Analytical Sciences

Abstract − Analytical Sciences, 18(5), 543 (2002).

Electrocatalytic Oxidation of Hydroxylamine on Glassy Carbon Electrodes Modified by Hybrid Copper-Cobalt Hexacyanoferrate Films
Xingpin CUI,  Li HONG, and Xiangqin LIN
Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
An electrochemical sensor for amperometric detection of hydroxylamine was developed by electrodeposition of hybrid copper-cobalt hexacyanoferrate films on a glassy carbon electrode. The modified electrode could reduce the overpotential of the hydroxylamine oxidation by about 400 mV. This sensor exhibited a linear relationship between the response current and the hydroxylamine concentration in the range of 1.8 x 10-3 M to 4.6 x 10-6 M with a detection limit of 2.1 x 10-7 M. Good agreement was obtained between results from the present method and conventional UV-visible spectrophotometry results. The sensor had good recovery, stability and anti-interference ability.