The extraction of actinium by HDEHP solutions in n-heptane as a function of mineral acids and some lanthanides (Ln) in the aqueous phase has been studied. It was found that the actinium extraction coefficient in the absence of Ln decreased linearly with acid concentration with the slope of –3 in the whole investigated range of its concentration. In the presence of Ln the extraction coefficient decreased with a smaller slope than in the absence of Ln. This slope decreased with the Ln salt concentration. The extraction coefficient of Ac decreased with a slope of –3 at acid concentrations above 0.1N, regardless of the Ln concentration in the extraction system.
The extraction of actinium with HDEHP from Cl– and NO
systems has been investigated. It was found that extraction of actinium from HCl solutions is much better than from HNO3 solutions. Stability constants of the actinium complexes Ac(X–)2+, X–=Cl– or NO
, were determined. Our results show that actinium formed less stable complexes with Cl– than with NO
Authors:B. Kubica, M. Tuteja-Krysa, and Z. Szeglowski
Sorption coefficients of Hf, Zr and Nb on nickel-potassium hexacyanoferrate(II) (NF), nickel hexacyanoferrate(II) composite
ion exchanger (NCF) and on the ion exchange resins (Dowex-1 and Dowex-50) from inorganic acids solutions were determined.
The results obtained indicate that hafnium, zirconium and niobium in dilute sulphuric and hydrochloric acids form anionic
and cationic complexes which sorbed on the ion exchangers studied.
Authors:B. Kubica, M. Tuteja-Krysa, H. Godunowa, and Z. Szeglowski
Sorption coefficients of Hf and Nb on cupric hexacyanoferrate and zinc hexacyanoferrate from inorganic acid solutions were determined. The results indicate that hafnium and niobium in sulphuric and hydrochloric acids form anionic and cationic complexes which are absorbed on the examined ion exchangers.
Authors:Z. Szeglowski, Dinh-Thi Lien, L. Guseva, S. Timokhin, B. Kubica, and G. Tikhomirova
Ion-exchange behavior of Re and Os as homolgs of Bh and Hs, respectively, has been studied in the sulfuric acid media. The distribution coefficients of 183Re and 185Os as well as of other radionuclides between Dowex-50 and H2SO4 solutions were determined as a function of the acid concentration. It was shown, that cation-exchange column may be used for the separation of Os, Re and W from elements of III group, whereas anion-exchange column for their concentration from diluted sulfuric acid solutions. The 0.05M H2SO4 was used for continuous on-line separation of short-lived Os isotopes produced in the nuclear reactions: nat.Dy(20Ne, xn)Os. Radionuclides of Os, Re and W were strongly sorbed on anion-exchange column only.