Solvent extraction studies on Th(IV) and U(VI) using PolyEthylene Glycol (PEG) based aqueous biphasic system (ABS) with 18-crown-6
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K. V. Lohithakshan
Summary
Extraction of Th(IV) and U(VI) using PEG-2000/(NH4)2SO4 (40% w/w of each) aqueous biphasic system (ABS) with 18-crown-6 (18-C-6) as the extractant was studied at four fixed temperatures in the range 288 to 318 K. The species extracted were identified to be [Th·(18-C-6)](SO4)2 and [UO2·(18-C-6)]SO4 by the slope ratio method. The equilibrium constant (K) was evaluated for the extraction reactions. The thermodynamic parameters evaluated by the temperature coefficient method at 298 K showed that the reaction is favoured by decrease in enthalpy and counteracted by decrease in entropy. The large decrease in the enthalpy values was attributed to direct bonding of crown ether to the central metal atom (i.e. the formation of inner sphere complex).
© by Oldenbourg Wissenschaftsverlag, München
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Artikel in diesem Heft
- Attempts to chemically investigate element 112
- Distribution studies on Th(IV), U(VI) and Pu(IV) using tri-n-butylphosphate and N,N-dialkyl amides
- Solvent extraction studies on Th(IV) and U(VI) using PolyEthylene Glycol (PEG) based aqueous biphasic system (ABS) with 18-crown-6
- The aqueous complexation of thorium with citrate under neutral to basic conditions
- Production of [124I]-iodine on an 11 MeV cyclotron
- Electroplating/electrodissolution/recovery cycle for rhodium target used for an industrial scale cyclotron production of palladium-l03
- Effects of phosphate and ionic strength upon uranium(VI) sorption onto alumina as a function of pH
- Adsorption of lanthanum to goethite in the presence of gluconate
