Np(IV)/Np(V) valence determinations from Np L3 edge XANES/EXAFS

被引：43

作者：

Denecke, MA ^{[1
]}

Dardenne, K ^{[1
]}

Marquardt, CM ^{[1
]}

机构：

[1] Forschungszentrum Karlsruhe GMBH, Inst Nukl Entsorgung, D-76021 Karlsruhe, Germany

来源：

TALANTA | 2005年 / 65卷 / 04期

关键词：

valence determination; Np; XANES; EXAFS;

D O I：

10.1016/j.talanta.2004.08.034

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

X-ray absorption near edge structure (XANES) spectroscopy for in situ metal valence determination has become a powerful analytical tool in heterogeneous systems. This is in part because it is applicable without prior separation procedures. For some systems, however, determining the oxidation state from XANES spectra is not straightforward and caution must be used. We show that the analysis of L3,2 edge EXAFS (extended X-ray absorption fine structure) spectra is better suited to distinguish between Np(IV) and Np(V) than from their XANES spectra. Whereas evidence for the oxidation of Np(IV) in solution samples from their Np U XANES is unclear, their EXAFS data unequivocally reveals Np(V) formation in the solutions. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：1008 / 1014

页数：7

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