Speciation of uranium(VI) sorption complexes on montmorillonite
Abstract
Environmental contaminant releases that contain uranium are among the most serious problems that must be confronted by restoration programs. To facilitate restoration, information concerning the speciation of uranium is needed. Under oxidizing conditions, dissolved uranium is predominantly in the U(VI) (uranyl) form and is quite mobile in the environment, however sorption onto soils may retard its movement. In this study, we have investigated the effects of changes in solution speciation on the nature of uranyl sorption complexes on montmorillonite, a common soil constituent. Aqueous U(VI) solutions between pH 3 to 7 were batch-equilibrated with montmorillonite for several days; specific pH values were selected such that the solutions consisted of dominantly monomeric, oligomeric, or a mix of monomeric and oligomeric aqueous uranyl species. Emission spectroscopy was used to investigate the nature of U(VI) sorbed to montmorillonite.
- Authors:
-
- Los Alamos National Lab., NM (United States)
- Fort Lewis Coll., Durango, CO (United States). Dept. of Chemistry
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE, Washington, DC (United States)
- OSTI Identifier:
- 10137357
- Report Number(s):
- LA-UR-92-1004; CONF-920761-10
ON: DE92011227
- DOE Contract Number:
- W-7405-ENG-36
- Resource Type:
- Conference
- Resource Relation:
- Conference: 7. water-rock interaction conference,Park City, UT (United States),9-23 Jul 1992; Other Information: PBD: [1992]
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; URANYL COMPLEXES; SORPTION; MONTMORILLONITE; SORPTIVE PROPERTIES; SOILS; RADIONUCLIDE MIGRATION; SURFACE AREA; EMISSION SPECTROSCOPY; PH VALUE; 540230; RADIOACTIVE MATERIALS MONITORING AND TRANSPORT
Citation Formats
Chisholm-Brause, C J, Morris, D E, and Richard, R E. Speciation of uranium(VI) sorption complexes on montmorillonite. United States: N. p., 1992.
Web.
Chisholm-Brause, C J, Morris, D E, & Richard, R E. Speciation of uranium(VI) sorption complexes on montmorillonite. United States.
Chisholm-Brause, C J, Morris, D E, and Richard, R E. 1992.
"Speciation of uranium(VI) sorption complexes on montmorillonite". United States. https://www.osti.gov/servlets/purl/10137357.
@article{osti_10137357,
title = {Speciation of uranium(VI) sorption complexes on montmorillonite},
author = {Chisholm-Brause, C J and Morris, D E and Richard, R E},
abstractNote = {Environmental contaminant releases that contain uranium are among the most serious problems that must be confronted by restoration programs. To facilitate restoration, information concerning the speciation of uranium is needed. Under oxidizing conditions, dissolved uranium is predominantly in the U(VI) (uranyl) form and is quite mobile in the environment, however sorption onto soils may retard its movement. In this study, we have investigated the effects of changes in solution speciation on the nature of uranyl sorption complexes on montmorillonite, a common soil constituent. Aqueous U(VI) solutions between pH 3 to 7 were batch-equilibrated with montmorillonite for several days; specific pH values were selected such that the solutions consisted of dominantly monomeric, oligomeric, or a mix of monomeric and oligomeric aqueous uranyl species. Emission spectroscopy was used to investigate the nature of U(VI) sorbed to montmorillonite.},
doi = {},
url = {https://www.osti.gov/biblio/10137357},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri May 01 00:00:00 EDT 1992},
month = {Fri May 01 00:00:00 EDT 1992}
}