Table of Contents
International Journal of Spectroscopy
Volume 2011, Article ID 746372, 7 pages
http://dx.doi.org/10.1155/2011/746372
Research Article

Nickel(II) Selective PVC-Based Membrane Sensor Using a Schiff Base

Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran

Received 2 November 2010; Revised 6 February 2011; Accepted 10 March 2011

Academic Editor: David Ramaker

Copyright © 2011 B. Rezaei et al. 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

A polyvinylchloride (PVC) membrane optode was prepared by using 1,2-di(o-salicylaldiminophenylthio)ethane (H2DSALPTE) as a chelating reagent for selective determination of Ni(II) ions. The optimized membranes incorporating H2DSALPTE as an ionophore, sodium tetraphenylborate (NaTPB) as an anion excluder, and tributyl phosphate (TBP) as a solvent mediator were prepared and applied for determination of Ni(II) ions. The membrane responded to Ni(II) ion by changing the color from yellow to green in an acetate buffer solution at pH 6.0. The best performance was observed when the membrane having a composition of 3.17% ligand, 31.64% PVC, 63.29% TBP, and 1.90% NaTPB. The membrane can be worked well over a wide concentration range from 1.0 × 10−5 to 5.0 × 10−3 M. The membrane exhibited a detection limit of 8.51 × 10−6 M, and the response time of the membrane was within 7–12 min depending on the concentration of Ni(II) ions. The selectivity of the probe towards nickel determination was found to be very good. Experimental results showed that the probe could be used as an effective tool in analyzing the Ni(II) content of water samples.