Electrochemical study of butylate: application to the analysis of water

• Tipo: Artigo em Revista Científica Internacional
• Data: 2008

Autores

Barroso, MF (Autor) Outra; Delerue Matos, C (Autor) Outra; Vaz, MCVF (Autor) Outra; Sales, MGF (Autor) Outra

Revista

Título: International Journal of Environmental Analytical Chemistry

Vol. 88

Páginas: 1049-1062

ISSN: 0306-7319

Editora: Taylor & Francis

Indexação

ISI Web of Knowledge - 2 Citações

Scopus - 1 Citação

Outras Informações

ID Authenticus: P-004-3NN

DOI: 10.1080/03067310802474905

Abstract (EN): 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 +1.7 V versus AgCl/Ag, an irreversible process controlled by diffusion. Using a HMDE, a single cathodic peak is observed, at -1.0 V 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 mu mol L(-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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 14