Electrochemical study and flow-injection amperometric detection of trace NO(2)(-) at CuPtCl(6) chemically modified electrode.
A thin film of mixed-valent CuPtCl(6) is deposited on a glassy carbon electrode by continuous cyclic scanning in a solution containing 3x10(-3) M CuCl(2)+3x10(-3) M K(2)PtCl(6)+1 M KCl in the potential range from 700 to -800 mV. The cyclic voltammetry is used to study the electrochemical behaviors of nitrite on CuPtCl(6)/GC modified electrode and the electrode displays a good catalytic activity toward the oxidation of nitrite. The effects of the film thickness, pH, the electrode stability and precision have been evaluated. Experiments in flow-injection analysis are performed to characterize the electrode as an amperometric sensor for the detection of nitrite. The modified electrode shows a wide dynamic range, quite a low detection limit and short response time. The linear relationship between the flow-injection peak currents and the concentrations of nitrite is at a range of 1x10(-7)-2x10(-3) M with a detection limit of 5x10(-8) M.
Pei
J
J
Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
Li
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