Journal
JOURNAL OF SAUDI CHEMICAL SOCIETY
Volume 14, Issue 3, Pages 311-315Publisher
KING SAUD UNIV ACADEMIC PUBL & PRESS
DOI: 10.1016/j.jscs.2010.04.007
Keywords
Ionic strength; Extraction; Metal chelate complexes; Synergistic effect; Deionized water; Spontaneous process
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Extraction of Th(IV) ion from nitrate media at high ionic strength (I = 1.00, 3.00. 5.00 and 7.00 M) using didodecylphosphoric acid was studied. The effect of HDDPA concentration, ionic strength, pcH and temperature on the extraction processes have been studied in nitrate media. From the equation of the extraction process, (K(ex)) extraction constant can be calculated from the distribution ratio D(c) values at different temperatures. Enthalpy, free energy and entropy changes were determined. The composition of the complex formed were established to correspond to [Th(X)(4)(HR(2))y]org, where X = NO(3)(-) and Y = 1 or 2, HR(2) = HDDPA molecule and R(2) = deprotonated HDDPA molecule. (C) 2010 King Saud University. All rights reserved.
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