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A solid state Cr(VI) ion-selective electrode based on polypyrrole

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Abstract

We report on a graphite electrode onto which polypyrrole was electrodeposited and then doped with chromate ion. This electrode can serve as a Cr(VI)-selective solid-state electrode. Electropolymerization of pyrrole was performed potentiostatically at 0.80 V (vs. SCE) using battery graphite as the working electrode in a solution containing 0.10 M of pyrrole and 20 mM of chromate. A platinum wire was used as an auxiliary electrode. The new electrode displays high selectivity, a very wide dynamic range, a sufficiently fast response time and a good shelf lifetime. It shows a linear Nernstian response over 1.0 × 10−6 to 1.0 × 10−1 M concentration range (with a slope of 26.55 ± 0.20 mV per log of concentration). The detection limit is 0.5 μM, and the pH optimum is 7.0.

A highly selective solid state Cr(VI) ion-selective electrode based on polypyrrole conducting polymer was prepared. The introduced Cr(VI) micro sensor electrode exhibited linear response over a wide working concentration range with a high regression coefficient and a near Nernstian slope. The SEM image of PPy/CrO4 thin film shows unevenly distributed nanoparticles.

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Acknowledgments

The authors appreciate the post graduate studies of university of Guilan for financial support of this work.

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Authors and Affiliations

  1. Chemistry Department, Faculty of science, University of Guilan, Rasht, Iran, P.O.Box: 41635–1914

    Reza Ansari, Ali Fallah Delavar & Ali Mohammad-khah

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  1. Reza Ansari
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  2. Ali Fallah Delavar
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  3. Ali Mohammad-khah
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Correspondence to Reza Ansari.

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Ansari, R., Delavar, A.F. & Mohammad-khah, A. A solid state Cr(VI) ion-selective electrode based on polypyrrole. Microchim Acta 178, 71–79 (2012). https://doi.org/10.1007/s00604-012-0802-9

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  • DOI: https://doi.org/10.1007/s00604-012-0802-9

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