Highly Selective Sensing of Copper(II) Ion by Polymeric Film Optical Chemosensor Based on a New Pyridine-Substiuted Schiff-Base

Abstract

A new optode for the sensitive and selective determination of copper (II) ion based on a change in absorption spectrum of a polymeric thin film in aqueous solution was proposed. A composed membrane of polyvinylchloride, different plasticizers and oleic acid as anionic additive was prepared. The influence of different plasticizers on sensitivity, linear range and selectivity of the membrane film were studied. Satisfactorily, analytical sensing characteristics, to determine of the copper ion in terms of the selectivity, reversibility and reproducibility in a good detecting range were obtained. In addition, the optical film responds to copper (II) ion, irreversibly, over a wide dynamic range 3.1×10^-10 to 2.3×10^-4 M with a response time ≈ 5 Min obtained confidently. The optode membrane was successfully, applied to determination of copper (II) ion in spiked samples.