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Title: Spectroscopic characterization of uranium in evaporation basin sediments

Abstract

Evaporation ponds in the San Joaquin Valley (SJV), CA, used for the containment of irrigation drainage waters contain elevated levels of uranium (U) resulting from the extensive leaching by carbonate-rich irrigation waters of the local agricultural soils that contain low levels of naturally-occurring U. The SJV ponds are subjected to changes in redox chemistry with cycles of drying and flooding. Past studies have shown that U in the SJV Pont 14 surface sediments is present as mostly the oxidized and soluble form, U(VI). However, the authors were uncertain whether the U in the soil was only present as a U oxide of mixed stoichiometry, such as U{sub 3}O{sub 8(s)} (pitchblende) or other species. Here they present characterization information, which includes wet chemical and in situ spectroscopic techniques (X-ray absorption near-edge structure (XANES) and low temperature time-resolved luminescence spectroscopies) for samples from two SJV Pond sediments. Surface sediments from SJV Pont 16 were characterized for average oxidation state of U with XANES spectroscopy. The wet chemical extractions and in situ spectroscopic techniques provided fundamental and basic knowledge about the fraction of U(IV) to U(VI), the speciation of luminescent U(VI), and the susceptibility of the sediment U species to leaching.

Authors:
; ; ;
Publication Date:
Research Org.:
Univ. of Georgia, Aiken, SC (US)
Sponsoring Org.:
USDOE
OSTI Identifier:
20062614
DOE Contract Number:  
FC09-96SR18546; FG02-92ER14244
Resource Type:
Journal Article
Journal Name:
Geochimica et Cosmochimica Acta
Additional Journal Information:
Journal Volume: 64; Journal Issue: 9; Other Information: PBD: May 2000; Journal ID: ISSN 0016-7037
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; CALIFORNIA; SETTLING PONDS; URANIUM; NATURAL RADIOACTIVITY; LEACHING; RADIOECOLOGICAL CONCENTRATION; GEOCHEMISTRY

Citation Formats

Duff, M.C., Morris, D.E., Hunter, D.B., and Bertsch, P.M. Spectroscopic characterization of uranium in evaporation basin sediments. United States: N. p., 2000. Web. doi:10.1016/S0016-7037(99)00410-X.
Duff, M.C., Morris, D.E., Hunter, D.B., & Bertsch, P.M. Spectroscopic characterization of uranium in evaporation basin sediments. United States. doi:10.1016/S0016-7037(99)00410-X.
Duff, M.C., Morris, D.E., Hunter, D.B., and Bertsch, P.M. Mon . "Spectroscopic characterization of uranium in evaporation basin sediments". United States. doi:10.1016/S0016-7037(99)00410-X.
@article{osti_20062614,
title = {Spectroscopic characterization of uranium in evaporation basin sediments},
author = {Duff, M.C. and Morris, D.E. and Hunter, D.B. and Bertsch, P.M.},
abstractNote = {Evaporation ponds in the San Joaquin Valley (SJV), CA, used for the containment of irrigation drainage waters contain elevated levels of uranium (U) resulting from the extensive leaching by carbonate-rich irrigation waters of the local agricultural soils that contain low levels of naturally-occurring U. The SJV ponds are subjected to changes in redox chemistry with cycles of drying and flooding. Past studies have shown that U in the SJV Pont 14 surface sediments is present as mostly the oxidized and soluble form, U(VI). However, the authors were uncertain whether the U in the soil was only present as a U oxide of mixed stoichiometry, such as U{sub 3}O{sub 8(s)} (pitchblende) or other species. Here they present characterization information, which includes wet chemical and in situ spectroscopic techniques (X-ray absorption near-edge structure (XANES) and low temperature time-resolved luminescence spectroscopies) for samples from two SJV Pond sediments. Surface sediments from SJV Pont 16 were characterized for average oxidation state of U with XANES spectroscopy. The wet chemical extractions and in situ spectroscopic techniques provided fundamental and basic knowledge about the fraction of U(IV) to U(VI), the speciation of luminescent U(VI), and the susceptibility of the sediment U species to leaching.},
doi = {10.1016/S0016-7037(99)00410-X},
journal = {Geochimica et Cosmochimica Acta},
issn = {0016-7037},
number = 9,
volume = 64,
place = {United States},
year = {2000},
month = {5}
}