scholarly journals Determination of Diffusion Coefficients of Metals Dissolved in Mercury by Double Potential Step Chronoamperometry at Hanging Mercury Drop Electrodes

1983 ◽  
Vol 56 (7) ◽  
pp. 2133-2137 ◽  
Author(s):  
Sang Yun Park ◽  
Koichi Aoki ◽  
Koichi Tokuda ◽  
Hiroaki Matsuda
Keyword(s):  
Diffusion Coefficients ◽  
Potential Step ◽  
Double Potential Step Chronoamperometry

Double potential step chronoamperometry at microdisk electrodes: simulating the case of unequal diffusion coefficients

2004 ◽  
Vol 571 (2) ◽  
pp. 211-221 ◽  
Author(s):  
Oleksiy V. Klymenko ◽  
Russell G. Evans ◽  
Christopher Hardacre ◽  
Irina B. Svir ◽  
Richard G. Compton
Keyword(s):  
Diffusion Coefficients ◽  
Potential Step ◽  
Double Potential Step Chronoamperometry

General analytical solution for a reversible i/t response to a double potential step at spherical electrodes in the absence/presence of amalgamation effects

1994 ◽  
Vol 72 (12) ◽  
pp. 2378-2387 ◽  
Author(s):  
A. Molina ◽  
C. Serna ◽  
R. Chicón ◽  
L. Camacho ◽  
J. J. Ruiz
Keyword(s):  
Charge Transfer ◽  
Diffusion Coefficients ◽  
Transfer Reaction ◽  
Mercury Electrode ◽  
Charge Transfer Reaction ◽  
Electrolytic Solution ◽  
Potential Step ◽  
Spherical Electrode ◽  
Dropping Mercury Electrode ◽  
Double Potential Step Chronoamperometry

The general rigorous theory corresponding to double potential step chronoamperometry for a reversible charge transfer reaction in a spherical electrode whose area increases with tz, where z ≥ 0, is presented. The static mercury drop electrode (z = 0) and the dropping mercury electrode (z = 2/3) are addressed specifically. The explicit equations for the current versus time response assuming unequal diffusion coefficients for the oxidized and reduced species are valid when the product is soluble in both the electrolytic solution and the electrode. Comparisons with previous general treatments in the literature are made. The theory is applied to the detection of amalgamation in RP and DNP techniques.Moreover, in this work we show the origin of errors appearing in some general treatments in the literature, these errors lead to physically meaningless results when amalgamation takes place.

The Calculation of Turbulent Diffusion Coefficients in Aquatic Ecosystems

2019 ◽  
Vol 70 (11) ◽  
pp. 3903-3907
Author(s):  
Galina Marusic ◽  
Valeriu Panaitescu
Keyword(s):  
Transport Equation ◽  
Turbulent Diffusion ◽  
Diffusion Coefficients ◽  
Aquatic Ecosystems ◽  
Specific Area ◽  
Left Bank ◽  
The Right ◽  
Prut River

The paper deals with the issues related to the pollution of aquatic ecosystems. The influence of turbulence on the transport and dispersion of pollutants in the mentioned systems, as well as the calculation of the turbulent diffusion coefficients are studied. A case study on the determination of turbulent diffusion coefficients for some sectors of the Prut River is presented. A new method is proposed for the determination of the turbulent diffusion coefficients in the pollutant transport equation for specific sectors of a river, according to the associated number of P�clet, calculated for each specific area: the left bank, the right bank and the middle of the river.

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