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Extraction of Th(IV) and U(VI) using PEG-2000/(NH 4 ) 2 SO 4  (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)](SO 4 ) 2  and [UO 2 ·(18-C-6)]SO 4  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).

Solvent extraction studies on Th(IV) and U(VI) using PolyEthylene Glycol (PEG) based aqueous biphasic system (ABS) with 18-crown-6