Stability constants of rare earths complexes. I. Thermodynamic stability constants of complexes of europium and terbium with α-hydroxyisobutyric acid

1971 ◽  
Vol 36 (9) ◽  
pp. 3370-3373 ◽  
Author(s):  
J. Alexa
Keyword(s):  
Stability Constants ◽  
Rare Earths ◽  
Thermodynamic Stability ◽  
Stability Constants Of Complexes ◽  
Hydroxyisobutyric Acid

Extraction of strontium and barium salts by the nitrobenzene solution of dicarbolide in the presence of glymes

1985 ◽  
Vol 50 (3) ◽  
pp. 581-599 ◽  
Author(s):  
Petr Vaňura ◽  
Emanuel Makrlík
Keyword(s):  
Stability Constants ◽  
Organic Phase ◽  
Equilibrium Constants ◽  
Minor Role ◽  
Nitrobenzene Solution ◽  
Ligand Structure ◽  
Stability Constants Of Complexes ◽  
Separation Factors ◽  
The Stability ◽  
A Minor

Extraction of microamounts of Sr2+ and Ba2+ (henceforth M2+) from the aqueous solutions of perchloric acid (0.0125-1.02 mol/l) by means of the nitrobenzene solutions of dicarbolide (0.004-0.05 mol/l of H+{Co(C2B9H11)2}-) was studied in the presence of monoglyme (only Ba2+), diglyme, triglyme, and tetraglyme (CH3O-(CH2-CH2O)nCH3, where n = 1, 2, 3, 4). The distribution of glyme betweeen the aqueous and organic phases, the extraction of the protonized glyme molecule HL+ together with the extraction of M2+ ion and of the glyme complex with the M2+ ion, i.e., ML2+ (where L is the molecule of glyme), were found to be the dominating reactions in the systems under study. In the systems with tri- and tetraglymes the extraction of H+ and M2+ ions solvated with two glyme molecules, i.e., the formation of HL2+ and ML22+ species, can probably play a minor role. The values of the respective equilibrium constants, of the stability constants of complexes formed in the organic phase, and the theoretical separation factors αBa/Sr were determined. The effect of the ligand structure on the values of extraction and stability constants in the organic phase is discussed.

scholarly journals Thermodymanic Considerations on Gold Dissolution in Different Lixiviants (I)

2019 ◽  
Vol 70 (8) ◽  
pp. 2727-2732
Author(s):  
Catalin Alexandru Barbu ◽  
Ion Constantin ◽  
Mihnea Cosmin Costoiu ◽  
Mihai Buzatu ◽  
Augustin Semenescu
Keyword(s):  
Stability Constants ◽  
Thermodynamic Stability ◽  
Gold Dissolution ◽  
Gold Complexes ◽  
Electrode Potentials ◽  
Electrochemical Mechanism ◽  
The Stability ◽  
Cyanide Solutions ◽  
Gold Industry

The paper presents the main thermodynamic aspects related to gold dissolution in different lixiviants. We analyzedthe thermodynamic stability of the gold complexes with the most representative lixiviants with potential for use in the gold industry. Based on the stability constants we determined the electrode potentials of the gold dissolution reactions in variouslixiviants and we presented the electrochemical mechanism of gold dissolution is alkaline cyanide solutions.

scholarly journals Improving the Thermodynamic Stability of Aluminate Spinel Nanoparticles with Rare Earths

2016 ◽  
Vol 28 (14) ◽  
pp. 5163-5171 ◽  
Author(s):  
Md M. Hasan ◽  
Sanchita Dey ◽  
Nazia Nafsin ◽  
John Mardinly ◽  
Pratik P. Dholabhai ◽  
...  
Keyword(s):  
Rare Earths ◽  
Thermodynamic Stability ◽  
Spinel Nanoparticles

Catalytic-thermometric determination of stability constants of complexes using the iodine-azide reaction

1986 ◽  
Vol 103 (2) ◽  
pp. 325-332 ◽  
Author(s):  
M.C.García Alvarez-Coque ◽  
R.M.Villanueva Camaãs ◽  
G.Ramis Ramos ◽  
M.J.Medina Hernández ◽  
C.Mongay Fernández
Keyword(s):  
Stability Constants ◽  
Stability Constants Of Complexes ◽  
Thermometric Determination
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