Electrochemical behavior hydrazine at a modified glassy carbon electrode by pyrazole drivative

Hydrazine is the simplest diamine, a highly reactive base, and a reducing agent. Hydrazine and its derivatives are broadly utilized in applications including fuel cells, catalysts, blowing agents, corrosion inhibitors, antioxidants, pharmaceutical intermediates, pesticides, plant-growth regulators, and dyes in addition to their use as starting materials in the synthesis of some insecticides and photography materials [1]. Moreover, hydrazine is a high energy molecule which can be used as a fuel in explosives and rocket propulsion systems [2]. Despite the widespread use of hydrazine and its derivatives in various fields, they are highly toxic and their exposure to human could cause a serious damage to the central nervous system, liver, lungs and kidneys [3]. Therefore, simple, sensitive and selective monitoring of hydrazine and its derivatives is a vital of interest in different industries [4].In this paper, pyrazole derivative (P), was prepared and used to modification of glassy carbon electrode (GCE) to determination of hydrazine. The voltammetric oxidation of hydrazine was investigated at a P/GCE electrode using cyclic voltammetry (CV), differential pulse voltammetry (DPV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS). The oxidation process was irreversible over the pH range studied (pH 4-11) and exhibited a diffusion-controlled behavior. In the range of 0.5 × 10-6 to 1.6 × 10-3 M, the current measured by differential pulse voltammetry presents a good linear property as a function of the concentration of hydrazine with a detection limit of 75 nM with good selectivity and sensitivity. The modified electrode showed good stability and repeatability.