Radiochemistry
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Extraction Properties of Bis(diphenylphosphinylethyl)phosphinic Acid in Nitric Acid Solutions
Radiochemistry - Tập 47 - Trang 278-283 - 2005
Extraction of microamounts of U(VI), Th(IV), Sc(III), and Ln(III) from HNO3 solutions with solutions of bis(diphenylphosphinylethyl)phosphinic acid in dichloroethane was studied. The stoichiometry of the extractable complexes was determined, and the effect of the inorganic anion and organic diluent on the extraction of rare-earth elements was examined. An increase in the number of phosphoryl group......
The Role of Hydroxide Ions in Reduction of Plutonyl Ion Stimulated by Nitrogen Laser Radiation (337.1 nm)
Radiochemistry - Tập 43 - Trang 360-363 - 2001
The behavior of the Pu2
2
+ ion excited by radiation of a pulse nitrogen laser in aqueous solutions with a high content of CsF was studied at various pH. Chemiluminescence of luminol under the action of OH radicals arising in the solution was considered. The absorption spectra of PuO2
2+ complexes in aqueous solution with a high content of CsF are presented.
Extraction of U(VI) with poly(ethylene glycol) in two-phase aqueous systems containing various anions
Radiochemistry - Tập 46 - Trang 457-460 - 2004
The distribution of U(VI) between the phase of poly(ethylene glycol) (PEG) of various molecular weights (1500, 4000, 6000, and polydisperse PEG115) and aqueous phosphate, sulfate, and carbonate solutions was studied at pH 3– 13. With increasing PEG molecular weight, the distribution factor of U(VI) increases. The extraction isotherms of U(VI) at 20°C were obtained. The scattering of laser radiatio......
Synthesis and crystal structure of double Np(V) cesium oxalate CsNpO2C2O4 · nH2O
Radiochemistry - Tập 48 - Trang 223-226 - 2006
An X-ray diffraction study of CsNpO2C2O4 · nH2O was carried out. The structure consists of NpO
2
+
and Cs+ cations, oxalate anions, and water molecules. Dioxo cations are combined by cation-cation interaction into cyclic trimer in which each NpO
2
+
cation act as monodentate ligand. The coordi......
Synthesis, crystal and molecular structure, and spectral properties of guanidinium salt of complex uranyl 2-methoxybenzoate
Radiochemistry - Tập 54 - Trang 335-340 - 2012
A crystalline uranyl 2-methoxybenzoate, [C(NH2)3][UO2L3]·H2O, was synthesized. Its structure was determined by single crystal X-ray diffraction, and the electronic and IR spectra were recorded. The coordination number of the U atom is 8, with methoxyl O atom not involved in coordination bonding with uranyl. The structure contains a system of hydrogen bonds with water molecule of crystallization an......
Leaching of borosilicate glasses containing simulated high-level waste from the experimental and demonstration center of the mining and chemical combine in mineralized water of a granitoid formation
Radiochemistry - - 2015
Liquid–liquid extraction of certain trivalent lanthanides from nitrate solutions with N,N,N',N'-tetrabutylsuccinamide as new extractant
Radiochemistry - Tập 57 - Trang 602-609 - 2015
The extraction of Nd(III), Eu(III), Sm(III), Gd(III), and Dy(III) from nitrate solutions with N,N,N',N'-tetrabutylsuccinamide (TBSA) in toluene was studied. The distribution ratios of the investigated metal ions were determined in relation to the nitric acid concentration, kind of diluent, concentrations of the extractant and salting-out agents, and temperature. The stoichiometry of the TBSA–HNO3 ......
Behavior of polymeric Pu(IV) in simulated groundwater
Radiochemistry - Tập 51 - Trang 18-25 - 2009
The effect of pH, ionic strength, and supporting electrolyte on the speciation of Pu(IV) in simulated groundwater over polymeric plutonium hydroxide at fixed values of the oxidation potential Eh was examined by centrifugal ultrafiltration. Upon dilution of simulated groundwater (SGW) containing highly polymerized polymeric Pu species of high molecular weight, these species transform into those wit......
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