Aqueous biphasic systems for metal separations : a microcalorimetric analysis of polymer/salt interactions.

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Certain radionuclide ions (e.g., TcO{sub 4}{sup 16}) exhibit unusually strong Affinities toward the polymer-rich phase in aqueous biphase systems generated by combinations of salt solutions with polymers such as poly(ethylene glycol) (PEG) and poly(propylene glycol) (PPG). Thus, aqueous polymer phases could potentially be used to selectively extract these ions during pretreatment of radioactive tank wastes at Hanford. To help develop a fundamental understanding of the interactions between various ions and polymers in aqueous solution, interaction enthalpies between sodium perrhenate and a random copolymer of PEG and PPG (UCON-50) were measured by microcalorimetric titration. An entropy compensation effect was observed in ... continued below

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16 p.

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Chaiko, D. J.; Hatton, T. A. & Zaslavsky, B. May 3, 1999.

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Description

Certain radionuclide ions (e.g., TcO{sub 4}{sup 16}) exhibit unusually strong Affinities toward the polymer-rich phase in aqueous biphase systems generated by combinations of salt solutions with polymers such as poly(ethylene glycol) (PEG) and poly(propylene glycol) (PPG). Thus, aqueous polymer phases could potentially be used to selectively extract these ions during pretreatment of radioactive tank wastes at Hanford. To help develop a fundamental understanding of the interactions between various ions and polymers in aqueous solution, interaction enthalpies between sodium perrhenate and a random copolymer of PEG and PPG (UCON-50) were measured by microcalorimetric titration. An entropy compensation effect was observed in this system in which changes in enthalpic interactions were balanced by entropy changes such that the interaction free energy remained constant and approximately equal to zero.

Physical Description

16 p.

Notes

INIS; OSTI as DE00011789

Medium: P; Size: 16 pages

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  • Metal Separation Technologies Beyond 2000: Integrating Naval Chemistry with Processing, Oahu, HI (US), 06/13/1999--06/19/1999

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  • Report No.: ANL/CMT/CP-98943
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 11789
  • Archival Resource Key: ark:/67531/metadc620944

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Office of Scientific & Technical Information Technical Reports

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  • May 3, 1999

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  • June 16, 2015, 7:43 a.m.

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  • April 7, 2017, 3:14 p.m.

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Chaiko, D. J.; Hatton, T. A. & Zaslavsky, B. Aqueous biphasic systems for metal separations : a microcalorimetric analysis of polymer/salt interactions., article, May 3, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc620944/: accessed November 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.