Electrocatalytic Determination of Hydrazine using Glassy Carbon Electrode with Calmagates

Voltammetric methods were used for the determination of hydrazine and investigation of its electrochemical behavior on a glassy carbon electrode in the presence of calmagite as a homogeneous mediator. The key factors considered in the optimization process were pH, mediator concentration and scan rate. The results showed with optimizing pH, mediator concentration and scan rate, the convenient selectivity of potential and current of hydrazine oxidation can be achieved. Calmagite as a mediator can catalyze the hydrazine oxidation in an aqueous buffer solution (pH=8.0). The apparent catalytic rate constant, k and diffusion coefficient, D of hydrazine were obtained as (1.2×104 M-1s-1) and (4.23×10-5cm2 s-1), respectively. The calibration curve was linear in the rang of 10.0 – 800.0 ?M hydrazine, and the detection limit was 5.3 ?M by linear sweep voltammetry, also differential pulse voltammetric determination of hydrazine exhibits two linear range of 1.0-20.0 and 40.0-800.0 ?M and detection limit was 0.8 ?M.