Determination of polynuclear aromatic hydrocarbons by anodic differential pulse voltammetry at the glassy carbon electrode in sulfolane and acetonitrile as solvents

1976 ◽  
Vol 48 (14) ◽  
pp. 2170-2173 ◽  
Author(s):  
J. F. Coetzee ◽  
G. H. Kazi ◽  
J. C. Spurgeon
Keyword(s):  
Differential Pulse Voltammetry ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Aromatic Hydrocarbons ◽  
Differential Pulse ◽  
Polynuclear Aromatic Hydrocarbons ◽  
Carbon Electrode ◽  
Pulse Voltammetry

Determination of Drimarene Blue X-BLN at a glassy carbon electrode by differential pulse voltammetry

2011 ◽  
Vol 76 (12) ◽  
pp. 1765-1773 ◽  
Author(s):  
Abd-Elgawad M. Radi ◽  
Mohammed R. Mostafa ◽  
Reda M. Elshafey ◽  
Talaat A. Hegazy
Keyword(s):  
Differential Pulse Voltammetry ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Supporting Electrolyte ◽  
Differential Pulse ◽  
Redox Couple ◽  
Carbon Electrode ◽  
Validation Parameters ◽  
Pulse Voltammetry

The electrochemical oxidation behaviour of Drimarene Blue X-BLN (DB) has been investigated in phosphate buffers (pH 2.54–10.18) by cyclic and differential pulse voltammetry (DPV) at a glassy carbon electrode (GCE). The oxidation of DB dye generated well-defined pH-dependent two pairs of quasi-reversible anodic-cathodic peak couples. DB exhibited the second redox couple over the entire pH range, while the first redox couple disappeared for pH ≥ 6.70. The redox processes were adsorption-controlled. An electroanalytical method was developed for the determination of DB in phosphate buffer solution (pH 2.85) as supporting electrolyte using DPV. The anodic current heights varied linearly with DB concentrations in the ranges 2 × 10–6–3 × 10–5 and 6 × 10–6–3 × 10–5 mol l–1 with limits of detection (LOD) of 8.7 × 10–7 and 5.7 × 10–7 mol l–1 and limits of quantification (LOQ) of 2.9 × 10–6 and 1.9 × 10–6 mol l–1 for the first and second anodic peaks, respectively. Validation parameters, such as accuracy, precision and recovery were evaluated. The proposed method was successfully applied to the determination of DB in tap water and the analytical results compared well with those obtained by the spectrophotometric method.

scholarly journals L-ARGININE DETERMINATION IN BIOLOGICALLY ACTIVE ADDITIVE BY VOLTAMMETRY

2020 ◽  
Vol 63 (7) ◽  
pp. 4-9
Author(s):  
Valentina A. Popova ◽  
Maria N. Ponomareva ◽  
Elena I. Korotkova
Keyword(s):  
Differential Pulse Voltammetry ◽  
Dietary Supplement ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Differential Pulse ◽  
Biologically Active ◽  
Carbon Electrode ◽  
Scan Rate ◽  
Pulse Voltammetry

This article reports about the electrochemical determination of L-arginine on a glassy carbon electrode in a dietary supplement using anodic differential pulse voltammetry. The exponential depense of the peak current on the square root of the scan rate (I/v1/2), the shifts of the potential to the negative area and linear correlation between peak potential and logarithm of the scan rate (lg(v)) confirms that electrooxidation of L-arginine is an irreversible process. Moreover, the criteria of Semerano equals 0.4 may indicate the process of electrooxidation without adsorption. The effect of pH, accumulation potential, accumulation time and scan rate was tested on electrochemical behavior of L-arginine. Working conditions for L-arginine determination in model media are following: pH 13; Eacc 0.3 V, tacc 30 s; v = 60 mV s-1. A linear dependence of L-arginine electrooxidation current on its concentration was observed at the 0.9 V in the range between 1.0∙10-4 and 10∙10-4 mol l-1. The detection limit was 1.34∙10-6 mol l-1. A comparative determination of L-arginine in dietary supplement was carried out by the voltammetric method and capillary electrophoresis. Thus, the determination of L-arginine in a dietary supplement on a glassy carbon electrode in NaOH solution (pH 13) was successfully carried out using anodic differential pulse voltammetry. The proposed method does not require sample preparation and allows to quickly determine L-arginine in dietary supplement.

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