Incorporation of Np(V) and U(VI) in Carbonate and Sulfate Minerals Crystallized from Aqueous Solution

Journal Article · Sun Feb 15 04:00:00 EST 2015 · Geochimica et Cosmochimica Acta, 151:133-149

DOI:https://doi.org/10.1016/j.gca.2014.10.027· OSTI ID:1170042

Balboni, Enrica; Morrison, Jessica M.; Wang, Zheming; Engelhard, Mark H.; Burns, Peter C.

The neptunyl Np(V)O2 + and uranyl U(VI)O2 2+ ions are soluble in groundwater, although their interaction with minerals in the subsurface may impact their mobility. One mechanism for the immobilization of actinyl ions in the subsurface is coprecipitation in low-temperature minerals that form naturally, or that are induced to form as part of a remediation strategy. Important differences in the crystal-chemical behavior of the Np(V) neptunyl and U(VI) uranyl ions suggest their behavior towards incorporation into growing crystals may differ significantly. Using a selection of low temperature minerals synthesized in aqueous systems under ambient conditions, this study examines the factors that impact the structural incorporation of the Np(V) neptunyl and U(VI) uranyl ions in carbonate and sulfate minerals.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1170042
• Report Number(s): PNNL-SA-105318; 47892; KP1704020
• Journal Information: Geochimica et Cosmochimica Acta, 151:133-149, Journal Name: Geochimica et Cosmochimica Acta, 151:133-149
• Country of Publication: United States
• Language: English

Related Subjects

Environmental Molecular Sciences Laboratory