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BIBTEX RIS

Catálise eletroquímica da redução do bromato em superfícies modificadas por filmes de molibdênio

1998; Brazilian Chemical Society; Volume: 21; Issue: 2 Linguagem: Inglês

10.1590/s0100-40421998000200012

ISSN

1678-7064

Autores

Mauro Bertotti, Derek Pletcher,

Tópico(s)

Electrochemical Analysis and Applications

Resumo

A MOLYBDENUM OXIDE MODIFIED ELEC-TRODE.In this paper some studies concerning the electroreduction of Mo(VI) in sulphuric acid solutions are described.We have shown that at suitable experimental conditions very stable molybdenum oxide films can be electrochemically deposited at glassy carbon electrodes, the reduction of bromate occurring at less negative potentials on the modified surface.Coulometric experiments have shown that bromide is not the only product of the catalytic bromate reduction by the molybdenum film and species like BrO 2 may have part in this process.Based on chronoamperometric curves recorded at -0.60 V, analytical curves have been obtained for the reduction of bromate in the 0.1 -0.8 mM range, a limit of detection of 20 µM for bromate being determined.

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