Electroanalytical determination of 4-nitrophenol by square wave voltammetry on diamond electrodes

Autor(es)

Valber de A. Pedrosa ^[1] ; Lúcia Codognoto ^[2] ; Luis Alberto Avaca ^[3]

Afiliação do(s) autor(es)

^[1] Universidade de São Paulo. Instituto de Química de São Carlos - Brasil

^[2] Universidade de São Paulo. Instituto de Química de São Carlos - Brasil

^[3] Universidade de São Paulo. Instituto de Química de São Carlos - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 14, n. 4, p. 530-535, 2003-08-00.

Resumo

The anodic voltammetric behavior of 4-Nitrophenol on a Boron-doped diamond electrode in aqueous solution has been studied using square wave voltammetry. After optimization of the experimental conditions, that model molecule was analyzed in pure water solutions using a Britton-Robinson buffer with pH 6.0 as the supporting electrolyte. Oxidation occurs at 1.0 V vs. Ag/AgCl in an irreversible two-electron process controlled by adsorption of the species. The detection limit (DL) obtained was 2.8 mug L-1. This result was comparable to that obtained from reduction of the molecule at -0.8 V vs. Ag/AgCl under the same experimental conditions (DL = 4.2 mug L-1). Both DL values are within the limits required by the legislation for drinking water (30 mug L-1). The combination of square wave voltammetry and diamond electrodes has proved to be an interesting and desirable alternative for the analytical determination of organic molecules. (AU)

• Processo FAPESP: 99/08050-8 - Desenvolvimento de métodos eletroquímicos para a detecção e eliminação de pentaclorofenol em águas residuárias
• Beneficiário: Lucia Codognoto de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 01/08626-9 - Estudo de interferentes organicos e inorganicos nas medidas eletroanaliticas de poluentes organoclorados usando eletrodos de diamante.
• Beneficiário: Valber de Albuquerque Pedrosa
• Modalidade de apoio: Bolsas no Brasil - Mestrado