On the Electro-catalytic Reduction of 2,4,6-Trinitrophenol at the Glassy Carbon Electrode Modified with Analogous Prussian Blue Film Doped with Europium(Ⅲ) Ion

A glassy carbon electrode modified with analogous prussian blue film doped with Eu3+ ion was prepared and the electrochemical behavior of 2,4,6-trinitrophenol at the modified carbon glassy electrode was studied.It was shown by the experimental results,as compared with the use of bare glassy carbon electrode,remarkable raising of reductive peak current,lowering of reductive potential and broadening of range of working curve of 2,4,6-trinitrophenol were observed at the modified electrode.Based on these facts,a sensitive method for direct determination of 2,4,6-trinitrophenol by voltammetry was proposed.Linear relationships between values of characteristic reductive current and concentration of 2,4,6-trinitrophenol were obtained in the ranges of 4.0×10-5 to 2.0×10-3mol·L-1 and 2.0×10-7 to 8.0×10-6mol·L-1,with its detection limit (3σ) of 6.0×10-8mol·L-1.By taking water sample from the Huanghe river as matrix,recovery of the method was tested by standard addition method,giving values of recovery in the range from 97.7% to 103.3%.