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Voltammetric Behavior of Nitrofurazone at Highly Boron Doped Diamond Electrode
Author(s) -
Sérgio da Silva Julião Murilo,
Almeida Érica Cristina,
Aquiles La Scalea Mauro,
Ferreira Neidenêi Gomes,
Compton Richard G.,
Pires Serrano Sílvia Helena
Publication year - 2005
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200403093
Subject(s) - hydroxylamine , chemistry , cyclic voltammetry , electrochemistry , inorganic chemistry , electrode , derivative (finance) , electroanalytical method , potentiometric titration , organic chemistry , financial economics , economics
The electrochemical behavior of nitrofurazone (NFZ) at a highly boron doped diamond (BDD) electrode was studied in Britton‐Robinson (BR) buffer using cyclic voltammetry. NFZ was directly reduced to the amine derivative (RNH 2 ) in the pH range of 2.0 to 4.0 in a process involving six (6.0±0.4) electrons and six protons. In the range of pH 7.0 to 12 and, predominantly aqueous medium, the reduction step split into its two components: the reduction of NFZ to the radical anion (RNO 2 .− ) and reduction of RNO 2 .− to hydroxylamine derivative (RNHOH) in processes involving one and three (3.1±0.1) electrons, respectively. On the anodic scan of the voltammograms and at pH 8.0, the oxidation of the hydroxylamine to the nitroso derivative (RNO), was observed in a process involving 2 (1.7±0.2) electrons and 2 protons. In addition and unreported in the literature on any electrode material, was the detection of a new oxidation peak at pH>8.0, which was observed regardless of whether NFZ had been previously reduced or not. The calculation of n , number of electrons, involved in each electrochemical step was satisfactorily accomplished using the Randles‐Ševcik equation.