UV-Visible Reflection Absorption Spectroscopy in the Presence of Convective Flow

Ming Zhao, Daniel Alberto Scherson

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Abstract

A spectroelectrochemical technique is herein described in which the surface of a rotating disk electrode is used as a mirror to reflect a focused beam of Hght in the UV-vis range at a near normal incidence angle. This approach makes it possible to probe quantitatively the presence of absorbing species in the diffusion boundary layer under well-defined hydrodynamic conditions. Good agreement between theory and experiments was obtained using the oxidation of Fe(CN)6 4-as a model system. In particular, the absorbance difference at the diffusion limiting current was found to be proportional to the reactant concentration, cR, for a fixed rotation rate, ω, and proportional to ω-1/2for a fixed cR.

Original languageEnglish
Pages (from-to)3064-3067
Number of pages4
JournalAnalytical chemistry
Volume64
Issue number23
DOIs
Publication statusPublished - 1992 Jan 1
Externally publishedYes

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ASJC Scopus subject areas

  • Analytical Chemistry

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