Electrocatalytic oxidation of hydrazine with alizarin red S as a homogenous mediator on the glassy carbon electrode

Abstract

Electro-catalytic oxidation and detection of hydrazine on a glassy carbon electrode, at pH 6.0, was studied by using alizarin red S as a homogeneous mediator. The overall number of electrons involved in the catalytic oxidation of hydrazine and that involved in the rate-determining step were four and one, respectively. The interfering effect of some cations, anions and organic compounds were examined. Peak current for this process varied linearly with the square root of the scan rate. The kinetic parameters, such as the electron transfer coefficient (  ) and catalytic rate constant (k), were determined using cyclic voltammetry, linear sweep voltammetry and chronoamperometry. The electro-catalytic response was optimized with regards to the pH, scan rate, hydrazine concentration and other variables. alizarin red S, hydrazine, glassy carbon electrode, electro-catalytic oxidation, voltammetry

Electrochemical Characterization and Electrocatalytic Application of Gold Nanoparticles Synthesized with Different Stabilizing Agents

“…Hydrazine ( pK a =8.23 ), is oxidized mainly through process, with N 2 as the final product in aqueous solution . Also, it is highly dependent on the surface structure of the electrode, which affects the electrocatalysis of the reaction .…”

Highly Selective Molecularly Imprinted Polymer Sensor for Indium Detection Based on Recognition of In‐Alizarin Complexes

“…CV curves of ARS were obtained in 0.2 mol/L HAc‐NaAc buffer solution, a pair of reversible redox peaks was found at −0.14 V and −0.18 V (Inset Figure 2). The electrochemical activity group is anthraquinone in ARS, which was reduced from quinoid to quinol form in the electrode reduction process 25. Consequently, the potential range of electropolymerization should be avoided from the redox potential range of ARS.…”

“…Metal ion complexes together with functional monomer were also used in preparing MIPs 22–24. But, after the elution of metal ions or sometimes parts of ligands, the cavities left in MIP made the rebinding of metal ions only by form chemical bonds between the metal ions and functional groups in cavities 25. The recognition ability of the cavities to the templates relied on the characters of the bonds, which was restricted due to the certain degree of similarity in polarity of the M n + O(N) bond.…”

Electrochemical Sensor for Detection of Gallic Acid Based on Carmine Modified Platinum Electrode: Application in Estimation of Total Polyphenols in Onion Powder Samples

“…Carmine electrochemical deposition was accomplished by employing cyclic voltammetric scanning on a platinum electrode in a 0.5 M H 2 SO 4 solution containing 1.0mM carmine. The scanning range extended from − 0.2 to 0.6 V for various cycle numbers (20,30,40, and 50) using fast-scan cyclic voltammetry at a xed scan rate of 100 mV/s. Following this process, the resulting modi ed carmine platinum electrode was subsequently washed with distilled water and stabilized by subjecting it to scans between − 0.2 to 0.6 V at a rate of 50 mV/s in a 0.5 M H 2 SO 4 solution devoid of carmine, until a stable voltammogram was achieved.…”

“…Organic dyes, such as methylene blue, neutral red, and alizarin red S utilized for electrode modi cation and its applications in the analysis of organic compounds [27]. Carmine exhibits similar properties to other dyes and works as a redox mediator in the direct application of electroanalysis [28][29][30].…”