Simultaneous Determination of Phenylhydrazine, Hydrazine and Sulfite Using a Modified Carbon Nanotube Paste Electrode

A sensitive and selective electrochemical method for the determination of phenylhydrazine (PH) was developed using a modified carbon nanotube paste electrode. It has been found that under the optimum condition (pH 5.0) in cyclic voltammetry, the oxidation of PH occurred at a potential of about 250 mV on the surface of the modified electrode. The linear range of 0.6 to 900.0 μM and a detection limit of 1.31 × 10-7 M were observed for PH in optimum conditions. The modified electrode showed an excellent character for electrocatalytic oxidization of PH, hydrazine (HZ) and sulfite (ST). Finally, this method was also examined as a selective, simple and precise electrochemical sensor for the determination of PH, HZ and ST in real samples such as urine and water samples.