Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/34838
標題: Electrocatalytic oxidation and trace detection of amitrole using a Nafion/lead-ruthenium oxide pyrochlore chemically modified electrode
作者: Zen, J.M.
曾志明
Kumar, A.S.
Chang, M.R.
關鍵字: amitrole
chemically modified electrode
electrocatalysis
lead-ruthenium oxide pyrochlore
Michaelis-Menten kinetics
voltammetric determination
amperometric detection
liquid-chromatography
level determination
surface
aminotriazole
performance
pesticides
reduction
drinking
期刊/報告no:: Electrochimica Acta, Volume 45, Issue 10, Page(s) 1691-1699.
摘要: The Nafion/lead-ruthenium oxide pyrochlore (Pb2Ru1.75Pb0.25O7-y) chemically modified electrode (CME) exhibits an excellent electrocatalytic response towards the amitrole oxidation. It is proposed that the electrochemically active Ru-VI/IV present in the octahedral site of the pyrochlore network mediates the oxidation of amitrole. Rotating disk electrode (RDE) experiments were carried out to evaluate the basic catalytic mechanism on the CME. The occurrence of Michaelis-Menten type kinetics on the CME for the amitrole oxidation reaction was demonstrated and the Michaelis-Menten constant (K-m), electrochemical rate constant (k(e)') and the catalytic rate constant (k(c)) were evaluated. The electrocatalytic behavior is further developed as a sensitive detection scheme for amitrole using both square-wave voltammetry and flow-injection analysis. Under optimized conditions, the calibration curve is linear up to 250 mu M with a detection limit of 0.38 mu M (signal/noise = 3) in square-wave voltammetry. For flow-injection analysis, the linear range is 0-100 mu M with a detection limit of 0.15 ng in 20 mu l of sample. (C) 2000 Elsevier Science Ltd. All rights reserved.
URI: http://hdl.handle.net/11455/34838
ISSN: 0013-4686
文章連結: http://dx.doi.org/10.1016/s0013-4686(99)00327-8
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