Comparison of direct current, derivative direct current, pulse and square wave voltammetry at single disc, assembly and composite carbon electrodes: stripping voltammetry at thin film mercury microelectrodes with field-based instrumentation

The Analyst ◽  
1998 ◽  
Vol 123 (6) ◽  
pp. 1333-1337 ◽  
Author(s):  
Alan M. Bond ◽  
W. Alexander Czerwinski ◽  
Marissa Llorente
Keyword(s):  
Thin Film ◽  
Current Pulse ◽  
Direct Current ◽  
Square Wave Voltammetry ◽  
Stripping Voltammetry ◽  
Carbon Electrodes ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Current Derivative ◽  
Composite Carbon

Voltammetry of resazurin at a mercury electrode

2010 ◽  
Vol 64 (3) ◽  
Author(s):  
Semiha Çakir ◽  
Emine Arslan
Keyword(s):  
Square Wave Voltammetry ◽  
Mercury Electrode ◽  
Stripping Voltammetry ◽  
Cathodic Reduction ◽  
Reduction Peak ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Reduction Mechanisms ◽  
Electrochemical Parameters ◽  
Catalytic Hydrogen

AbstractElectrochemical behavior of resazurin on HMDE in Britton-Robinson (B-R) buffers (pH 2.0–10.0) was studied using the square-wave voltammetry (SWV), square-wave adsorptive stripping voltammetry (SWAdSV), and cyclic voltammetry (CV) techniques. The voltammogram of resazurin in B-R buffer at pH < 4.0 exhibited two cathodic reduction peaks. The voltammetric peaks were obtained at −0.144 V (reversible) and −1.250 V (irreversible) at pH 3.2, and correspond to the reduction of resorufin to dihydroresorufin and to the catalytic hydrogen wave, respectively. At pH > 4.0, a new irreversible cathodic reduction peak, assigned to the protonation of N-oxide on the phenoxazin ring, was observed. Electrochemical parameters (I p/E p, I p/v, I p/pH, I p/t acc) of the compound were determined. From the voltammetric data, electrochemical reduction mechanisms for all peaks have been suggested. Maximum peak current for the reversible peak was obtained at pH 4.1. A linear relationship between the current and concentration was determined, and also the lowest detection limit was found as 3.25 × 10−8 mol L−1 and 1.98 × 10−10 mol L−1 for SWV and SWAdSV, respectively.

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