Flow injection amperometric determination of hydrazine based on its electrocatalytic oxidation at pyrocatechol violet modified pencil graphite electrode


AYAZ S. , DİLGİN Y.

Electrochimica Acta, vol.258, pp.1086-1095, 2017 (Journal Indexed in SCI Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 258
  • Publication Date: 2017
  • Doi Number: 10.1016/j.electacta.2017.11.162
  • Title of Journal : Electrochimica Acta
  • Page Numbers: pp.1086-1095
  • Keywords: Pencil graphite electrode, Modified electrode, Hydrazine, Amperometry, Pyrocatechol violet, Flow injection analysis, GLASSY-CARBON ELECTRODE, TANDEM MASS-SPECTROMETRY, VOLTAMMETRIC DETERMINATION, ELECTROCHEMICAL SENSORS, DRINKING-WATER, NANOPARTICLES, NANOTUBES, ACID, FILM, CARCINOGENICITY

Abstract

© 2017 Elsevier LtdA disposable, low cost, commercial available electrode, Pencil graphite electrode (PGE), was modified with pyrocatechol violet (Pcv) for electrocatalytic oxidation of hydrazine. To prepare modified electrode, pencil leads were immersed into 0.01 M Pcv solution for 10 min at room temperature. Cyclic voltammetric experiments show that a broadened and highly irreversible peak attributed to oxidation of N2H4 was observed at 600 mV at the bare PGE, while a well-defined irreversible oxidation peak was observed at 100 mV at the Pcv/PGE. A shift in the overpotential to more negative direction (about 500 mV) and an enhancement in the peak current indicate that the Pcv/PGE presents an efficient electrocatalytic activity toward oxidation of hydrazine. Then, flow injection analysis (FIA) of N2H4 was performed based on its electrocatalytic oxidation at the Pcv/PGE. The recorded amperometric current-time curves in FIA under optimized conditions showed a linear dependence on the N2H4 concentration between 2.5 × 10−4 mM and 0.50 mM with a detection limit of 0.08 μM. This proposed modified electrode exhibits a simple, disposable, low cost, rapid and sensitive determination of hydrazine.