Structural determination of neptunium redox species in aqueous solutions

Ikeda, Atsushi; Hennig, C.*; Rossberg, A.*; Funke, H.*; Scheinost, A. C.*; Bernhard, G.*; Yaita, Tsuyoshi

ESRF Highlights 2008, p.99 - 100, 2009/02

Structural arrangement of Np species has been investigated in various aqueous solutions by synchrotron-based X-ray absorption fine structure (XAFS) spectroscopy. The obtained results revealed that Np(IV) dominantly forms a spherically coordinated decahydrate complex, [Np(HO)], while Np(V) and -(VI) form a pentahydrate neptunyl complex, [NpO(HO)].