Highly selective and sensitive sensor based on 4,13-didecyl-1,7,10,16-tetraoxa-4,13-diazacyclooctadecane as a heterocyclic ionophore

Abstract

A new polyvinyl choloride (PVC) membrane sensor for cerium (III) was <br />prepared based on 4,13-didecyl-1,7,10,16-tetraoxa-4,13-diazacyclooctadecane <br />(kryptofix22DD) as an ionophore. The sensor exhibites a linear concentration <br />range of 1.0×10<br />-6<br />to 1.0×10<br />-1<br />M, with a Nernstian slope of 18.0±1.0 mV/decade, <br />and a detection limit of 9.7×10<br />-7<br />M. It has a fast response time (5 s) and can be <br />used for two months without any considerable divergence in its potential. The <br />proposed sensor revealed high selectivity toward Ce<br />3+<br />ion with respect to some <br />alkali, alkaline earth and transition metal cations. It could be used in a wide pH <br />range of 2.0-11.0. The sensor was successfully used as an indicator electrode <br />in potentiometric titration of Ce<br />3+<br />ion with ethylenediaminetetraacetic acid <br />(EDTA) and sodium iodide (NaI) solutions, and in determination of Ce (III) <br />concentration in real samples.