用于高性能铅离子选择电极的含氮有机物载体

Nitrogen-Bearing Organic Compounds as Carriers in Lead Ion-Selective Electrodes with Excellent Response

本文系统地综述高性能铅离子选择电极中掺杂于膜内的含氮有机物铅离子传感载体,如双席夫碱、吡啶酰胺、酰羟胺、苯腙,以及载体分子结构特征与铅离子电极性能之间的关系。电极对铅离子的选择性能与载体分子结构密切相关,无论是在载体还是在膜基体中引入氰基都可以明显改善铅离子电极探测下限;加强传感机理的深入研究,为高性能载体的研究指明方向。

Bis-Schiff base, pyridinedicarboxamide, acylhydroxylamine, and phenylhydrazone, acting as sensing agents in lead-ion selective electrodes based on ionophore-doped membranes with excellent response characteristics, are systematically summarized according to the latest literatures and our latest research. The relationship between the response characteristics of the lead （ Ⅱ ） ion-selective electrodes assembled by the carriers and their molecular structures is also elaborated. It is noteworthy that the selectivity of the electrode towards lead ions over other cations is closely related to the molecular structure of the carrier. The presence of cyano group would largely improve the detection limit whether it is introduced into the carrier or membrane matrix. The sensing mechanism should be emphasized in order to find out the direction for developing high performance carriers.