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Electrocatalytic oxidation of ascorbic acid at chemically modified electrodes
Author(s) -
Kulys Juozas,
Drungiliene Alms
Publication year - 1991
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.1140030312
Subject(s) - ascorbic acid , tetracyanoquinodimethane , electrode , chemistry , redox , ferrocene , tetrathiafulvalene , inorganic chemistry , aqueous solution , electrochemistry , electrocatalyst , graphite , organic chemistry , molecule , food science
Electrocatalytic oxidation of ascorbic acid (AA) in aqueous buffer solution at the p ‐tetracyanoquinodimethane (TCNQ)‐, ferrocene (Fc)‐, 1,1′‐dimethylferrocene (DMFc)‐, and tetrathiafulvalene (TTF)‐modified graphite electrodes is carried out at each modifier's redox potentials. Over the linear range of current dependence on AA concentration, the sensitivity of the electrocatalytic systems corresponds to up to 0.1 A/M. At pH 6.5–8.0 a change in the electrocatalytic process rate is less evident (for TCNQ, TTF) or is increased by a factor of 4.9 (DMFc). The electrocatalytic current is only slightly dependent on electrode rotation speed. The electrodes retain about 80% of their initial response over a 2‐month period of operation.