We observed a decreasing trend of branching ratios for the set of standards, uraninite for U(IV), UMoO 5 for U(V) and UO 3 for U(VI), from 0.6956, 0.6887 to 0.6640 (median values from 10–13 measurements), providing a reliable reference set to resolve U valence states (Fig. 7 ; Supplementary Table 3 ).
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Nanoscale mechanism of UO<sub>2</sub> formation through uranium reduction by magnetite.
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