．2mV／dec（25℃），检出限（3S／N）为8．0×10^-7mol·L^-1，用交流阻抗及紫外可见光谱技术研究了电极的响应机理。Coordination complexes of meso-tetrakis-（2-alkoxyphenyl）-porphrin [（ROP）P] with metal ions, i. e, Co（ Ⅱ ）, Ni（ Ⅱ ） and Cu（ Ⅱ ） were prepared and their compositions were identified by elementary analysis. Ion selective electrodes were prepared by using the new complexes as neutral carriers, and composition of the electrode membrane was selected by the method of orthogonal testing. It was found that ISE using [-Co（ Ⅱ ）-（ROP）P] as neutral carrier showed best potential response toward I-ion among the 3 complexes. Optimum potential response was attained in a phosphate buffer medium of pH 3. 0. Approximate nernst response （at 25℃） was obtained in the range of 1.0 × 10^-6 - 1.0×10^-1mol·L^-1 of I^-ion with its detection limit （3S/N） of 8. 0×10^-7mol·L^-1, and with its slope of -58. 2 mV/dec. Electrochemical behavior and potential response mechanism of the electrode were studied by the UV-VIS spectroscopy and the AC impedance of the membrane.

关 键 词：meso-四-(2-烷氧基苯基)卟吩 碘离子选择电极 钴(Ⅱ)配合物 钴(Ⅱ) 中性载体 

分 类 号：O657.1[理学—分析化学]