Evaluation of a wide rim phosphorylated calix[4]arene`s properties as a sensory molecule in an Er(III)-PVC membrane sensor

Authors : Abbas Ali ZAMANI, Massoumeh PARINEJAD, Fataneh JAMALI

Pages : 907-916

Doi:10.3906/tar-1212-5

View : 19 | Download : 6

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :This study concerns the evaluation of ionophoric properties of a functionalized calix[4]arene, named 5,17-bisinsert ignore into journalissuearticles values(diphenylphosphinoyl);- 25,26,27,28-tetrapropoxycalix[4]arene insert ignore into journalissuearticles values(Calix);, by its application as a sensing material in an erbiuminsert ignore into journalissuearticles values(III);-PVC membrane potentiometric sensor. A membrane formed by 30% PVC, 65% dioctyl phthalate insert ignore into journalissuearticles values(DOP); as plasticizing solvent mediator, 2% sodium tetraphenyl borate insert ignore into journalissuearticles values(NaTPB); as ion excluder, and 3% of Calix as ionophore shows the best performance of the sensor. The prepared sensor presents a nearly Nernstian response insert ignore into journalissuearticles values(a slope of 20.0 \pm 0.5 mV/decade); over a concentration range of 1 \times 10-7--1 \times 10-3 M of erbium ions, with a limit of detection of 3.8 \times 10-8 M. Its potential response was independent of pH variation in the relatively wide range 4.5--6.5. The dynamic response time of the electrode to achieve a steady potential was found to be about 7 s. The selectivity of the sensor towards erbium ions with respect to several mono-, di-, tri-, and tetravalent metal ions was examined. The prepared sensor can be used for 3 months without considerable divergences in potential response. The performance of the sensor was examined as an indicator electrode for complexometric titration of erbium solutions by EDTA.
Keywords : Phospha calix 4 arene, ion binding properties, Er III, potentiometric sensor