Electrocatalytic Determination of Hydrazine using Glassy Carbon Electrode with Calmagates

Voltammetric methods were used for the determination of hydrazine andinvestigation of its electrochemical behavior on a glassy carbon electrode in thepresence of calmagite as a homogeneous mediator. the key factors considered in theoptimization process were ph, mediator concentration and scan rate. the results showedwith optimizing ph, mediator concentration and scan rate, the convenient selectivity ofpotential and current of hydrazine oxidation can be achieved. calmagite as a mediatorcan catalyze the hydrazine oxidation in an aqueous buffer solution (ph=8.0). theapparent catalytic rate constant, k and diffusion coefficient, d of hydrazine wereobtained as (1.2×104 m-1s-1) and (4.23×10-5cm2 s-1), respectively. the calibration curvewas linear in the rang of 10.0 – 800.0 ?m hydrazine, and the detection limit was 5.3 ?mby linear sweep voltammetry, also differential pulse voltammetric determination ofhydrazine exhibits two linear range of 1.0-20.0 and 40.0-800.0 ?m and detection limitwas 0.8 ?m.