scholarly journals On the Mechanism of the Reduction Process of the Hydrogen Ion at the Dropping Mercury Electrode. II. Experimental Part—The Limiting Current of the Hydrogen Wave

1952 ◽  
Vol 25 (5) ◽  
pp. 293-298 ◽  
Author(s):  
Reita Tamamushi
Keyword(s):  
Mercury Electrode ◽  
Reduction Process ◽  
Hydrogen Ion ◽  
Limiting Current ◽  
Experimental Part ◽  
Dropping Mercury Electrode

A NOTE ON THE POLAROGRAPHIC ANALYSIS OF HYDROGEN PEROXIDE

1948 ◽  
Vol 26b (12) ◽  
pp. 767-772
Author(s):  
Paul A. Giguère ◽  
J. B. Jaillet
Keyword(s):  
Hydrogen Peroxide ◽  
Mercury Electrode ◽  
Limiting Current ◽  
Diffusion Current ◽  
Polarographic Analysis ◽  
Dropping Mercury Electrode ◽  
Strychnine Sulphate

The determination of hydrogen peroxide at concentrations higher than those normally covered in polarography was studied with various electrodes. The diffusion current was found to increase linearly with the peroxide concentration up to 0.15% with the dropping mercury electrode and up to nearly 1% with a fixed platinum microelectrode. Under these conditions the limiting current was about 10 times greater than that usually observed. Although the solutions were supersaturated with oxygen, traces of strychnine sulphate were sufficient to suppress all maxima.

Voltametric Behavior of Zopiclone: Polarographic Determination in Tablets

1994 ◽  
Vol 77 (3) ◽  
pp. 768-773 ◽  
Author(s):  
Juan A Squella ◽  
Juan C Sturm ◽  
Alejandro Alvarez-Lueje ◽  
Luis J Núñez-Vergara
Keyword(s):  
Analytical Procedure ◽  
Mercury Electrode ◽  
Reduction Process ◽  
Differential Pulse ◽  
Dosage Forms ◽  
Pharmaceutical Dosage Forms ◽  
Cyclic Voltametry ◽  
Coefficients Of Variation ◽  
Dropping Mercury Electrode ◽  
Weak Adsorption

Abstract Electrochemical reduction of zopiclone at different pHs and concentrations was studied by polarography and cyclic voltametry. Both techniques revealed a reduction process with weak adsorption of both zopiclone and its reduction derivative. Zopiclone exhibited 2 differential pulse polarographic peaks at the dropping mercury electrode. The first peak was used to develop a differential pulse polarographic analytical procedure for determining the drug in pharmaceutical dosage forms. Reproducibility and recovery coefficients of variation were 1.6 and 2.2%, respectively. Analysis of commercial zopiclone tablets showed uniformity in zopiclone content. The method is simple and rapid because separation of excipients is unnecessary.

scholarly journals Characteristics of the dropping mercury electrode below the limiting current

1982 ◽  
Vol 139 (2) ◽  
pp. 275-283 ◽  
Author(s):  
Richard Pollard ◽  
Wan P. Kwan ◽  
Clarence G. Law
Keyword(s):  
Mercury Electrode ◽  
Limiting Current ◽  
Dropping Mercury Electrode

scholarly journals Reduction of Cd(II) Ions in the Presence of Tetraethylammonium Cations. Adsorption Effect on the Electrode Process

Electrochem ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 415-426
Author(s):  
Juan Torrent-Burgués
Keyword(s):  
Mercury Electrode ◽  
Reduction Process ◽  
Inhibitory Effect ◽  
Electrode Process ◽  
Adsorption Effect ◽  
A Value ◽  
Half Wave ◽  
Dropping Mercury Electrode ◽  
Electrode Coverage ◽  
Isotherm Equations

The effect of the adsorption of tetraethylammonium (TEA) cations, which present both ionic and organic characteristics, on the reduction of Cd(II) ions have been studied from dc and ac measurements at the dropping mercury electrode. The resistance to the charge transfer (Rct) and Warburg coefficient (σ) parameters have been determined through impedance measurements. Thus, the global velocity constant has been obtained. The reduction process of Cd(II) in perchloric media is reversible and is affected by the adsorption of TEA cations, especially at high TEA concentrations. Values of E1/2, half wave potential, and DO, diffusion coefficient, obtained from both dc and ac measurements agree. The velocity constants show a decrease as TEA concentration increases, with values ranging from 0.6 to 0.01 cm·s−1. The inhibitory effect of TEA adsorption on the electrode process and the relationship between electrode coverage, θ, and velocity constants, K, using several isotherm equations, have been discussed. The best fit was obtained with the equation K = 0K(1 − θ)a with an a value close to three, indicating a blocking effect and electrostatic repulsion due to TEA.

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