Cerium(III) Ion-Selective Electrodes Based on 1,4,7-Trithiacyclononane

Authors : Hamid Reza POURETEDAL, Abolfazl SEMNANI

Pages : 711-721

View : 16 | Download : 9

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Novel plasticized polymeric membrane insert ignore into journalissuearticles values(PPME); and coated platinum wire insert ignore into journalissuearticles values(CPWE); electrodes based on 1,4,7-trithiacyclononane and oleic acid, as a good lipophilic additive for highly selective determination of Ce3+ ions, have been developed. The electrodes exhibit a Nernstian slope of 19.4 mV/decade insert ignore into journalissuearticles values(for both electrodes); over a wide Ce3+ ion concentration range, from 5.0 \times 10-6-5.0 \times 10-2 M and 1.0 \times 10-7-1.0 \times 10-2 M for PPME and CPWE, respectively. The limits of detection were 3.5 \times 10-6 and 8.0 \times 10-8 M for PPME and CPWE, respectively. The electrodes possess a fast response time of 15 s, can be used for at least 3 months without observing any deviation, and can be used in a pH range of 5.0-8.0. The proposed electrodes could reveal excellent selectivity for Ce3+ over a wide variety of alkali, alkaline earth, some transitions, and heavy metal ions. The practical utility of the electrodes has been demonstrated by their use as indicator electrodes in the potentiometric titration of Ce3+ ions with EDTA and vice versa, and in the determination of fluoride ions in some mouthwash preparations.
Keywords : Cerium III, selective electrode, coated platinum wire electrode, plasticized polymeric membrane electrode