摘要
以水杨醛缩硫代氨基脲合铜(Ⅱ)为中性载体,制备了一种对碘离子(I-)具有优良的电位响应特性并呈现出反Hofmeister选择性行为的离子电极,其选择性大小依次为:I-,Sal-,ClO-3,H2PO-4,2,SO2-4,SCN-,Cl-,NO-3,NO-SO2-4.该电极在pH2 0的磷酸盐缓冲体系中具有最佳的电位响应,在1 0×10-1～8 0×10-5mol/LI-浓度范围呈近能斯特响应,斜率为-54 0mV/pI-(25℃),检测下限为4 0×10-5mol/L.采用交流阻抗和紫外光谱分析技术研究了配合物中心金属原子以及配合物本身的结构对电极电位响应行为的作用机理.将该电极用于药物含碘量的测定,获得满意的结果.
A new polymeric membrane iodide selective electrode based on o-hydroxybenzaldehyde thiosemicarbazone copper(Ⅱ) metallic complex [Cu(Ⅱ)-HBDHT] as neutral carrier is reported, which displays an anti-Hofmeister selectivity sequence in the following order: 「iodide>salicylate>perchlorate>thiocyanate>nitrate>nitrite>sulfite>phosphate>sulfate」. The electrode exhibits Nernstian potential linear range to iodide from 1.0×10^(-1) to 8.0×10^(-5) mol/L with a detection limit 4.0×10^(-5) mol/L and a slope of -54.0 mV/ pSCN^- in pH 2.0 of phosphorate buffer 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 the central metal and the analyte ion and steric effect associated with the structure of the carrier.
出处
《西南师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2004年第1期93-97,共5页
Journal of Southwest China Normal 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(2002-7477).
