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Vol. 25 No. 2 (2013): Vol 25 Issue 2

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Lead(II)-Selective Coated Graphite Electrode Based on Benzo-18-crown-6

https://doi.org/10.14233/ajchem.2013.13109
Somayeh Ghorbani
Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran
Gholam Hossein Rounaghi
Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran
Somayeh Tarahomi
Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran
Massoumeh Mohajeri
Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran

Corresponding Author(s) : Gholam Hossein Rounaghi

ronaghi0970@mshdiau.ac.ir, ghrounaghi@yahoo.com

Asian Journal of Chemistry, Vol. 25 No. 2 (2013): Vol 25 Issue 2

Abstract

A lead(II)-selective coated graphite electrode based on benzo-18-crown-6 (B18C6) was prepared. This electrode with the membrane composition of 20 % dioctylphthalate, 55 % poly(vinyl chloride), 20 % carbon powder and 4 % benzo-18-crown-6, exhibited a near Nernstian response toward Pb(II) cation over a concentration range 1.0 ×10-5 to 1.0 ×10-1 M with a slope of 28.8 mV per decade and detection limit of 5.0 ×10-6 M. Furthermore, it showed a response time of 30 s and can be used for 3 months without any divergence in potentials. The useful pH range of this electrode is 1.5-5.0. To assess its analytical applicability, the constructed electrode was successfully applied as an indicator electrode in the potentiometric titration of Pb(II) ion solution with EDTA.

Keywords

Benzo-18-crown-6 Pb(II) Coated graphite electrode Potentiometry
Ghorbani, S., Hossein Rounaghi, G., Tarahomi, S., & Mohajeri, M. (2012). Lead(II)-Selective Coated Graphite Electrode Based on Benzo-18-crown-6. Asian Journal of Chemistry, 25(2), 905–908. https://doi.org/10.14233/ajchem.2013.13109
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