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Geochemical Journal
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Application of MV-edge XANES to determination of U oxidation state in zircon

Kazuya Tanaka, Yoshio Takahashi
Geochemical Journal, Vol. 53, No. 5, P. 329-331, 2019

ABSTRACT

We examined three natural zircon samples with different amounts of radiation doses (1.9 × 1015–6.8 × 1015 α-decay events/mg) using MV-edge and LIII-edge U X-ray absorption near-edge structure (XANES). Analysis of XANES spectra at both MV-edge and LIII-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 MV-edge U XANES to the oxidation state of U in natural zircon.

KEYWORDS

oxidation state, U, MV-edge XANES, zircon

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