Chemical status of U(VI) in cemented waste forms under saline conditions

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Publication Details

Output type: Journal article

Author list: Kienzler B., Metz V., Brendebach B., Finck N., Plaschke M., Rabung T., Rothe J., Schild D.

Publisher: De Gruyter

Publication year: 2010

Volume number: 98

Issue number: 9-11

Start page: 675

End page: 684

Number of pages: 10

ISSN: 0033-8230

eISSN: 2193-3405

URL: http://api.elsevier.com/content/abstract/scopus_id:79951667136

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Open access status: closed

Abstract

Retention of U(VI) in cemented waste forms reacting with NaCl and MgCl
brines is investigated in longterm leaching experiments on full scale monoliths. Solution compositions were monitored over a period of 17 to 18 years. After termination of the leaching experiments, chemical and mineralogical compositions of solid reaction products were studied intensively. XRD, TRLFS and XANES/EXAFS analyses indicate uranophane (Ca(UO
)
(SiO
OH)
·5H
O) to be the dominant uranium bearing phase in the corroded cement. Other possible uranium phases such as soddyite, metaschoepite, and di-uranate phases could not be identified by combining the results of the various experimental techniques. © by Oldenbourg Wissenschaftsverlag, München.

Keywords

Brine, Cement, Retention, Uranium

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