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  • 1
    Electronic Resource
    Electronic Resource
    Synergic extraction of thorium by beta-isopropyltropolone-neutral donor combinations (1984)
    Springer
    Journal of radioanalytical and nuclear chemistry 81 (1984), S. 89-108 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The extraction of thorium by benzene solutions of HIPT in presence of different neutral extractants (S) was studied using perchloric, hydrochloric and sulphuric acids as aqueous media. With TBP as the donor the effect of the diluents CCl4, benzene and CHCl3 on the extraction was studied. The synergism observed was attributed to the formation of the extractable adduct Th(IPT)4 · S and, in some cases, to the extraction of additional mixed adducts involving the participation of the anion of the aqueous medium used for extraction. The adduct formation constants for the formation of Th(IPT)4 ·S were evaluated and the formation of this adduct was independently confirmed by spectrophotometric measurements. The aqueous complexing of thorium by IPT was investigated spectrophotometrically as these data were required for the quantitative interpretation of the extraction data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02132924
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Some studies on synergic extraction of mixed ligand species of uranium(VI) (1988)
    Springer
    Journal of radioanalytical and nuclear chemistry 121 (1988), S. 149-159 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The extraction of U(VI) by mixtures of HTTA and TBP from aqueous thiocyanate medium has been studied. From the data obtained it was observed that the predominant uranium species extracted, causing synergic enhancement in the extraction of U(VI), is UO2(SCN)TTA · 2TBP when benzene and cyclohexane are used as diluents, and that at a very low concentration of TBP the contribution of additional species, viz. UO2(TTA)2 · TBP becomes significant. With chloroform as diluent, however, both of these species are contributing to the synergic enhancement. The extraction of a quaternary uranium species, UO2(SCN)TTA · 2TBP, involving the participation of the aqueous anion is thus established. Equilibrium constants for the various extraction equilibria involved are calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02041456
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of mixed solvent media on the sorption and separation of uranium and plutonium on macroporous resins (1997)
    Springer
    Journal of radioanalytical and nuclear chemistry 223 (1997), S. 193-198 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Ion-exchange studies on uranium and plutonium using macroporous (MP) anion-exchange resins from an aqueous-organic solvent mixed media were carried out to develop a separation method. Out of the several water miscible organic solvents tried methanol and acetone were found to be best suited. Distribution data were obtained for U(VI) and Pu(IV) using three macroporous resins under various parameters. Based on these data, separation factors for Pu/U were calculated. Column experiments using Tulsion A-27(MP) were also carried out. The method has the advantage of loading plutonium from as low as 1M nitric acid in the presence of methanol or acetone and could be used satisfactorily for its recovery from solutions containing plutonium and uranium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02223383
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  • 4
    Electronic Resource
    Electronic Resource
    Extraction of U(VI) by phosphonic acid in the presence of neutral donors (1995)
    Springer
    Journal of radioanalytical and nuclear chemistry 200 (1995), S. 1-8 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Extraction of U(VI) by mixtures of 2-ethylhexyl 2-ethylhexylphosphonic acid (PC88A) and TOPO in cyclohexane and xylene from aqueous sulfuric acid medium has been investigated. Synergism was observed and the species responsible was identified as UO2H2Y4.TOPO. From the data equilibrium constants for the various reaction equilibria at different temperatures and the thermodynamic parameters were calculated. Antagonism was observed when alkylamide or TBP was used as the neutral donor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02164815
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  • 5
    Electronic Resource
    Electronic Resource
    Extraction of uranium and plutonium from oxalate bearing solutions using phosphonic acid: Solvent extraction, extraction chromatography and infrared studies (1999)
    Springer
    Journal of radioanalytical and nuclear chemistry 240 (1999), S. 631-635 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Solvent extraction and extraction chromatography studies of uranium and plutonium from oxalate supernatant solutions were carried out using 2-ethyl hexyl-2-ethyl hexyl phosphonic acid (PC88A). Based on the distribution data, it was inferred that both the uranium and plutonium could be recovered satisfactorily from such a solution. These studies were found to be useful in optimising the appropriate concentration of PC88A, HNO3, oxalic acid and temperature to recover more than 90% of plutonium from the large volumes of oxalate bearing waste solutions. Spectral characteristics of the extractant and its complexing behavior with U(VI) was also studied using IR & FTIR.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02349424
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    Paper (German National Licenses)
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