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首次研究以N,N’-二(5-溴亚水杨基)-2,6-吡啶二氨铜(Ⅱ)配合物为载体的PVC膜电极,其对硫氰酸根离子(SCN-)具有优良的电位响应特性并呈现出反Hof meister选择性行为,其选择性从大到小次序为:SCN-,I-,Cl O4-,Sal-,Br-,NO2-,Cl-,SO32-,NO3-,SO24-.电极在pH=5.0的磷酸盐缓冲体系中,对SCN-在1.0×10-1～4.0×10-6mol/L浓度范围内呈近能斯特响应,斜率为58.5 mV/dec(25℃),检测下限为2.0×10-6mol/L.采用交流阻抗技术和紫外可见光谱技术初步研究了阴离子与载体的作用机理,结果表明电极的反Hof meister选择性行为与配合物中心金属原子的结构以及载体本身的结构有非常密切的构效关系.该电极具有制备简单、响应快、重现性好、检测限低等优点.将电极应用于实验室废水和人的尿液样品分析,结果令人满意.
For the first time, the PVC membrane electrode supported on N, N’-bis (5-bromo-salicylidene) -2,6- pyridinediamine copper (Ⅱ) Excellent potential response characteristics and showed the anti-Hof meister selective behavior, the order of its selectivity descending order: SCN-, I-, Cl O4-, Sal-, Br-, NO2-, Cl-, SO32-, NO3-, SO24-. In pH = 5.0 phosphate buffer system, the potential of SCN- in the range of 1.0 × 10-1 ~ 4.0 × 10-6mol / L has a near-Nernst response with a slope of 58.5 mV / dec at 25 ℃ and the detection limit was 2.0 × 10-6mol / L. The mechanism of interaction between anion and support was studied by AC impedance spectroscopy and UV-visible spectroscopy. The results show that the anti-Hof meister selectivity behavior and the complex center The metal atom structure and the structure of the carrier itself have very close structure-activity relationship.The electrode has the advantages of simple preparation, fast response, good reproducibility, low detection limit, etc. The electrode is applied to laboratory waste water and human urine sample Analysis, the results are satisfactory.