Calcium isotope separation by chemical exchange with polymer-bound crown compounds

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Chromatographic separation of calcium isotopes by chemical exchange with polymer-bound 18-crown-6 was investigated. The breakthrough technique of column chromatography was employed to determine the influence of solvent composition and ligand-tether structure on separation coefficients and heterogeneous calcium complex stability. The separation coefficient, {epsilon}, was found to be strongly dependent upon solvent composition. An {epsilon} of 0. 0025{plus minus}0.0002 (95% C.L.) for the {sup 44}Ca/{sup 40}Ca isotope pair was obtained with a 70/30 (by volume) methanol/chloroform solvent mixture at 20.0{degree}C. Differences in the structure of the tether binding the crown ring to the polymer had no influence on {epsilon} at that ... continued below

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Pages: (25 p)

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Jepson, B.E. January 1, 1990.

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Description

Chromatographic separation of calcium isotopes by chemical exchange with polymer-bound 18-crown-6 was investigated. The breakthrough technique of column chromatography was employed to determine the influence of solvent composition and ligand-tether structure on separation coefficients and heterogeneous calcium complex stability. The separation coefficient, {epsilon}, was found to be strongly dependent upon solvent composition. An {epsilon} of 0. 0025{plus minus}0.0002 (95% C.L.) for the {sup 44}Ca/{sup 40}Ca isotope pair was obtained with a 70/30 (by volume) methanol/chloroform solvent mixture at 20.0{degree}C. Differences in the structure of the tether binding the crown ring to the polymer had no influence on {epsilon} at that solvent composition. 8 refs., 5 figs., 1 tab.

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Pages: (25 p)

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OSTI; NTIS; GPO Dep.

Source

  • International symposium on isotope separation and chemical exchange uranium enrichment, Tokyo (Japan), 29-31 Oct 1990

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  • Other: DE91006444
  • Report No.: MLM-3675(OP)
  • Report No.: CONF-9010294--1
  • Grant Number: AC04-88DP43495
  • Office of Scientific & Technical Information Report Number: 6081331
  • Archival Resource Key: ark:/67531/metadc1107182

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 1990

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  • Feb. 22, 2018, 7:45 p.m.

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  • April 26, 2018, 7:42 p.m.

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Jepson, B.E. Calcium isotope separation by chemical exchange with polymer-bound crown compounds, article, January 1, 1990; United States. (https://digital.library.unt.edu/ark:/67531/metadc1107182/: accessed March 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.