Reza Emamali SABZI, Elnaz MINAIE, Khalil FARHADI, Mir Maqsoud GOLZAN

Nile Blue-hexacyanoferrate carbon paste modified electrode as an amperometric sensor for determination of hydrazine

The main problem associated with metal hexacyanoferrates (MHCFs) is their instability at high pH values. We synthesized a new Prussian Blue analogue, Nile-Blue hexacyanoferrate (NBHCF), that remains stable in 0.2 M KOH. A carbon paste (CPE) chemically modified electrode (ME) containing NBHCF was prepared as a stable electrochemical sensor for measuring hydrazine. A detailed characterization of the electrochemical and electrocatalytic behavior of NBHCF was performed using cyclic voltammetric, chronoamperometric, differential pulse voltammetric (DPV) and hydrodynamic amperometric methods. The NBHCF-modified electrode produced reproducible redox peaks and resulted in a linear increase in the oxidation signal of hydrazine with increasing concentration of hydrazine in the range of 0.1-6.0 mM (in hydrodynamic amperometry method (HDA)). The electrode detection limit was 40 m M and possessed a surface coverage of G = 2.0 \times 10-8 mol cm-2.

Anahtar Kelimeler:

Modified electrode, carbon paste electrode, hexacyanoferrate, amperometric determination of hydrazine, Nile-Blue hexacyanoferrate

Nile Blue-hexacyanoferrate carbon paste modified electrode as an amperometric sensor for determination of hydrazine

Keywords:

Modified electrode, carbon paste electrode, hexacyanoferrate, amperometric determination of hydrazine, Nile-Blue hexacyanoferrate,

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Conclusion This paper describes a novel Prussian Blue analogue, Nile-Blue hexacyanoferrate (NBHCF), that remains stable in 0.2 M KOH. Experimental results have shown that this NBHCF modiŞed electrode was stable in alkaline solutions and exhibited electrocatalytic activity for the oxidation of hydrazine. The detection limit of this sensor was 40 mM and hence it can be used as an amperometric sensor. The sensor was found to be stable with no loss of redox activity even after the prepared electrode was aged in air for 2 weeks. Neﬀ, V. D. J. Electrochem. Soc. 1978, 125, 886-887.
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