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Electrochemical oxidation of 5‐hydroxytryptamine and 5‐hydroxyindoleacetic acid by integrated pulse linear scan voltammetry at ultrasmall gold ring electrodes
Author(s) -
Lau Yau Yi,
Wong Danny K. Y.,
Luo Guoan,
Ewing Andrew G.
Publication year - 1992
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140040907
Subject(s) - electrode , electrochemistry , cyclic voltammetry , voltammetry , materials science , desorption , analytical chemistry (journal) , adsorption , chemistry , inorganic chemistry , chromatography , organic chemistry
Ultrasmall gold ring electrodes have been constructed by electrodeposition of gold onto carbon ring electrodes. Electrodes thus formed show similar adsorption/desorption peaks for oxygen in H 2 SO 4 solution compared to those obtained at conventional‐sized electrodes. These electrodes have been used in conjunction with linear scan voltammetry and subsequent cleaning pulses to obtain repeatable quantitative results for the electochemical oxidation of 5‐hydroxytrptamine and 5‐hydroxyindoleacetic acid. This technique involves the use of a linearly scanned applied potential, followed by a large positive potential to clean the electrode oxidatively and negative potential for electrode activation. The result of the cleaning pulses is that oxidation products of 5‐hydroxytryptamine are cleaned off the electrode and reproducible voltammograms are obtained.