Ammonium ions determination with polypyrrole modified electrode

Ammonium ions determination with polypyrrole modified electrode

Authors

  • Luciana T. S. Mendes Universidade Estadual de Londrina
  • Luiz Henrique Dall´Antonia Universidade Estadual de Londrina

DOI:

https://doi.org/10.5433/1679-0375.2007v28n1p79

Keywords:

Ammonium, Sensor, Polypyrrole.

Abstract

The present work relates the preparation of polypyrrole films (PPy) deposited on surfaces of glass carbon, nickel and ITO (tin oxide doped with indium) on PET plastic, in order to study the ammonium detection. The popypyrrole films were polymerized with dodecylbenzenesulfonate (DBSA) on the electrodes, at + 0,70 V vs. Ag/AgCl, based on a solution containing the pyrrole monomer and the amphiphilic salt. Films deposited on glass carbon presented better performance. Cyclic voltammetries, between – 1,50 to + 0,5 V vs. Ag/AgCl, were repeated adding different concentrations of NH4Cl, in order to observe the behavior of the film as a possible detector of ions NH4+. The peak current for oxidation varies with the concentration of ammonium. A linear region can be observed in the band of 0 to 80 mM, with a sensibility (Sppy) approximately similar to 4,2 mA mM-1 cm-2, showing the efficacy of the electrodes as sensors of ammonium ions. The amount of deposited polymer, controlled by the time of growth, does not influence on the sensor sensibility. The modified electrode was used to determine ammonium in grounded waters.

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Author Biographies

Luciana T. S. Mendes, Universidade Estadual de Londrina

Bacharel em Química - Laboratório de Eletroquímica e Materiais/Depto. Química/CCE/UEL.

Luiz Henrique Dall´Antonia, Universidade Estadual de Londrina

Professor Adjunto – Laboratório de Eletroquímica e Materiais/Depto. Química/CCE/UEL.

Published

2007-07-15

How to Cite

Mendes, L. T. S., & Dall´Antonia, L. H. (2007). Ammonium ions determination with polypyrrole modified electrode. Semina: Ciências Exatas E Tecnológicas, 28(1), 79–86. https://doi.org/10.5433/1679-0375.2007v28n1p79

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Original Article
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