A novel sensor based on a heterocyclic ionophore for cerium (III) analysis in real samples

Abstract

A new polyvinyl choloride (PVC) membrane sensor for cerium<br />(III) was prepared based on 4,13-didecyl-1,7,10,16-tetraoxa-4,13-<br />diazacyclooctadecane (kryptofix22DD) as an ionophore. The sensor<br />exhibites a linear concentration range of 1.0×10-6 to 1.0×10-1 M, with a<br />Nernstian slope of 18.0±1.0 mV/decade, and a detection limit of 9.7×10-7<br />M. It has a fast response time (5 s) and can be used for two months<br />without any considerable divergence in its potential. The proposed<br />sensor revealed high selectivity toward Ce3+ ion with respect to some<br />alkali, alkaline earth and transition metal cations. It could be used in a<br />wide pH range of 2.0-11.0. The sensor was successfully used as an<br />indicator electrode in potentiometric titration of Ce3+ ion with<br />ethylenediaminetetraacetic acid (EDTA) and sodium iodide (NaI)<br />solutions, and in determination of Ce (III) concentration in real samples.