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Electrochemical study of butylate: application to the analysis of water
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Orientador(es)
Resumo(s)
The electroactivity of butylate (BTL) is studied by cyclic voltammetry (CV) and
square wave voltammetry (SWV) at a glassy carbon electrode (GCE) and
a hanging mercury drop electrode (HMDE). Britton–Robinson buffer solutions
of pH 1.9–11.5 are used as supporting electrolyte. CV voltammograms using GCE
show a single anodic peak regarding the oxidation of BTL at +1.7V versus AgCl/
Ag, an irreversible process controlled by diffusion. Using a HMDE, a single
cathodic peak is observed, at 1.0V versus AgCl/Ag. The reduction of BTL is
irreversible and controlled by adsorption. Mechanism proposals are presented for
these redox transformations. Optimisation is carried out univaryingly. Linearity
ranges were 0.10–0.50 mmol L-1 and 2.0–9.0 µmolL-1 for anodic and cathodic
peaks, respectively. The proposed method is applied to the determination of BTL
in waters. Analytical results compare well with those obtained by an HPLC
method.
Descrição
Palavras-chave
Butylate Voltammetry Glassy carbon electrode Hanging mercury drop electrode
Contexto Educativo
Citação
Editora
Taylor & Francis