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Abstract  

The extraction of Na3+, Eu3+ and Tm3+ by di-(2-ethylhexyl)phosphoric acid, HDEHP has been studied from various aqueous acidic solutions. The extraction of these elements is inversely proportional to the third power of the hydrogen ion concentration. Antagonistic effects were observed when the extraction was studied by mixtures of HDEHP and tributyl phosphate, TBP, or trioctylphosphine oxide, TOPO. The presence of water-miscible alcohols and acetone generally increases the extraction of these three elements from HCl solutions. Reaction mechanisms have been suggested and discussed in the light of the data obtained.

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Abstract  

An extraction study was performed on technetium in its highest oxidation state as a function of nitric acid concentration at 25, 50 and 70 °C. A long chain amine (tri-n-octylamine TOA) and an organophosphorus solvent (TBP) have been investigated. Addition of NH4NO3 has a salting-out effect on the extraction of TBP in the aqueous phase and therefore decreases the distribution coefficient for heptavalent technetium. The mechanism of extraction is discussed in the light of the results obtained.

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Abstract  

A rapid method for the production of115mIn from irradiated cadmium is described. The procedure of the method is based on the extraction of115mIn by bis(2-ethyl hexyl) phosphoric acid (HDEHP) from 0.1N sulphuric acid. Accumulated115mIn can then be reextracted into diluted hydrochloric, hydrobromic, nitric or sulphuric acid solutions with a concentration of 1N or higher. A summary on the behaviour of cadmium and indium extraction with the solvent was given as a preliminary step in the present study. The produced115mIn was found to be free from any cadmium as well as from any other foreign activity.

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Solvent extraction studies on cadmium

III. Extraction and separation of macroamounts of Cd, Zn and Co halides from sulphuric acid media

Journal of Radioanalytical and Nuclear Chemistry
Authors:
A. Alian
and
A. El-Kot

Abstract  

An extraction study was performed on various concentrations of cadmium, zinc and cobalt halides in the presence of sulphuric acid. A long chain amine (Amberlite LA-2) and an organophosphorus solvent (TBP) have been investigated. In most cases the value of the distribution ratio decreases with the increase of metal concentration in the aqueous phase. The various possibilities of chemical and radiochemical separations of cadmium from accompanying metal species are reported.

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Abstract  

A systematic study has been carried out on the extraction of SeI4, by various water-immiscible organic solvents. Extraction has been investigated as a function of H2SO4 and Kl concentrations. It has been found that Se(IV) extraction is appreciably increased by addition of iodide ion to sulfuric acid solutions. On the other hand, the presence of water-miscible alcohols and acetone was found to enhance Se(IV) extraction from H2SO4–Kl solutions. In the light of the results, an extraction mechanism is suggested.

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Separation of metal halide pairs using Amberlite LA-2 and tri-n-butyl phosphate

III. Separation of silver from cadmium and from zinc

Journal of Radioanalytical and Nuclear Chemistry
Authors:
A. El-Kot
,
A. Ghoneim
, and
A. Alian

Abstract  

Separation factors of silver-cadmium and silver-zinc pairs were determined for Amberlite LA-2 and tri-n-butyl phosphate (TBP) from pure hydrochloric, hydrobromic, sulphuric and orthophosphoric acids as well as from their binary mixtures. The separation of cadmium and zinc from macroamounts of silver can be best achieved from ca. 2M H2SO4. There are many other media suitable for the separation of trace silver from cadmium and zinc matrices.

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Journal of Radioanalytical and Nuclear Chemistry
Authors:
A. Alian
,
A. El-Kot
,
M. El-Bassiouny
, and
A. Haggag

Abstract  

The extraction of SbI3 by various organic solvents has been investigated as a function of H2SO4, KI and organic additive concentrations. At [Sb3+]: [I]≈3, extraction increases in the order hexane → cyclohexane → kerosene → CCl4→CHCl3 → benzene → toluene → o-xylene → nitrobenzene.

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Solvent extraction studies on cadmium

I. Extraction and separation of microamounts of cadmium halides in absence and presence of sulphuric acid

Journal of Radioanalytical and Nuclear Chemistry
Authors:
A. Alian
,
A. El-Kot
,
A. Badran
, and
M. El-Bassiouny

Abstract  

An extraction study was performed on tracer concentrations of cadmium halides in absence and presence of sulphuric acid. Inert solvents, nitrobenzene, a long chain amine (Amberlite LA-2) and organophosphorus solvents (TBP and HDEHP) have been investigated. The comparative stability of cadmium chloride and bromide TBP solvates were determined. The presence of sulphuric acid was found to enhance considerably the extraction of cadmium halides by nitrobenzene, Amberlite LA-2 and TBP. The mechanism of extraction has been discussed in light of the obtained results.

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Solvent extraction studies on cadmium

II. Extraction and separation of microamounts of cadmium halides in absence and presence of phospheric acid

Journal of Radioanalytical and Nuclear Chemistry
Authors:
A. Alian
,
A. Badran
,
M. El-Bassiouny
, and
A. El-Kot

Abstract  

An extraction study was performed on tracer concentrations of cadmium, zinc and silver halides in absence and presence of phosphoric acid. A long chain amine (Amberlite LA-2) and an organophosphorus solvent (TBP) have been investigated. The presence of phosphoric acid was found to enhance considerably the extraction of most halides. The mechanism of extraction has been discussed in light of the obtained results.

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Effect of the nature of organic solvents on their interaction with metal halides

V. Extraction of thallium halides from H2SO4 and H3PO4 solutions

Journal of Radioanalytical and Nuclear Chemistry
Authors:
A. Alian
,
A. El-Kot
,
A. Haggag
,
W. Sanad
, and
N. Tadros

Abstract  

A systematic study has been carried out on the extraction of thallium halides with aromatic hydrocarbons, TBP and Amberlite LA2. Extraction has been studied from both H2SO4 and H3PO4 of various molarities. Among the solvents studied nitrobenzene, TBP and Amberlite LA2 were found to give the best extraction of Tl(III) and its separation from Tl(I) and other ions. Extraction mechanism was discussed in light of the obtained results.

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