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

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 sensor exhibites a linear concentration range of 1.0×10-6to 1.0×10-1m, with a nernstian 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 months without any considerable divergence in its potential. the proposed sensor revealed high selectivity toward ce3+ion with respect to some alkali, alkaline earth and transition metal cations. it could be used in a wide ph range of 2.0-11.0. the sensor was successfully used as an indicator electrode in potentiometric titration of ce3+ion with ethylenediaminetetraacetic acid (edta) and sodium iodide (nai) solutions, and in determination of ce (iii) concentration in real samples.