Electrocatalytic Oxidation of Hydroxylamine on Glassy Carbon Electrodes Modified by Hybrid Copper-Cobalt Hexacyanoferrate Films

Abstract

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 × 10^-3 M to 4.6 × 10^-6 M with a detection limit of 2.1 × 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.