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Determination of hydrogen peroxide by utilizing a cobalt( II )hexacyanoferrate‐modified glassy carbon electrode as a chemical sensor
Author(s) -
Lin Meng Shan,
Jan Bor Iuan
Publication year - 1997
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.1140090416
Subject(s) - cobalt , hydrogen peroxide , ascorbic acid , chemistry , inorganic chemistry , detection limit , electrode , electrochemical gas sensor , glassy carbon , nuclear chemistry , electrochemistry , cyclic voltammetry , organic chemistry , chromatography , food science
A mixed‐valence cluster of cobalt(II)hexacyanoferrate possesses an electron transfer property and is suitable for the development of an effective hydrogen peroxide detection scheme. The characteristics of cobalt(II)hexacyanoferrate have been studied using both elemental analysis and infrared spectra, confirming the structure is Co 2 II [Fe II (CN) 6 ]. The cobalt(II)hexacyanoferrate‐modified electrode exhibits a rapid response ( t 95% ‐ 6.5 s) to the injection of 5.0 × 10 −5 M hydrogen peroxide. The linearity of the response is up to 1.1 × 10 −3 M (correlation coefficients is 0.999). The sensitivity of this modified electrode is 11.8 μA/mM‐mm 2 . The detection limit of cobalt(II)hexacyanoferrate‐modified electrode to hydrogen peroxide is 6.25 × 10 −8 M. The current chemical sensor modified with Co 2 II [Fe II (CN) 6 ] has better sensitivity than previous ones. The modified glassy carbon electrode shows no interference from ascorbic acid, uric acid, acetaminophen, 1,4‐dihydroxyquinone, dopamine at the 2.0 × 10 −4 M level and polyamines at 5.0 × 10 −5 M level.