Laser and X-ray spectroscopic studies of uranium-calcite interface phenomena

被引：42

作者：

Geipel, G

Reich, T

Brendler, V

Bernhard, G

Nitsche, H

机构：

[1] Forschungszentrum Rossendorf e. V, Institut für Radiochemie, D-01314 Dresden

来源：

JOURNAL OF NUCLEAR MATERIALS | 1997年 / 248卷

关键词：

D O I：

10.1016/S0022-3115(97)00136-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Calcite (CaCO3) was treated with uranyl solutions of different concentrations in perchlorate medium at an initial pH of 6. X-ray photoelectron spectroscopy (XPS) measurements showed that there is no physi- or chemisorption of uranyl perchlorate molecules at the mineral surfaces and no diffusion of ClO4- anions into the mineral grains. We conclude this, because no chlorine atoms could be detected by XPS measurements. A significant amount of uranyl hydroxides is formed at the mineral surfaces. In addition, up to 20% of the calcium ions are exchanged by uranyl ions at the calcite surface. The inter-atomic uranium-oxygen distances of the reaction products at the mineral surface were determined using extended X-ray absorption fine structure (EXAFS) spectroscopy. In addition, the contacting solutions were studied by time-resolved laser-induced fluorescence spectroscopy (TRLFS). A new uranyl species was found in solution, which is also present in seepage waters from mine-tailing piles. (C) 1997 Elsevier Science B.V.

引用

页码：408 / 411

页数：4

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