N-oxides of 4-(5-nonyl)pyridine and trioctylamine as extractants for cerium(IV) and its separation from thorium(IV) |
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| Authors: | M Ejaz |
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| Institution: | (1) Department of Nuclear and Radiation Chemistry, University of New South Wales, Kensington, Australia;(2) Present address: Nuclear Chemistry Division, Pakistan Institute of Nuclear Science and Technology, P. O. Nilore, Rawalpindi, Pakistan |
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| Abstract: | Trace level cerium has been oxidized to the quadrivalent state with potassium dichromate and shown to be preferentially extracted
from very dilute mineral acid solutions and also from moderate nitric acid media by 0.1M solutions of 4-(5-nonyl)pyridine
oxide and trioctylamine oxide dissolved in xylene. The dependence of extraction on the type of N-oxide, acid concentration
and the N-oxide concentration has been investigated. The influence of the concentration of salting-out agents is described.
Separation factors for a number of metal ions relative to cerium(IV) are reported for 0.1 M 4-(5-nonyl)pyridine oxide/xylene-0.1M
sulphuric acid system. The ratio of the D for Ce(IV) to that of Ce(III) is greater than 105, and the D for Ce(IV) is much greater than that for thorium(IV). Separation of cerium(IV) from thorium has been achieved
from 0.1M sulphuric acid solutions using 0.1M 4-(5-nonyl)pyridine oxide/xylene as an extractant. |
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