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

A new polyvinyl choloride (PVC) membrane sensor for cerium(III) was prepared based on 4,13-didecyl-1,7,10,16-tetraoxa-4,13-diazacyclooctadecane (kryptofix22DD) as an ionophore. The sensorexhibites a linear concentration range of 1.0×10-6 to 1.0×10-1 M, with aNernstian slope of 18.0±1.0 mV/decade, and a detection limit of 9.7×10-7M. It has a fast response time (5 s) and can be used for two monthswithout any considerable divergence in its potential. The proposedsensor revealed high selectivity toward Ce3+ ion with respect to somealkali, alkaline earth and transition metal cations. It could be used in awide pH range of 2.0-11.0. The sensor was successfully used as anindicator electrode in potentiometric titration of Ce3+ ion withethylenediaminetetraacetic acid (EDTA) and sodium iodide (NaI)solutions, and in determination of Ce (III) concentration in real samples.