双核汞(Ⅱ)席夫碱配合物为中性载体的碘离子选择性电极研究  

STUDY ON THE IODIDE ISE USING THE BINUCLEAR MERCURY(Ⅱ)-SCHIFF'S BASE COMPLEX AS NEUTRAL CARRIER

作　　者：归国风[1] 柴雅琴[1] 袁若[1] 孙爱丽[1] 

机构地区：[1]西南师范大学,化学化工学院,重庆市现代分析化学重点实验室,重庆400715

出　　处：《理化检验（化学分册）》2006年第5期325-328,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：重庆市自然科学基金(CSTC-2004BB4149);西南师范大学博士项目基金(swnuB2004021)资助

摘　　要：研制了以双核汞(Ⅱ)-4-甲基-2,6-谷氨酸-酚配合物(简写作Hg(Ⅱ)2-MGAP)为中性载体的电位型阴离子选择性电极,并研究其电化学特性。结果表明,该电极对I-具有良好的电位响应特性,且呈现反Hofmeister行为,其选择性序列为:I->Sal->ClO4->NO2->Br->NO3->F- >SCN->SO32-。在pH 2．5的磷酸盐缓冲体系中该电极对I-具有最佳的电位响应,在7．0×10-7～1．0×10-1mol·L-1浓度范围内呈近能斯特响应,斜率为-53．1 mV·dec-1(25℃),检出限为9．0×10-7mol·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,并初步地将电极用于药品分析。A new potential iodide ion selective electrode by using the coordination complex of binuclear mercury（Ⅱ） 4-methyl-（2, 6-glutamic acid）-phenolate [abbreviated as Hg（ Ⅱ）2-MGAP] as neutral carrier was prepared and its electrochemical behavior studied. It was found that this electrode showed anti-Hofmeister behavior and good potential response toward iodide ion in the concentration range of 7.0× 10^-7-1.0× 10^-1 mol· L^-1 , with a detection limit of 9. 0×10^-7mol·L^-1, and a slope of -53. 1 mV ·dec^-1 in a phosphate buffer solution of pH 2. 5 at 25℃ Selectivity of this electrode towards some common anions was found to be in the following order： I^-〉Sal〉C104〉NO2-〉Br-〉NO3-〉F-〉SCN-〉SO3^2-. The response mechanism of the electrode was studied by UV-VIS spectrometry and AC impedance technique. The application of this electrode to the analysis of drug samples was studied tentatively.

关 键 词：双核汞(Ⅱ)-4-甲基-2 6-谷氨酸一酚 中性载体 碘离子 离子选择性电极 

分 类 号：O643.36[理学—物理化学] TS254.28[理学—化学]