The homogeneous electrocatalytic oxidation of hydrazine (HZ) has been studied by indigocarmine (IND) as a mediator at the
surface of TiO2 nanoparticles modified carbon paste electrode (TNMCPE). Cyclic voltammetry was used to study the
electrochemical behavior of IND at different scan rates. The voltammetric response of the modified electrode was linear against
the concentration of HZ in the ranges of 3.0 108–7.0 106 mol/L with differential pulse voltammetry method. The detection
limit (3s) was determined as 27.3 nmol/L. To evaluate the applicability of the proposed method to real samples, the modified CPE
was applied to the determination of HZ in water samples.
