Coprecipitation of Uranium (VI) with Calcite: XAFS, Micro-XAS,and Luminescence Characterization

Journal Article · Fri Apr 06 00:00:00 EDT 2001 · Geochimica et Cosmochimica Acta, 65(20):3491-3503

DOI:https://doi.org/10.1016/S0016-7037(01)00647-0· OSTI ID:15001387

Reeder, Richard J; Nugent, Melissa; Tait, C DREW; Morris, David E; Heald, Steve M; Beck, Kenneth M; Hess, Wayne P; Lanzirotti, Anthony

X-ray absorption and luminescence spectroscopies have been used to characterize the local structure and coordination of uranium (VI) species coprecipitated with calcite (CaCO3) in room-temperature aqueous solutions. Different solution chemistries and pHs are found to result in defferences in the equatorial coordination of the uranyl species (UO2/2+) in the calcite, with multiple coordination environments of uranyl evident in one sample.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 15001387
• Report Number(s): PNNL-SA-34282; KP1301020
• Journal Information: Geochimica et Cosmochimica Acta, 65(20):3491-3503, Journal Name: Geochimica et Cosmochimica Acta, 65(20):3491-3503
• Country of Publication: United States
• Language: English