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![[Figure 2]](ok5066fig2mag.jpg)
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Figure 2
LIII-edge XANES spectra collected on frozen solutions of (a) Pu(III)-343-HOPO and (b) Bk(III)-343-HOPO (purple traces). The vertical dashed lines in (a) highlight the white-line position (EWL) for oxidation-state references Pu(III) and Pu(IV) in 1 M HClO4 solutions (Conradson et al., 2004  ), which have been calibrated to the Zr K-edge (Kraft et al., 1996). The XANES data for Bk(III)-DTPA (blue trace) is plotted in (b) for comparison, along with the Bk(III)-DTPA EWL position (vertical dashed line). In addition, an estimated EWL position of a hypothetical Bk(IV)-DTPA complex (vertical dashed line) is shown as a Bk(IV) oxidation state reference. The estimate of the Bk(IV)-DTPA EWL was calculated as a +5.5 eV shift from the Bk(III)-DTPA white line as was observed in the electrochemical oxidation of Bk(III) to Bk(IV) in 1 M HClO4 acidic solution (Antonio et al., 2002). |
![[Figure 2]](ok5066fig2.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
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