FLUORIDE COMPLEXES OF GERMANIUM (IV) IN AQUEOUS SOLUTION

1963 ◽  
Vol 41 (5) ◽  
pp. 1170-1180 ◽  
Author(s):  
R. L. Benoit ◽  
J. Place
Keyword(s):  
Aqueous Solution ◽  
Solvent Extraction ◽  
Stability Constants ◽  
Perchloric Acid ◽  
Acid Media ◽  
Formation Curve ◽  
Maximum Value ◽  
Fluoride Complexes

The germanium (IV) – fluoride species in various acid media have been investigated by solvent extraction, solubility, and potentiometric methods. The results are interpreted in terms of a series of mononuclear fluorohydroxygermanium (IV) species in which the number of fluorides bound per germanium tends to a maximum value of 5. The formation curve in 0.50 M perchloric acid is explained in terms of stability constants of species [Formula: see text] and [Formula: see text]

The Extraction of Strontium and Barium with a Solution of Bis-1,2-Dicarbollylcobaltate in Nitrobenzene in the Presence of 18-Crown-6

1993 ◽  
Vol 58 (6) ◽  
pp. 1324-1336 ◽  
Author(s):  
Petr Vaňura ◽  
Emanuel Makrlík
Keyword(s):  
Aqueous Solution ◽  
Stability Constants ◽  
Organic Phase ◽  
Perchloric Acid ◽  
Extraction Constants ◽  
Individual Extraction Constants

A study has been made of the extraction of Sr and Ba in an aqueous solution of perchloric acid-18-crown-6-bis-1,2-dicarbollylcobaltate-nitrobenzene. It was found that the organic phase contains complexes of the ML2+org type ( M = Sr2+, Ba2+) that are converted to ML22+org when the concentration of crown (cL) is greater than the concentration of bis-1,2-dicarbollylcobaltate (cB). The values of the corresponding extraction constants, individual extraction constants and stability constants of the extracted species in the organic phase were determined. The system can be utilized for separation applications at concentrations here cL < cB.

scholarly journals Studies on the separation of some transition metals using trialkylimidazole as selective extractant

2017 ◽  
Vol 18 ◽  
pp. 01017
Author(s):  
Elzbieta Radzyminska-Lenarcik ◽  
Katarzyna Witt
Keyword(s):  
Aqueous Solution ◽  
Solvent Extraction ◽  
Transition Metals ◽  
Dissociation Constant ◽  
Stability Constants ◽  
Extraction Process ◽  
Ion Separation ◽  
Partition Constants

The possibility of Cu(II) ion separation from an equimolar Cu-Cd-Zn tertiary mixture by solvent extraction was investigated. The process was based on the use of 1,2,4-trimethylimidazole (TMI) and 1- decyl-2,4-dimethylimidazole (DDMI) as extractant. Dichloromethane was used as the solvent in the extraction process. The dissociation constant of extractants were found potentiometrically. Extraction data were used for finding stability constants and partition constants for the complexes being formed in the aqueous solution. For TMI, separation coefficients for Cu(II) with regard to zinc and cadmium are 2.9 and 1.3, respectively. For DDMI separation coefficients for Cu(II) with regard to zinc and cadmium are 1.4 and 1.6, respectively. Sparingly soluble in water 1-decyl-2,4-dimethylimidazole is a more useful extractant.

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