Potentiometric types of ion-selective electrodes (ISEs) have been developed for transition metals as well as alkali and alkaline earth metals, 1,2 and applied to clinical and industrial measurements. Potentiometric detection based on ion-selective electrode as a simple method offers several advantages, such as speed, ease of preparation, procedure, simple instrumentation, relatively fast response, wide dynamic ranges, selectivity, and low cost.Recently, a group of acyclic oligoether, polythiacrown ethers and acyclic polythia compounds have been used as ionophores for Ag + measurements. [3][4][5][6][7][8] Recently, Chen et al. 9 used benzothiazolyl calix [4]arene to construct an ion-selective electrode for the Ag + ion. However, the limit of detection of the method is higher than that of the proposed method. In addition, the calix[4]arene method suffers from many interfering ions, such as Zn 2+ , Cd 2+ , and Pb 2+ . Octahydroxycalix [4]arene is a cyclic oligomer of 1,3
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