The distribution behavior of uranium and thorium has been investigated in a biphasic system of different aqueous nitric acid concentrations and a solution of tris(2-ethylhexyl) phosphate (TEHP) in n-dodecane at 25 ~ The effect of different uranium and thorium concentrations in the aqueous phase on the extraction of these metal ions is evaluated. These results indicate that TEHP is a better choice than tri-n-butyl phosphate (TBP) for the separation of 233U from the irradiated thorium matrix.
A kinetic investigation on the reaction (1) has been carried out in HCIOa medium under different conditions. method of estimation of nitrous acid at various time intervals has been employed. are interpreted on the basis of the following mechanism:The results
HNOl + H+ HZNO' ;H,NOi + H202 HOONO + H i 0The absolute rate constant value of 39.7~W-~ . s-' for kp and the equilibrium constant K,, = 116M-1 for reaction (2) have been evaluated. The activation energy of the overall reaction has also been determined as E, = 13.2 kcal/mol.
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