Kinetic and electrochemical analysis of Ni(II) reduction at the dropping mercury electrode in the presence of thiourea

1991 ◽  
Vol 69 (4) ◽  
pp. 599-605 ◽  
Author(s):  
Rosa M. Villamañán ◽  
Fernando Mata-Pérez
Keyword(s):  
Key Words ◽  
Rate Constant ◽  
Reaction Mechanisms ◽  
Mercury Electrode ◽  
Electrochemical Analysis ◽  
Electrochemical Study ◽  
Limiting Current ◽  
Electrochemical Kinetics ◽  
Experimental Rate ◽  
Dropping Mercury Electrode

A study of the two polarographic prewaves of the Ni(II)–thiourea system has been made. The results were analysed by determining Koutecky's parameter from the ratio of the limiting current of the prewaves and the main wave. This parameter is considered an experimental rate constant and the influence of different variables on its value was analyzed. An electrochemical study of the prewaves was also made. Two formal mechanisms to explain both prewaves are proposed. Key words: polarographic prewaves, electrochemical kinetics, reaction mechanisms.

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.

The Influence of N,N'-Dialkylthioureas on the Two-Step Electroreduction of Zn(II) Ions

1998 ◽  
Vol 63 (6) ◽  
pp. 749-760 ◽  
Author(s):  
Grażyna Dalmata
Keyword(s):  
Electron Transfer ◽  
Double Layer ◽  
Rate Constant ◽  
Electrode Surface ◽  
Mercury Electrode ◽  
Impedance Method ◽  
Dropping Mercury Electrode ◽  
Wide Potential ◽  
Orientation Of Molecules

A two-step reduction of Zn(II) ions at the dropping mercury electrode in 1 M NaClO4/0.001 M HClO4 in the presence of N,N'-dialkylthioureas was examined in wide potential and frequency ranges, using the impedance method. The rate constant of the first electron transfer increases with increasing concentration of N,N'-dialkylthioureas, whereas that of the second electron transfer depends largely on the double layer effects, particularly, on the orientation of molecules on the electrode surface.

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

Reduction of the Ni(II) ion at the dropping mercury electrode from amoxicillin water solution

1991 ◽  
Vol 56 (1) ◽  
pp. 152-156 ◽  
Author(s):  
Milenko R. Erceg ◽  
Vera P. Kapetanović ◽  
Desanka Ž. Sužnjević
Keyword(s):  
Complex Formation ◽  
Double Layer ◽  
Rate Constant ◽  
Electrical Double Layer ◽  
Water Solution ◽  
Mercury Electrode ◽  
Reduction Mechanism ◽  
Dropping Mercury Electrode ◽  
Heterogenous Reaction

The nature of polarographic precurrents of Ni(II) ion in the presence of amoxicillin as well as the behaviour of amoxicillin in the electrical double layer has been investigated. It has been established the formation of the mono complex of Ni(II) ion with amoxicillin adsorbed at the mercury. The reduction mechanism of the complex has been proposed. Taking into account the effect of the double layer on the kinetics, the rate constant of the heterogenous reaction of the complex formation has been found to be 5.8 · 103 l mol-1 s -1.

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