RESUMO
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.
RESUMO
The study on the in-situ FTIR spectroelectrochemistry of a hybrid copper-cobalt hexacyanoferrate film modified platinum electrode was carried out. The variation of the FTIR spectra was well correlated to the redox process of CuCoHCF. The relative contribution of Cu(II) and Co(II) to the stretching vibration of CN was found to vary with the applied potential.