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Application of M$$_{V}$$-edge XANES to determination of U oxidation state in zircon

Tanaka, Kazuya ; Takahashi, Yoshio*

We examined three natural zircon samples with different amounts of radiation doses using M$$_{V}$$-edge and L$$_{III}$$-edge U X-ray absorption near-edge structure (XANES). Analysis of XANES spectra at both M$$_{V}$$-edge and L$$_{III}$$-edge suggested that the oxidation state of U in the zircon sample with the highest radiation dose is tetravalent. The XANES spectra of the two other samples with lower radiation doses suggested a mixture of U(IV) and U(VI), while the possibility of U(V) was not excluded. This is the first work on the application of M$$_{V}$$-edge U XANES to the oxidation state of U in natural zircon.

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Category:Geochemistry & Geophysics

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