汞配合物为载体的高灵敏PVC膜碘离子选择电极研究

化学学报 ›› 2004, Vol. 62 ›› Issue (13): 1226-1229. 上一篇下一篇

研究论文

汞配合物为载体的高灵敏PVC膜碘离子选择电极研究

柴雅琴¹, 许文菊¹, 袁若¹, 徐岚¹, 江璠²

1. 西南师范大学化学化工学院, 重庆现代分析重点实验室, 重庆, 400715;
2. 苏州科技学院化学系, 苏州, 215011

投稿日期:2003-11-11 修回日期:2004-01-10 发布日期:2014-02-17
通讯作者: 袁若,E-mail:yuanruo@swnu.edu.cn E-mail:yuanruo@swnu.edu.cn
基金资助:
教育部优秀青年教师资助计划(No.教人司2002-40)及重庆市自然科学基金(No.2002-7477)资助项目.

Studies of Highly Sensitive PVC Membrane Iodide Selective Electrode Based on Complexes of Mercury(Ⅱ) as Neutral Carriers

CHAI Ya-Qin¹, XU Wen-Ju¹, YUAN Ruo¹, XU Lan¹, JIANG Fan²

1. College of Chemistry and Chemical Engineering, Chongqing Key Laboratory of Analytical Chemistry, Southwest China Normal University, Chongqing 400715;
2. Department of Chemistry, Suzhou College of Science and Technology, Suzhou 215011

Received:2003-11-11 Revised:2004-01-10 Published:2014-02-17

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摘要/Abstract

研究了基于四醋酸·双(5-甲基-1,3,4-噻二唑-2-硫)-烷基合汞(Ⅱ)配合为中性载体的阴离子选择性电极.这类电极对碘离子响应具有高灵敏和高选择性,并且呈现反Hofmeister序列行为,其选择性次序为:I^->SCN^->ClO₄^->Br^->NO₃^->Cl^->AcO^->SO₄^2-.其中由四醋酸·双(5-甲基-1,3,4-噻二唑-2-硫)-丁烷合汞(Ⅱ)配合物为载体的电极在pH为3.0磷酸盐缓冲条件下对I^- 的线性响应范围为4.0×10^-8～1.0×10^-2 mol/L,检测限为2.0×10^-8 mol/L,斜率为-59.1 mV/pcI^-.通过紫外-可见光谱和交流阻抗测试技术研究了电极的响应机理.结果表明,配合物中心金属原子的结构以及载体本身的结构与电极的响应行为之间有非常密切的构效关系.将该电极应用于嘉陵江水和缙云山泉水的测定,其结果令人满意.

关键词: 碘离子电极, 中性载体, 汞(Ⅱ)配合物

A highly selective and sensitive iodide electrode based on the complexes of bis(5-methyl-1,3,4-thiadiazol-2-yl-thio)alkane mercury(Ⅱ) acetate as neutral carrier was developed, which displays an anti-Hofmeister selectivity sequence: I^->SCN^->ClO₄^->Br^->NO₃^->Cl^->AcO^->SO₄^2-.The electrode exhibits Nernstian potentiometric response to iodide with a linear range from 4.0×10^-8 to 1.0×10^-2 mol/L, a detection limit of 2.0×10^-8 mol/L and a slope of -59.1 mV/pc I^- in pH 3.0 of phosphorate buffer solution at 20℃.The response mechanism was discussed in view of the a.c.impedance technique and the UV spectroscopy.The anti-Hofmeister behavior of the electrode results from the direct interaction between the central metal and the analyte ion and steric effect associated with the structure of the carrier.The electrode has the features of fast response, fair stability, reproducibility and low detection limit.The electrode was successfully applied to the determination of iodide in Jialing River and Spring in Jingyun Mountains with satisfactory results.

Key words: iodide electrode, neutral carrier, mercury(Ⅱ)complex

引用此文

柴雅琴, 许文菊, 袁若, 徐岚, 江璠. 汞配合物为载体的高灵敏PVC膜碘离子选择电极研究[J]. 化学学报, 2004, 62(13): 1226-1229.

CHAI Ya-Qin, XU Wen-Ju, YUAN Ruo, XU Lan, JIANG Fan. Studies of Highly Sensitive PVC Membrane Iodide Selective Electrode Based on Complexes of Mercury(Ⅱ) as Neutral Carriers[J]. Acta Chimica Sinica, 2004, 62(13): 1226-1229.

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汞配合物为载体的高灵敏PVC膜碘离子选择电极研究

Studies of Highly Sensitive PVC Membrane Iodide Selective Electrode Based on Complexes of Mercury(Ⅱ) as Neutral Carriers

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