Preparation of Electrode Modified with Analogous Prussian Blue Film Doped with Copper(II) Ion by Electrochemistry and Determination of NO_2~- on Electrode
The analogous Prussian blue modified film doped with Cu2+ ion (Cu-PB) was prepared by mixing Cu2+ ion in Prussian blue modified film (PB) using electrochemistry means.The Cu-PB film's electrochemical properties and response characteristics on NO-2 were investigated by using the cyclic voltammetry and A.C.impedance.The experimental results showed that internal structure of PB film was changed and its electrochemistry performance also had the obvious change after mixing Cu2+ ion.Further experiment indicated that there was no electro-catalytic action to NO-2 on the PB modified film,but with obvious electro-catalytic action on the Cu-PB modified film.Linear relationships between values of reductive peak current and concentration of NO-2 were obtained in the ranges of 1.0×10-2 to 5.0×10-5 mol/L (r=0.9983),with a detection limit (S/N=3) of 1.0 ×10-6 mol/L in PBS cushion solution (pH=5.85).The proposed method was employed in determining the real samples with recoveries of 97.5%-104.0%