University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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Electrode

Classification: Electrode -> film

Citations 1

"Electrostatically Assembled Films For Improving The Properties Of Tetraruthenated Porphyrin-modified Electrodes"
Electroanalysis 1998 Volume 10, Issue 7 Pages 467-471

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Carla M.N. Azevedo, Koiti Araki, Lúcio Angnes, Henrique E. Toma

Abstract: Modified electrodes, suitable for use in flow injection anal., were obtained by the electrostatic assembly of films constituted by 2 different porphyrins, namely, µ-meso(tetrapyridyl)porphyrinatecobalt(III)tetrakis[bis(bipyridine)(chloro)ruthenium(II)] and meso-tetra(4-sulfonatephenyl)porphyrinatezinc(II), forming alternating layers onto glassy carbon surfaces. The films were studied by cyclic voltammetry and proved to be strongly adherent and highly stable. They could be used for at least a week without loss of sensitivity. In addition, they exhibit an enhanced amperometric response and good protection against fouling, e.g., by phenol oxidation products. Their usefulness in flow injection analysis of NO2- and SO32- was demonstrated. Excellent signal to noise ratios were obtained for SO32- down to 10^-6 mol/L, and for NO2- down to 10^-7 mol/L.
Sulfite Nitrite Apparatus Detector