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Kumar S.,Indira Gandhi Center for Atomic Research | Kumar S.,Reprocessing Group | Kumar R.,Indira Gandhi Center for Atomic Research | Kumar R.,Indian Atomic Energy Regulatory Board | Koganti S.B.,Indira Gandhi Center for Atomic Research
Journal of Molecular Liquids | Year: 2012

Aceto-hydroxamic acid (AHA) is a novel reductant and complexant for actinides. Information on the thermodynamic parameters for AHA-water system is scarce. For simulation of solvent extraction flowsheets utilizing AHA, these parameters are required for accurate prediction of complexation and other goals. In this paper, activity coefficients, osmotic coefficients and excess Gibbs energies of AHA-water solutions at 298.15 K and 0.1 MPa are reported. © 2012 Elsevier B.V. All rights reserved.

Priyadarshini N.,Reprocessing Group | Sampath M.,Reprocessing Group | Kumar S.,Reprocessing Group | Kamachi Mudali U.,Reprocessing Group
Journal of Radioanalytical and Nuclear Chemistry | Year: 2015

The hydrolytic polymerization of Th(IV) has been investigated by light scattering technique in 10–20 mM and 0.05–0.4 M Th(IV) solutions. The present investigation shows that well defined colloids are formed at two different Th concentration and pH domains. The initially formed colloids at lower concentration are larger than those formed at higher concentration, which may be due to more crystalline nature of colloids formed at higher concentration. The colloidal polymers formed are of high molecular weight. The results of this work are a clear indication that Th(IV) hydrolysis do not differ from hydrolysis of Pu(IV). © 2015 Akadémiai Kiadó, Budapest, Hungary

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