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Title: Mechanism of astatine and bismuth sorption on extraction chromatography resins from nitric acid media

Journal Article · · Chemical Engineering Journal
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  1. Texas A&M University, College Station, TX (United States)
  2. University of Alabama at Birmingham, AL (United States)
  3. New Jersey Institute of Technology, Newark, NJ (United States)
  4. University of Dallas, Irving, TX (United States)

Systematic study of astatine (At) sorption on extraction chromatography resins from nitric acid media has been performed at Texas A&M University. This work covers commercially available resins such as LN, TK400, SR, TRU, and UTEVA. Acquiring an understanding of At behavior in up to 4 M HNO3 solutions is a key step to develop a rapid and reliable system for At separation and purification. The determined distribution coefficients are greater than 20 for all the resins studied, reaching 400 for TRU and UTEVA resins. The sorption uptake decreases in the order: TRU ≳ UTEVA >TK400 ≳ SR >LN. For each resin a thermodynamic model has been developed to suggest a possible mechanism of At sorption and corresponding sorption constants have been estimated. Literature data along with new results on bismuth (Bi) sorption by studied resins in nitric acid media have been reviewed and a mathematical model to describe its behavior has been suggested. A ratio of corresponding fit functions of At and Bi assigned to the same resin and acidity has been used to estimate separation factors of these elements. Furthermore, only the TRU resin is not suitable for efficient At isolation from Bi, while the other four resins demonstrate promising results.

Research Organization:
Texas A & M Univ., College Station, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Office of Isotope R&D and Production (IRP)
Grant/Contract Number:
SC0020958; FG02-93ER40773
OSTI ID:
2248038
Journal Information:
Chemical Engineering Journal, Vol. 464; ISSN 1385-8947
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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