CHARACTERIZATION OF A NEW NEW Ag+ -SELECTIVE ELECTRODE BASED ON N3S5-THIAAZACROWN ETHER AS NEUTRAL IONOPHORE

Abstract

A N 3 S 5 -azathiacrown ether has been newly synthesized in high yield. Electrode using this compound as ionophore shows high selectivity and sensitivity towards Ag + . The effect of plasticizers and ion-exchanger on the properties of electrode was also studied and detection limit of 3.8 × 10 −8 M Ag + was obtained. This sensor has a fast response time of <12 s and performs satisfactorily over a wide pH range of 3.6 __ 8.2. The electrode was also successfully used as indicator electrode in the titration of Cl -in tap water.

Characterization of a Ag+-Selective Electrode Based on Naphthalimide Derivative as Ionophore

“…The favorite donor binding site atom based on the hard-soft acid base (HSAB) concep t is still the primary factor, [1] so the most of the reported heavy metal ionophores for use in ion selective electrodes (ISEs) possess sulfur and/or nitrogen ato ms. [2] Among the heavy metal io ns, Ag + has attracted the interest of researchers, and many compo unds have been used to construct Ag + -ISEs. [2][3][4] Among these compounds, crown ethers show strong ability to form remarkably stable and selective complexes with heavy metal ions and have been found to exhibit interesting host-g uest complexatio n characteristics. [3] Especially, crown ethers containing nitrogen and sulfur donor atoms are of interest as they exhibit high affinities towards Ag + .…”

“…[5] During the last decade, considerable attentio n has been devoted to the constructio n of Ag + -selective electrodes with mixed-do nor crown ethers as ionophores. [2][3][4] In this work, a thiaazacrown ether has been characterized as Ag + -ISE ionophore and the response of polymeric membrane Ag + -ISE has been studied.…”

Aqueous nanodispersion of acetylene tethered, quinoxaline-containing conjugated polymer as fluorescence probe for Ag+

“…Researchers have reported some efficient methods to detect Ag + , such as atomic absorption, plasma emission spectroscopy, anodic stripping voltammetry and potentiometry, etc. [3][4][5] However, most of these methods are costly and time-consuming, and there is still a great challenge to find protocols to support technically simple Ag + detection. Therefore, to complement the aforementioned sophisticated methods, simpler detection approaches, such as fluorogenic or chromogenic probes, are in demand for the detection of Ag + in various situations.…”