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E-Journal of Chemistry
Volume 8 (2011), S1, Pages S203-S210
http://dx.doi.org/10.1155/2011/263256

Construction of Tb3+ PVC-MembraneElectrode Based on N,N’-Bis(pyrrolylmethylene)-2-aminobenzylamine

Hassan Ali Zamani,1 Zynab Rafati,1 and Soraia Meghdadi2

1Department of Applied Chemistry, Quchan Branch, Islamic Azad University, Quchan, Iran
2Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran

Received 17 April 2011; Accepted 3 July 2011

Copyright © 2011 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this work, we report as new Tb3+-PVC membrane sensor based on N,N’-bis(pyrrolylmethylene)- 2-aminobenzylamine (PMA) as a suitable ion carrier. Poly vinylchloride (PVC)-based membrane composed of PMA with oleic acid (OA) as anionic additives and acetophenone (AP) as plasticizing solvent mediators. The Tb3+ sensor exhibits a Nernstian slope of 19.7±0.4 mV per decade over the concentration range of 1.0×10-5 to 1.0×10-2 M and a detection limit of 4.6×10-6 M of Tb3+ ions. The potentiometric response of the sensor is independent of the solution pH in the range of 2.9–8.1. It has a very short response time, in the whole concentration range (∼5 s). The recommended sensor revealed comparatively good selectivity with respect to most alkali, alkaline earth, some transition and heavy metal ions. It was successfully employed as an indicator electrode in the potentiometric titration of Tb(III) ions with EDTA. The electrode was also employed for the determination of the fluoride ion in two mouth wash preparations and the determination of Tb3+ ions concentration in mixtures of three different ions.