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首次研究以二醋酸双(呋喃甲醛)缩1,3-丙二胺汞(Ⅱ)配合物为载体的PVC膜电极。该电极对碘离子呈现出优良的电位响应特性并呈现反Hofmeister行为,电极在pH2.0的磷酸盐缓冲体系中,对I~-在10×10~(-4)～5.0×10~(-7)mol/L浓度范围内呈近能斯特响应,电极响应斜率为64.7mV/dec(20℃),检测下限为2.0×10~(-7)mol/L。采用交流阻抗技术和紫外可见光谱分析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。将该电极用于实际样品分析,所得结果令人满意。
For the first time, PVC membrane electrode with bis (furfural) 1,3-propanediamine mercury (Ⅱ) complex as carrier was studied. The electrode showed excellent potential response to iodide ion and showed anti-Hofmeister behavior. The pH value of the electrode was about 10 ~ 10 ~ (-4) ~ 5.0 × 10 ~ (- 7) mol / L. The slope of electrode response was 64.7mV / dec (20 ℃). The detection limit was 2.0 × 10 -7 mol / L. The response mechanism of the electrode was studied by AC impedance spectroscopy and UV-Vis spectroscopy. The results show that there is a very close structure-activity relationship between the metal atom structure of the complex and the structure of the carrier itself and the electrode response. The electrode was used for actual sample analysis and the results were satisfactory.