【摘要】 首次研究了基于苯甲醛甘氨酸合镍（Ⅱ）金属配合物[Ni（Ⅱ）-BBAG]为中性载体的阴离子选择性电极。该电极对水杨酸根（Sal^-）具有优良的电位响应性能,并呈现出反Hofmeister选择性行为,其选择性次序为SM^->ClO₄^->SCN^->I^->NO₂^->Br^->NO₃^->SO₃^2->SO₄^2->Cl^-。在pH5.0的磷酸盐缓冲体系中,电极电位呈现近能斯特响应,线性响应范围为5.0×10^-5～1.0×10^-1mol/L,斜率为-58.5 mV/dec（20℃）,检测下限为2.0×10^-5 mol/L。采用交流阻抗技术和紫外可见光谱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。并将电极用于药品分析,其结果令人满意。更多还原

【Abstract】 A new Highly salicylate-selective PVC membrane electrode based on N, N’-bis-（benzaldehyde）-glycine nickel（Ⅱ） complex [Ni（Ⅱ）-BBAG] as neutral carrier is described, which displays a preferential potentiometric response to salicylate and an anti-Hofmeister selectivity sequence in following order: Sal^-> ClO₄^->SCN^->I^-> NO₂^-> Br^-> NO₃^-> SO₃²-> SO₄^2- > Cl^-. The electrode exhibits near Nernstian potential linear range of 5.0×10^-5～1.0×10^-5 mol/L with a detection limit 2.0×10^-5 mol/L and a slope of-58.5 mV/deeade in pH5.0 of phosphorate buffer solution at 20℃. 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. The electrode has the advantages of simplicity, fast response, fair stability reproducibility and low detection limit. The electrode can be applied to medicine analysis and the result is fair agreement with that given by precipitation method.更多还原