by Keyword: Solid-state ion selective microelectrode

de Oliveira, I. A. M., Risco, D., Vocanson, F., Crespo, E., Teixidor, F., Zine, N., Bausells, J., Samitier, J., Errachid, A., (2008). Sodium ion sensitive microelectrode based on a p-tert-butylcalix[4]arene ethyl ester Sensors and Actuators B: Chemical 130, (1), 295-299

Planar sodium-selective potentiometric microelectrodes with a conducting polymer (polypyrrole doped with cobaltabis(dicarbollide) ions ([3,3'-Co(1,2-C2B9-H-11)(2)](-))) as solid contact layer between the polymeric sensitive membrane and the platinum substrate have been constructed. The p-tert-butylcalix[4]arene ethyl ester was used as ionophore for sodium recognition. The microelectrode shows a linear response for Na+ concentrations between 3.0 x 10(-6) and 1.0 x 10(-1) M with a Nernstian slope of 58.65 +/- 2 mV per decade and a detection limit of 1.45 x 10(-6) M. The response time was 14 s, and the electrode is suitable for use within the pH range of 3-10.

JTD Keywords: Sodium, Polypyrrole, Calix[4]arene, Solid-state ion selective microelectrode, Potentiometric