Author/Authors :
Mazloum-Ardakani ، Mohammad نويسنده Department of Chemistry, Faculty of Science, Yazd University, Yazd, I.R. Iran , , Sadeghiane، Ali نويسنده Department of Chemistry, Payam Noor University, Ardakan Center, Ardakan, Iran , , Moosavizadeh، Seyed Hossein نويسنده Department of Chemistry, Faculty of Science, Payam Noor University, Sirjan Center, Sirjan, Iran , , Karimi، Mohammad Ali نويسنده , , Mashhadizadeh، Mohammad Hossein نويسنده Department of Chemistry, Tarbiat Moallem University of Tehran, Tehran, I.R. Iran ,
Abstract :
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.
