Chrono-amperometric Determination of Hydrogen Peroxide with Calixarene Modified Carbon Fiber Electrode

The modified electrode was prepared by electrodeposition of a film of calixarene on the surface of carbon fiber electrode at the potential range from -0.4 to 0.6 V (vs.SCE) from a solution of 8.0×10-4mol·L-1 calixarene dissolved in 0.1 mol·L-1 tetrabutyl ammonium perchlorate.The surface property of the calixarene modified CFE were studied by scanning electron microscopy and AC impedance method,and its electrochemical property studied by cyclic voltammetry and chronoamperometry.It was found that the calixarene modified CFE showed a remarkable oxidation peak of hydrogen peroxide at the potential of 0.6 V (vs.SCE).Based on these findings,a selective method for determination of hydrogen peroxide by chronoamperometry was proposed.Under the optimized experimental conditions,linear relationship between values of oxidation peak current and concentration of hydrogen peroxide was obtained in the range of 1.5×10-5-3.8×10-3mol·L-1,with its detection limit (3S/N) of 5.0×10-6mol·L-1.The proposed method was used in the determination of hydrogen peroxide in medical sterilizing water,the result obtained was conformed to that found by permanganate titration.The values of recovery found by standard addition method were in the range of 97%-104%,and value of RSD (n=10) found was 4%.