scholarly journals Kinetics of chalcopyrite leaching in either ferric sulphate or cupric sulphate media in the presence of NaCl

2016 ◽  
Vol 148 ◽  
pp. 147-154 ◽  
Author(s):  
Tacia C. Veloso ◽  
Johne J.M. Peixoto ◽  
Márcio S. Pereira ◽  
Versiane A. Leao
Keyword(s):  
Ferric Sulphate ◽  
Cupric Sulphate ◽  
Sulphate Media ◽  
Kinetics Of

The kinetics of the U(VI)-U(IV) exchange in perchlorate and sulphate media

1974 ◽  
Vol 36 (10) ◽  
pp. 2355-2359 ◽  
Author(s):  
A. Ekstrom ◽  
G.E. Batley ◽  
T.M. Florence ◽  
Y.J. Farrar
Keyword(s):  
Sulphate Media ◽  
Kinetics Of

Kinetics of the manganese(III)-oxalate reaction in acidic sulphate media

1993 ◽  
Vol 18 (2) ◽  
pp. 218-220 ◽  
Author(s):  
L'ubica Adamčíková ◽  
Adriana Krížová ◽  
Ivan Valent
Keyword(s):  
Sulphate Media ◽  
Kinetics Of ◽  
Acidic Sulphate

Investigations into the kinetics and stoichiometry of bacterial oxidation of covellite (CuS) using a polarographic oxygen probe

1978 ◽  
Vol 24 (8) ◽  
pp. 998-1003 ◽  
Author(s):  
Pamela A. D. Rickard ◽  
Donald G. Vanselow
Keyword(s):  
Oxygen Uptake Rate ◽  
Zero Order ◽  
Bacterial Oxidation ◽  
Kinetics Of Oxidation ◽  
First Order ◽  
Cupric Ion ◽  
First Order Kinetics ◽  
Zero Order Kinetics ◽  
Cupric Sulphate ◽  
Kinetics Of

"Oxygraph" apparatus was used to measure quantitatively the kinetics of oxidation of synthetic covellite (CuS) in the presence and absence of Thiobacillus species. The expected stoichiometric relationship between oxygen consumed and cupric sulphate produced was verified by atomic absorption assays of cupric ion and sulphate ion. Thiobacillus cultures markedly increased the oxidation rate.The dependence of each oxygen-uptake rate on oxygen concentration was also measured. Sterile controls and some bacterial cultures showed first-order kinetics while other cultures showed zero-order kinetics.Addition of biological inhibitors to reacting slurries revealed that cultures showing first-order kinetics did not oxidize CuS itself but merely oxidized elemental sulphur formed by non-enzymic oxidation of CuS. Cultures showing zero-order kinetics oxidized CuS in a way that resulted in all oxygen reduction being enzymic. This mechanism possibly involves the cyclic oxidation and reduction of soluble iron.

Kinetics of electrode reaction of Eu3+/Eu2+ studied by cyclic voltammetry and tast polarography

1990 ◽  
Vol 55 (7) ◽  
pp. 1666-1672 ◽  
Author(s):  
Jaroslav Němec ◽  
Tomáš Loučka
Keyword(s):  
Cyclic Voltammetry ◽  
Kinetic Parameters ◽  
Electrochemical Behaviour ◽  
Mercury Electrode ◽  
Electrode Reaction ◽  
Dropping Mercury Electrode ◽  
Sulphate Media ◽  
First Time ◽  
Kinetics Of ◽  
The Eu

The electrochemical behaviour of europium at the dropping mercury electrode was studied in the medium of 1M-NaClO4, 1M-NaCl, 1M-NaNO3, and 1M-Na2SO4. The curves obtained by Tast polarography and the kinetic parameters (ks, α) for the Eu3+/Eu2+ system in the medium of perchlorate and chloride solutions are in accord with the results published earlier. The kinetic parameters in nitrate and sulphate media are given for the first time. In the medium of nitrates, the electrode reaction is probably accompanied by a chemical reaction.

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