Fabrication of a micro-macro composite electrode used for voltammetric determination of dopamine in the presence of ascorbic acid.

OHMORI Hidenobu, OHMAE Hiroshi, UEDA Chihiro

doi:10.2116/bunsekikagaku.40.3_137

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ミクロ‐マクロ複合電極の試作とそれを用いるボルタンメトリーによるアスコルビン酸共存下でのドーパミンの定量
ミクロマクロフクゴウデンキョクノシサクトソレオモチイルボル
ミクロ-マクロ複合電極の試作とそれを用いるボルタンメトリーによるアスコルビン酸共存下でのドーパミンの定量

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Abstract

A composite plane electrode has been fabricated by compressing a micro-electrode (MiE; 25μmφ) between two macro-electrodes (MaE: area, ca. 0.08cm²×2) placed in close proximity to each other. Voltammetry of ferrocyanide ion in aqueous solution at the composite electrode indicated that the environment of the MiE can be controlled by a potential applied to the MaE. Thus, when the MaE was kept at a potential well anodic to the oxidation of Fe(II), the voltammetric current observed by sweeping the potential of the MiE from -0.20V (vs. Ag/AgCl) to anodic direction was primarily composed of the reduction of Fe(III) instead of the oxidation of Fe(II). One application of the composite electrode was the analysis of dopamine (>0.5 mM) in aqueous solution containing ascorbic acid (10mM). By keeping the potential of the MaE at an appropriate value, the ascorbic acid was selectively removed from the surface of the MiE and the dopamine was determined at the latter electrode by differential pulse voltammetry.

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BUNSEKI KAGAKU

BUNSEKI KAGAKU 40 (3), 137-141, 1991

The Japan Society for Analytical Chemistry

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