Separation of Zinc Isotopes by Liquid-Liquid Extraction Using a Crown Ether
| Autor: | Masao Nomura, Tadashi Yamamoto, Takahito Miki, Kazushige Nishizawa, Tomonori Satoyama |
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| Rok vydání: | 1996 |
| Předmět: |
Mass number
Isotope Process Chemistry and Technology General Chemical Engineering Extraction (chemistry) Analytical chemistry chemistry.chemical_element Filtration and Separation General Chemistry Zinc Isotope separation law.invention chemistry law Isotopes of zinc Enrichment factor Isotopes of magnesium Nuclear chemistry |
| Zdroj: | Separation Science and Technology. 31:2831-2841 |
| ISSN: | 1520-5754 0149-6395 |
| DOI: | 10.1080/01496399608000830 |
| Popis: | The zinc isotope effect in a liquid-liquid extraction system using dicyclohexano-18-crown-6 was investigated. The enrichment factor for a unit difference of mass number was ∊u = 0.018 as a maximum, which is greater than that for magnesium isotopes. The enrichment factor to eliminate 64Zn from 66Zn, 67Zn, 68Zn, or 70Zn is over 0.036. The isotope with an odd mass number, 67Zn, behaved differently from those with even mass numbers. This odd/even isotope effect was ∊O/E = 0.056. From the values of ∊u and ∊O/E, it was found that the crown ether separated the zinc isotopes more effectively on the basis of an odd or an even mass number than of mass difference. The separation factors vary with the concentrations of salt and/or conjugated acid in the initial aqueous phases of extraction. The optimal concentration necessary to obtain the largest separation factor had components of 2.0 M ZnCl2 and 1.0 M HCl. The large value of ∊u for the high atomic number zinc and the notable ∊O/E make it clear that the vi... |
| Databáze: | OpenAIRE |
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