水杨醛缩丙醇胺Schiff碱锰(Ⅱ)水杨酸根离子选择性电极的研究  

On Highly Selective Salicylating Electrode Based on New Complex of Manganese(Ⅱ)as Neutral Carrier

作　　者：甘贤雪[1] 王丽[1] 

机构地区：[1]宜宾学院化学化工系,四川宜宾644000

出　　处：《宜宾学院学报》2006年第12期94-96,共3页Journal of Yibin University

摘　　要：本文研究了基于水杨醛缩丙醇胺Schiff碱(Ⅱ)锰金属配合物[Mn(Ⅱ)-SaPa]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I^-＜SO_3^(2-)＜SO_4^(2-)＜PO_4^(3-)＜NO_3^-＜A_C^-＜SCN^-＜NO_2^-＜CIO_4^-＜Sal^-。在pH5．0的磷酸盐缓冲体系中,电极电位呈现近能斯特响应,线形响应范围为5．0×10^(-5)-1．0×10^(-1)mol/L,斜率为-56．8mV/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。A new highly salicylate -selective PVC membrane electrode using Manganese（Ⅱ） metallic complex [ Mn（ Ⅱ ） -SaPa] as neutral carrier is described, which indicates a preferential potentiometric response to salicylate and an anti - Hofmeister selectivity in a sequence in the following order： I^-〈SO3^2-〈SO4^2-〈PO4^3-〈NO3^-〈AC^-〈SCN^-（NO2^-〈ClO4^-〈Sal^-. The electrode exhibits near Nemsitan potential with a linear range of 5.0×10^-5-1.0×10^-1mol/L and a detection limit of 2.0×10^-5mol/L and a slope of - 56.8mV/decade in the phosphorate buffer solution at pH5.0 and 20℃. The response mechanism is discussed with the help of the A C. impedance technique and UV spectroscopy. These deviations result from the direct interaction between the central metal and the analyte ion and the 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 in fair agreement with that given by precipitation method.

关 键 词：水杨醛缩丙醇胺Sehiff碱(Ⅱ)锰金属配合物 中性载体 水杨酸根 离子选择性电极 

分 类 号：O646.54[理学—物理化学]