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  • Author or Editor: W. Sanad x
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Abstract  

Very economical, rapid and pure methods for the production of115mIn and113mIn from115Cd and113Sn, respectively are described. The methods are based on the extraction of115mIn by o-xylene from 7.2M H2SO4 −0.06M HBr, and its reextraction with ≈11M H2SO4 −0.06M HBr from n-hexane. The γ-spectra of the generated115mIn and113mIn indicate that they are free from any other interferences.

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Abstract  

The extraction of Fe, Zn and In by La2HCl from H2SO4 solutions has been studied. The formation of the aqueous complexes H2Fe(SO4)2HSO4, HZn(SO4)HSO4 and HInSO4(HSO4)2 is discussed. The formation of mixed ligand species H2Fe(SO4)2Cl, HZnSO4Cl and HInSO4Cl2 from the interaction of Cl+ in aqueous solution or in LA2HCl before extraction is explained. The reactions in the system to produce the extractable species are discussed. The possible separations are given.

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Abstract  

A systematic study on the extraction of tantalum fluoride from various acidic solutions and mixed media has been given using HDEHP, TBP and LA-2 as solvents. The results obtained for these three solvents clarify the ionic behaviour of tantalum. The separation of tantalum from other elements is discussed.

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Abstract  

The equilibrium and rate of solvent extraction of FeCl3 complexes from HCl solutions into benzene solutions of tributyl phosphate (TBP) has been studied. The extracted species was found to be FeCl3·3TBP. The results show that the extraction is first order in both Fe(III) and TBP. The rate constant of adduct formation equals ∼1.24M min−1. The reaction order is zero for the aqueous phase acidity. The rate-controlling steps are discussed in the light of the results.

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Abstract  

A systematic study on the extraction of99Mo and its daughter99mTc by pure organic diluents and dinonylnaphthalinesulfonic acid (DNNS) is described. The aqueous phases used are H2SO4, HCl, KI and their binary mixture solutions. The effect of alcohols on the distribution coefficient has been investigated. As a result of the study, a simple and rapid generator is built for the production of pure99mTc from99Mo.

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Abstract  

A systematic study is presented on the extraction of60Co and65Zn bromides and chlorides from H2SO4 with tri-n-butyl phosphate (TBP) and Amberlite LA-2. It has been found that the presence of a little HBr or HCl enhances the extraction of the two isotopes with both solvents. The extractions of60Co and65Zn have been studied as functions of the acidity (HBr, HCl or H2SO4) in the aqueous phase, and of the diluent and solvent concentrations in the organic phase. The presence of water-miscible alcohols or acetone enhances extraction. A suggested extraction mechanism is presented in the light of the obtained results.

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Abstract  

The equilibrium and rate of solvent extraction of zinc chloride complexes from HCl solutions into benzene solutions of tributyl phosphate (TBP) have been studied. The extracted species are discussed in the light of the results. The extraction was found to be first order with respect to both Zn(II) and TBP, and zero order for HCl. The rate-controlling steps are discussed and the rate constants for these reactions are calculated.

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Abstract  

The equilibrium and rate of solvent extraction of FeBr2 complexes from HBr solutions into benzene solutions of tributyl phosphate (TBP) have been investigated. It is found that two reactions control the iron(III)-TBP extraction from hydrobromic acid solutions. From HBr activity of 1.2–1.55 (molarity based) the reaction is inverse third order with respect to the aqueous phase acidity. From HBr activity of 1.7–6 (molarity based) the reaction is first order in HBr concentration in the aqueous phase. Both of these reactions are first order for both Fe(III) and TBP. The rate constants for these reactions were calculated and the rate-controlling steps are discussed.

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Abstract  

The rates of extraction of Zn(II) from hydrobromic acid solutions into benzene solutions of the liquid anion exchanger Amberlite LA-2 and those into methyl isobutyl ketone (MIBK) have been investigated. The distribution equilibria of this system have been also studied. Under the used experimental conditions the extracted species of Zn(II) have been proposed. The kinetic data indicated a first order reaction with respect to Zn(II) in both systems, nearly one with respect to HBr and from 0–0.38 for LA-2. In case of extraction of Zn(II) with methyl isobutyl ketone, MIBK, the reaction order with respect to MIBK was found to be 4 and with respect to HBr inverse first order. The rate constants of these extraction processes were determined and the rate determining steps were discussed in the light of the obtained results.

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Abstract  

The extraction of Fe(III) and Fe(II) from various aqueous acidic solutions, with nitrobenzene, Amberlite LA-2, TBP and HDEHP is described. Conditions are given for the separation of Fe(III) from Fe(II). The extraction and separation of Fe(III) and Fe(II) is most adequate from HCl solutions, using the four solvents. The extraction of iron halides from H2SO4 solutions has been studied. The effect of water-miscible alcohols on the distribution of Fe(III) and Fe(II) was also studied. Extraction equilibria and mechanisms were proposed on the basis of the obtained results.

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