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Titolo:
Microwave activation of electrochemical processes: Square-wave voltammetric stripping detection of cadmium in the presence of the surfactant triton X
Autore:
Tsai, YC; Coles, BA; Compton, RG; Marken, F;
Indirizzi:
Univ Oxford, Phys & Theoret Chem Lab, Oxford OX1 3QZ, England Univ OxfordOxford England OX1 3QZ ret Chem Lab, Oxford OX1 3QZ, England
Titolo Testata:
ELECTROANALYSIS
fascicolo: 8-9, volume: 13, anno: 2001,
pagine: 639 - 645
SICI:
1040-0397(200105)13:8-9<639:MAOEPS>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
MERCURY FILM ELECTRODE; REACTION ENTROPIES; REDOX COUPLES; MICROELECTRODES; VOLTAMMOGRAMS; TEMPERATURE; TRANSITION; SYSTEMS;
Keywords:
voltammetry; microwave; mercury; microelectrode; thermal activation; thermal gradient; hot spot; convection; surfactants;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Marken, F Loughborough Univ Technol, Dept Chem, Loughborough LE11 3TU, Leics, England Loughborough Univ Technol Loughborough Leics England LE11 3TU d
Citazione:
Y.C. Tsai et al., "Microwave activation of electrochemical processes: Square-wave voltammetric stripping detection of cadmium in the presence of the surfactant triton X", ELECTROANAL, 13(8-9), 2001, pp. 639-645

Abstract

A novel electrochemical cell based on a flow through system in a microwavecavity is shown to allow voltammetric experiments under microwave conditions. Focusing of the microwave radiation at the electrode-solution (electrolyte) interface creates conditions of extreme localized heating with an inverted thermal gradient within the diffusion layer of the electrode and convective flow. The deposition and anodic stripping detection by square-wave voltammetry of Cd2+ in a 0.1 M acetate buffer solution is shown to he strongly enhanced by microwave activation. The temperature at the electrode-solution interface is calibrated with the reversible redox couple Ru(NH3)(6)(3-/2) in 0.1 M acetate buffer. The effect of microwave activation on the square-wave voltammetry responses for the reduction of Ru(NH3)(6)(3+) and for the detection of Cd2+ in 0.1 M acetate buffer solution are studied. In the presence of a nonionic surfactant, Triton X-100, which blocks the electrochemical Cd2+ response under conventional conditions. microwave activation is shown to have a considerable effect in enhancing the sensitivity for Cd2+ detection.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/04/20 alle ore 00:03:40