Electrochemical study of butylate: application to the analysis of water

Barroso, M. Fátima; Ramalhosa, Maria João; Delerue-Matos, Cristina; Sales, M. Goreti F.

http://hdl.handle.net/10400.22/2953

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Authors

Barroso, M. Fátima

Ramalhosa, Maria João

Delerue-Matos, Cristina

Sales, M. Goreti F.

Abstract(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.

Keywords

Butylate Voltammetry Glassy carbon electrode Hanging mercury drop electrode

URI

http://hdl.handle.net/10400.22/2953

Publisher

Taylor & Francis

DOI

10.1080/03067310802474905

Collections

ISEP – GRAQ – Artigos

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