A new cerium (III) ion selective electrode based on 2,9-dihydroxy-1,10-diphenoxy-4,7-dithia decane, a novel synthetic ligand

Highlights: → An ISE based on a new ionophore is used successfully to determine cerium (III) cation over the concentration range 1.0 x 10-1-2.1 x 10-9 mol l-1. → It has a fast response time of 10 s. → It has comparatively good selectivities with respect to metal cations. → It can be used in a pH range of 5.0-8.0. → It also was used as an indicator electrode in potentiometric determination of F- ion in some real sample preparations. - Abstract: In the present study, a novel electrode based on 2,9-dihydroxy-1,10-diphenoxy-4,7-dithiadecane (DHDPDTD) that is selective to cerium (III) cations was evaluated electrochemically, and a Nerenstian slope (19.3 ± 1 mV decade-1) over a concentration range of 1.0 x 10-8-1.0 x 10-1 M and a detection limit of 2.1 x 10-9 M were observed. The proposed electrochemical sensor displayed a rapid response time of 10 s, improved selectivity towards Ce (III) cations in the presence of alkali, alkaline earth, transition and heavy metal cations, and could be used in a pH range of 5.0-8.0. Additionally, the proposed sensor was used as an indicator in the potentiometric titration of fluoride and the determination of F- ions in real samples.