Authors:
D. Phal Bhabha Atomic Research Centre Fuel Chemistry Division Trombay 400 085 Mumbai (India)

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S. Kannan Bhabha Atomic Research Centre Fuel Chemistry Division Trombay 400 085 Mumbai (India)

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V. Ramakrishna Bhabha Atomic Research Centre Fuel Chemistry Division Trombay 400 085 Mumbai (India)

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S. Patil Bhabha Atomic Research Centre Fuel Chemistry Division Trombay 400 085 Mumbai (India)

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Abstract  

Extraction of plutonium(IV) from aqueous sulfuric and sulfuric-nitric acid into di-2-ethylhexyl phosphoric acid (HY) in the diluents n-dodecane, toluene or chloroform has been investigated. The composition of the Pu(IV) species extracted from H2SO4 was found to be PuH2Y6, which changed to Pu(NO3)H2Y5 and Pu(NO3)2H2Y4 with increasing concentration of nitrate ion in the aqueous medium. These three species can be represented as PuY2(HY2)2, Pu(NO3)Y(HY2)2 and Pu(NO3)2(HY2)2, respectively, where Y represents the anion of monomeric HY, and HY2 the anion of dimeric H2Y2. Synergism in the extraction of Pu(IV) by the addition of thenoyltrifluoroacetone (HTTA) to HY was also investigated and attributed to extraction of the additional species, Pu(TTA)Y(HY2)2 and Pu(TTA)2(HY2)2. The addition of the neutral extractant tri-n-octylphosphine oxide (TOPO) to HY did not result in synergism in the extraction of Pu(IV) from aqueous sulfuric acid. With aqueous nitric acid under similar conditions, however, synergism was observed. The possible equilibria in these systems were identified and the corresponding equilibrium constants were determined.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)