水杨醛二缩邻苯二胺汞(Ⅱ)配合物为载体的高选择性碘离子电极的研究

Study on N,N′ O phenylenebissalicylideneimine Complexes of Hg(Ⅱ)as Carriers for Highly Selective Iodide Electrodes

研究了希夫碱金属［Ｃｏ（Ⅱ）、Ｍｎ（Ⅱ）、Ｚｎ（Ⅱ）、Ｈｇ（Ⅱ）］配合物为载体的阴离子选择性电极，结果表明，水杨醛二缩邻苯二胺汞（Ⅱ）对碘离子具有高的选择性，且电极呈现反Ｈｏｆｍｅｉｓｔｅｒ行为，其选择性次序为：Ｉ－＞ＳＣＮ－＞Ｂｒ－＞ＣｌＯ－４＞Ｃｌ－＞ＮＯ－２＞ＮＯ－３＞ＳＯ２－４。该电极响应速度快，具有良好的稳定性，使用寿命在三个月以上。用交流阻抗，紫外可见光谱技术研究了电极的响应机理并将电极用于药品分析。

In this paper, a solvent polymeric membrance anion selective electrodes based on N,N′ O phenylenebissalicylidene imine complexes of Hg(Ⅱ) as carrier is developed. It showed that the electrod has high selectivity toward the iodide ion and demonstrates anti Hofmerister behaviour. The electrode exhibited a near Nernstian potentiometric response for 10 -2 ￣10 -6 mol/L I - with a detection limit of 3.98×10 -7 mol/L and a slope of 52 mV/pI -. The electrode has fast response time, fair stability and reproducibility. The selectivity secquence observed is iodide>thiocyanate>bromide>perchlorate>chloride>nitrite>nitrate>sulfate. The response mechanism of the electrode was also studied with the spectroscope and ac impedance techniques.