Authors:
K. Lohitakshan Bhabha Atomic Research Centre Fuel Chemistry Division Trombay 400 085 Bombay (India)

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P. Mithapara Bhabha Atomic Research Centre Fuel Chemistry Division Trombay 400 085 Bombay (India)

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P. Nair Bhabha Atomic Research Centre Fuel Chemistry Division Trombay 400 085 Bombay (India)

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S. Pai Bhabha Atomic Research Centre Fuel Chemistry Division Trombay 400 085 Bombay (India)

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K. Raghuraman Bhabha Atomic Research Centre Fuel Chemistry Division Trombay 400 085 Bombay (India)

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A. Jadhav Bhabha Atomic Research Centre Fuel Chemistry Division Trombay 400 085 Bombay (India)

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H. Jain Bhabha Atomic Research Centre Fuel Chemistry Division Trombay 400 085 Bombay (India)

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Abstract  

Extraction of trivalent (Pu3+, Am3+, actinides and Eu3+, a representative of lanthanides) and tetravalent (Np4+ and Pu4+) actinides has been studied with dihexyl N,N-di-ethylcarbamoylmethyl phosphonate (DHDECMP) in combination with TBP in benzene from 2M nitric acid. The stoichiometries of the species extracted were found to be M(NO3)3·(3–n) TBP·n DHDECMP (for trivalent ions) and M(NO3)4·(2–n) TBP·n DHDECMP (for tetravalent ions) by the slope ratio method. The extraction constants evaluated (from the distribution data) indicate that for tetravalent ions (with solvation number two) the extraction constant increases when TBP (Kh=0.17) molecules are successively replaced by more basic DHDECMP (Kh=0.34) molecules. However, for trivalent ions (with solvation number three) when TBP molecules are totally replaced by DHDECMP molecules stereochemical factors appear and instead of increase, a substantial decrease in extraction constants is observed for Eu3+ and Am3+, a lesser decrease being observed for Pu3+ (larger ion).

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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)