Solvent Extraction & Ion-exchange Studies on Cadmium & Thallium Complexes with Glycollic & Lactic Acids

570-57

Synergism in the Extraction of Indium by a Mixture of Di-2-ethylhexylphosphoric Acid & a β-Diketone

734-73

Study of indium complexes by solvent extraction and ion exchange

Complexes of indium with hydroxy carboxylic acids like glycollic, mandelic and thioglycollic acids have been investigated by the method of competitive reactions using HTTA as the auxiliary ligand. An ion exchange study has been made in some cases to confirm the results. An ion exchange study of indium fluoride complexes has also been made. The data have been analysed for the stability constants of the indium complexes

Mixed chelates by solvent extraction-mixed chelates of indium with β-diketones in carbon tetrachloride and xylene media

Mixed complex formation of indium with a number of β-diketones has been studied from carbon tetrachloride and xylene media. The extraction of indium by BFA and FFA was studied and the nature of the complexes established. The formation of the mixed complexes with BFA and BA/DBM, FFA and BA as well as BFA and FFA have been studied and their equilibrium constants calculated. The statistical and stabilisation constants have been calculated an interpreted on the basis of the participating ligands

Solvent extraction studies of indium-mixed chelates with β-diketones in benzene media

Mixed chelate formation of indium with several β-diketones has been studied from benzene media. The extraction of indium by BFA and FFA has been carried out as a function of pH and concentration of the ligand to ascertain the nature of the complexes. The extraction of indium by a mixture of β-diketones, viz., BFA-BA, BFA-DBM, FFA-BA, FFA-DBM, FFA-BFA and DBM-BA has also been studied as a function of the solution parameters. The nature of the mixed complexes formed as well as their equilibrium constants, statistical and stabilisation constants have been evaluated

Solvent extraction studies of indium. IV. Primene JM-T extraction in presence of malonic acid

Solvent extraction of indium from malonic acid medium by Primene JM-T has been studied. The extraction has been studied as a function of pH and concentrations of malonic acid and sodium malonate. The nature of the acid-amine complex has been established by chemical analysis and by the application of the method of Hogfeldt and Fredlund. The equilibrium constant for the reaction has also been calculated. The nature of the indium complexes getting extracted has also been discussed

Solvent extraction studies of indium. II. Lactate complexes

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Extraction of indium, cadmium and thallium by dinonylnaphthalene sulfonic acid

The extraction of indium, cadmium and thallium by dinonylnaphthalene sulfonic acid (HD) from acid media has been studied. HD extracts the metal ion by an ion exchange mechanism. The nature of the species and the extent of aggregation has been evaluated. The effect of diluents on the extraction has also been studied and the results interpreted on the basis of aggregation of HD. A comparative study with solid ion exchangers has also been made

Synergism in the extraction of cadmium

Synergism in the extraction of cadmium by mixtures of BFA and TOPO or TBP has been investigated. Extraction of cadmium was found negligible in the presence of BFA, TOPO or TBP alone while the addition of alkylphosphorus ester to the β-diketone resulted in considerable enhancement of the extraction. The nature of the adduct was found to be of the type [Gd (BFA)2 (TOPO)2] and the equilibrium constant for the reaction was also evaluated. Similar results were observed in the case of TBP, while DPSO did not enhance the extraction, indicating the donor strengths of the synergists to be in the order TOPO > TBP > DPSO. The coordination of alkylphosphate to the metal ion was confirmed by infrared spectra of the complexes in benzene

Synergism in the extraction of uranium in presence of antipyrine

Synergism in the extraction of uranium (VI) has been studied in the presence of a mixture of antipyrine and β-diketones like benzoyltrifluoroacetone, trifluoroacetylacetone and furoyltrifluoroacetone. The nature of the extracted species has been ascertained from the variation of log D with pH and the concentrations of the extractants. The equilibrium constants for the synergistic species have been evaluated taking into account the protonation and partition coefficient of antipyrine