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Spectroscopic verification of the mineralogy of an ultrathin mineral film on depleted uranium

journal contribution
posted on 26.11.2014 by Nils Baumann, Thuro Arnold, Harald Foerstendorf, David Read
The alteration of a depleted uranium (DU) disk in contact with a synthetic pore water, as a simulant for fertilized agricultural soil, was studied by exposing the DU to a calcium phosphate solution (2.5 × 10 M Ca, 1 × 10 M P). Within 12 months this contact resulted in the formation of a thin film of a secondary uranium mineral on the metallic DU. The reaction product was analyzed with both time-resolved laser-induced fluorescence spectroscopy (TRLFS) and infrared spectroscopy. Both techniques identified the reaction product on DU as a uranium(VI) phosphate phase, but only TRLFS provided its unequivocal identification as meta-autunite based on the positions of the fluorescence emission maxima at 487.8, 502.0, 523.6, 547.0, 572.1, and 600.6 nm and fluorescence lifetimes of 410 ± 15 and 3300 ± 310 ns. These results highlightthe enhanced performance and sensitivity of the TRLFS technique for mineralogical characterization of thin surface films. Furthermore, they demonstrate that the dissolution of uranium from DU projectiles under the conditions described here is limited by the development and solubility of a meta-autunite secondary phase. The findings have helped clarify the interactions of DU ammunition with phosphate-rich soil-water. © 2008 American Chemical Society.

History

School

  • Science

Department

  • Chemistry

Published in

Environmental Science and Technology

Volume

42

Issue

22

Pages

8266 - 8269

Citation

BAUMANN, N. ... et al., 2008. Spectroscopic verification of the mineralogy of an ultrathin mineral film on depleted uranium. Environmental Science and Technology, 42 (22), pp. 8266 - 8269.

Publisher

© American Chemical Society

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2008

Notes

Closed access.

ISSN

0013-936X

Language

en

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