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by Keyword: Solid-state ion selective microelectrode


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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.

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