Synthesis of a New Calix[4]Arene and Its Application in Construction of a Highly Selective Silver Ion-Selective Membrane Electrode

Saeed Taghvaei-Ganjali,Reza Zadmard,Mohammad Reza Ganjali,Masoumeh Zeyaei,Farnoush Faridbod,Kabeh Rahnama

doi:10.1155/2009/601089

Abstract

A PVC membrane sensor for Ag (I) ions has been prepared. The membrane has 5, 11, 17, 23-tetra-tert-butyl-25-(3-N, N-diethyldithio carbamoylpropoxy)-26,27,28-tris-propoxy calix[4]arene (CAD) as a carrier. It was found that the sensor exhibits a Nernstian response for Ag+ ions over a wide concentration range (10−2–10−6 M). Additionally, it illustrates a fast response time (about 5 seconds), and it can be used for at least 2 months without any considerable divergence in potentials. The nature of the plasticizer, the additive, the concentration of internal solutions in the electrodes, and the composition of the membrane were investigated. Furthermore, the suggested membrane electrode revealed good selectivities for Ag+ over a variety of other metal cations, and it could be used in the pH range of 3.0–7.0. Eventually, it was successfully applied as an indicator electrode for the potentiometric titration of Ag+ ion with NaCl.

Highlights

A vast ranges of chemically, clinically, or environmentally important analytes are routinely monitored, using ion-selective electrodes based on impregnated polymeric membranes [1,2,3]
Several neutral carriers have been used in the PVC electrode membrane studies of some transition and heavy metal ions [8,9,10,11,12,13,14,15]
The use of 5, 11, 17, 23-tetra-tert-butyl-25(3-N, N-diethyldithio carbamoylpropoxy)-26, 27, 28-trispropoxy calix[4]arene is reported as an excellent neutral carrier in the construction of a highly selective silver PVCbased membrane electrode

Summary

Introduction

A vast ranges of chemically, clinically, or environmentally important analytes are routinely monitored, using ion-selective electrodes based on impregnated polymeric membranes [1,2,3]. The membrane number 9 with the composition of 61% DBP, 5% CAD, 4% NaTPB, and 30% PVC results in the best response.

Results

Conclusion