Orbital - Vol. 7 No. 2 - April-June 2015
FULL PAPERS

Eletrodo Modificado com [CoO(OH)] Coloidal Aplicado na Detecção de Ácido Oxálico

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  • Andréia Stadnik,
  • Elisângela M. Caldas,
  • Andressa Galli,
  • Fauze J. Anaissi
Andréia Stadnik
Universidade Estadual do Centro-Oeste do Paraná
Elisângela M. Caldas
Universidade Federal do Rio Grande do Sul
Andressa Galli
Universidade Estadual do Centro-Oeste do Paraná
Fauze J. Anaissi
Universidade Estadual do Centro-Oeste, UNICENTRO-PR
Published June 25, 2015
Keywords
  • cobalt oxy-hydroxide,
  • electrochemical techniques,
  • detection,
  • oxalic acid
How to Cite
(1)
Stadnik, A.; Caldas, E. M.; Galli, A.; Anaissi, F. J. Eletrodo Modificado Com [CoO(OH)] Coloidal Aplicado Na Detecção De Ácido Oxálico. Orbital: Electron. J. Chem. 2015, 7, 122-130.

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Abstract

In this work, we used a chemically modified electrode with cobalt oxyhydroxide in colloidal form as an electrochemical sensor for oxalic acid. Initial experiments were performed in different electrolytes (LiOH, NaOH e KOH), that better defined electrochemical response in medium NaOH solution [0.5 mol.L-1]. From measurements of cyclic voltammetry and square wave voltammetry for quantification of oxalic acid responses electroanalytical was obtained for concentrations in order 10-5-10-6 mol L-1. The detection limits (2.52x10-5 mol.L-1) and quantification (7.55x10-6 mol.L-1) were significantly better for measurements performed by square wave voltammetry. The CME-Co has potential application as a sensor for the measurement of oxalic acid and redox species.

DOI: http://dx.doi.org/10.17807/orbital.v7i2.572

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