Long-term sorption and desorption of uranium in saprolite subsoil with nanoporous goethite

Jung, Hun Bok; Xu, Huifang; Roden, Eric E.

doi:10.1016/j.apgeochem.2019.01.017

Long-term sorption and desorption of uranium in saprolite subsoil with nanoporous goethite

Journal Article · Fri Feb 01 04:00:00 EST 2019 · Applied Geochemistry

DOI:https://doi.org/10.1016/j.apgeochem.2019.01.017· OSTI ID:1610653

^[1]; Xu, Huifang ^[2]; Roden, Eric E. ^[2]

New Jersey City Univ., Jersey City, NJ (United States); DOE/OSTI
Univ. of Wisconsin, Madison, WI (United States)

Long-term (2–3 months) batch U(VI) sorption-desorption experiments were conducted to understand the long-term sorption-desorption behavior of U(VI) in saprolite subsoils from Oak Ridge Field Research Center (ORFRC), Tennessee, which contained naturally occurring nanoporous goethite. Three subsoil samples containing a range of dithionite-citrate-bicarbonate (DCB) extractable Fe oxide content (7138, 11,161, and 22,582 mg Fe/kg) were used for the experiments. Sorption of 50 μM U(VI) to the subsoils in the presence of Ca²⁺ and HCO₃^- at circumneutral pH occurred rapidly during the first 2 days, after which slow U(VI) sorption continued over 3 months. U(VI) desorption from the soils by 10 mM NaHCO₃ solution exhibited an initial fast desorption step during the first 24 h, followed by slower desorption over a week. Sorption of 50 μM U(VI) for 1 day to 3 months in the presence or absence of Ca²⁺ consistently resulted in higher U(VI) sorption to saprolite soil with higher amount of nanoporous goethite, while desorption of U(VI) for 1 week to 2 months was consistently lower in saprolite soil with higher amount of nanoporous goethite. Saprolite subsoils containing higher amounts of nanoporous goethite exhibited more resistant U(VI) desorption, and the proportions of irreversible U(VI) sorption increased with longer residence time with soils. These results indicates that more U(VI) became bound to the internal surfaces of nanoporous iron oxides during long-term sorption. This study suggests that naturally occurring nanoporous goethite may exert a significant role in controlling the mobility and transport of U(VI) in historically contaminated sites that have existed over decades.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: SC0002150

OSTI ID:: 1610653

Alternate ID(s):: OSTI ID: 1547790

Journal Information:: Applied Geochemistry, Journal Name: Applied Geochemistry Vol. 102; ISSN 0883-2927

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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54 ENVIRONMENTAL SCIENCES
desorption
nanoporous goethite
saprolite
sorption
uranium

Long-term sorption and desorption of uranium in saprolite subsoil with nanoporous goethite

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