Determination of tin equilibrium isotope fractionation factors from synchrotron radiation experiments
| Autor: | G. Hu, Konstantin S. Mineev, Veniamin B. Polyakov, S. D. Mineev, Robert N. Clayton |
|---|---|
| Přispěvatelé: | University of Groningen |
| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: |
CASSITERITE
Stable isotope ratio MOSSBAUER-SPECTROSCOPY Analytical chemistry Synchrotron radiation chemistry.chemical_element HEAT-CAPACITY NUCLEAR RESONANT SCATTERING SOLUBILITY INELASTIC ABSORPTION OXYGEN Isotope fractionation chemistry Transition metal Geochemistry and Petrology Oxidation state SYSTEMS Mössbauer spectroscopy Isotopes of tin DENSITY-OF-STATES Tin |
| Zdroj: | Geochimica et Cosmochimica Acta, 69(23), 5531-5536. PERGAMON-ELSEVIER SCIENCE LTD |
| ISSN: | 0016-7037 |
| Popis: | A method of determination of the reduced isotopic partition function ratio (β-factor) from the partial density of state (PDOS) obtained by inelastic nuclear resonant X-ray scattering (INRXS) in synchrotron radiation experiments has been established. The method has been demonstrated by the example of tin isotopes. The tin β-factors for CaSnO3, SnO2, SnO have been computed from the INRXS-derived PDOSs. ln β Sn 122 / 116 = ( 0.390 ± 0.0076 ) x − ( 0.00160 ± 0.0000242 ) x 2 + ( 1.099 ± 0.0573 ) ⋅ 10 − 5 x 3 ) for SnO ln β Sn 122 / 116 = ( 0.771 ± 0.0150 ) x − ( 0.00392 ± 0.000061 ) x 2 + ( 3.548 ± 0.287 ) ⋅ 10 − 5 x 3 for SnO 2 ln β Sn 122 / 116 = ( 0.776 ± 0.0157 ) x − ( 0.00334 ± 0.000064 ) x 2 + ( 2.561 ± 0.157 ) ⋅ 10 − 5 x 3 for CaSnO 3 Equilibrium 122/116Sn isotope fractionation between di- and tetravalent tin compounds is about 0.4‰ at 1000 K and about 4.1‰ at room temperature and can be measured by modern multicollector inductively-coupled plasma mass-spectrometers. Tin β-factors reveal dependence on oxidation state previously detected for iron isotopes. A comparison of the tin β-factors for SnO2 obtained on the basis of the INRXS-derived PDOS with those obtained by the Mossbauer spectroscopy method shows that both methods give similar results, but application of synchrotron radiation provides more accurate and reliable data. Equilibrium stable isotope fractionation of transition metals between different oxidation state compounds is not negligible even for elements as heavy as tin. |
| Databáze: | OpenAIRE |
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