一种新型金属配合物水杨酸根离子电极  

A Novel Salicylate-Selective Electrode Based on the Complex of Zn(Ⅱ) as a Neutral Carrier

作　　者：王丽[1,2] 程晓丹[1] 甘贤雪[1] 柴雅琴[2] 

机构地区：[1]宜宾学院化学与化工学院,四川宜宾644000 [2]西南大学化学与化工学院,重庆400715

出　　处：《宜宾学院学报》2011年第12期74-76,共3页Journal of Yibin University

摘　　要：合成了2,3-丁二酮双缩苯甲酰肼合锌(Ⅱ)金属配合物,并以其为中性载体制备了阴离子选择性电极.该电极对水杨酸根(Sal-)具有优良的电位响应性能和选择性,并呈现反Hofmeister选择性行为,其选择性为:Sal-﹥ClO4-﹥SCN-﹥Ⅰ-﹥NO3-﹥NO2-﹥Br-﹥F-﹥Cl-﹥SO24-.在pH为4.0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2.5×10-5～1.0×10-1mol/L,斜率为-54.5 mV/decade,检测下限为1.0×10-5mol/L.采用交流阻抗技术研究了电极的响应机理,结果表明载体本身的结构与电极的响应性能间有非常密切的关系.电极用于药品分析,其结果令人满意.A novel Salicylate-Selective electrode based on butane-2,3-dione bis(benzoylhydrazide) Zn(Ⅱ) complex as ionophore is described,which exhibits high selectivity for salicylate over many other common anionsns with an anti-Hofmeister selectivity sequence,namely Sal-﹥ClO-4﹥SCN-﹥I-﹥NO-3﹥NO-2﹥Br-﹥F-﹥Cl-﹥SO2-4.The electrode exhibits a near-Nernstian response to the salicylate ion range from 2.5×10-5～1.0×10-1 mol/L,which has a detection limit of 1.0×10-5 mol/L and a slope of-54.5 mV/decade in a phosphate buffer solution of pH 4.0.The response mechanism is discussed from the view of AC impedance technique.The electrode is applied for the medicine analysis and the result obtained has been satisfactory.

关 键 词：Schiff碱及其金属配合物 中性载体 高选择性 水杨酸根离子 

分 类 号：O65[理学—分析化学]