Open Access
Issue
BIO Web Conf.
Volume 14, 2019
The 12th International Conference on the Health Effects of Incorporated Radionuclides (HEIR 2018)
Article Number 06004
Number of page(s) 2
Section Medical Coutermeasures and Decorporation: Oral presentations
DOI https://doi.org/10.1051/bioconf/20191406004
Published online 07 May 2019

© The Authors, published by EDP Sciences, 2019

Licence Creative Commons
This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

The proposed exchange mechanism of +2 cations (Ca2+, Zn2+, etc.) with bone relies on a two compartment model[2], including ion exchange in the amorphous hydration shell and further ion diffusion into the mineral matrix. From our previous work and other researchers[3-6], bone apatite has high affinity to uranium. However, the two compartment model has not been applied to U exchange, and studies are complicated by the complex speciation of uranium in vivo. U(VI) in physiological fluids forms many inorganic complexes, such as with carbonate and calcium, and organic complexes, instead of “free” {UO22+}[7]. In our study, U(VI) is introduced in liquid containing carbonate ions in order to investigate the exchanges of U(VI)-carbonato complexes with the synthetic apatite stated above. Both the thermodynamics and the kinetics behaviors have been analyzed, and the exchange reversibility is further investigated. The apatite matrix after interaction with uranium is also characterized with various techniques, including electron microscopy (TEM and SEM) with energy dispersive X-ray spectroscopy, X-ray diffraction and Raman spectroscopy, to locate uranium and specify possible uranium incorporated phases. Furthermore, X-ray adsorption technique has been applied to study the uranium coordination mode on surface and in mineral, especially the uranium-containing complex specification. Finally, a solid/liquid exchange model is set and it will be employed to evaluate the influence of U(VI) chelators in liquid phase on solid/liquid exchange process, towards to further uranium detoxification studies.

References

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