Deep anoxic aquifers could act as sinks for uranium through microbial-assisted mineral trapping

Pidchenko, Ivan N.; Christensen, John N.; Kutzschbach, Martin; Ignatyev, Konstantin; Puigdomenech, Ignasi; Tullborg, Eva-Lena; Roberts, Nick M. W.; Rasbury, E. Troy; Northrup, Paul; Tappero, Ryan; Kvashnina, Kristina O.; Schäfer, Thorsten; Suzuki, Yohey; Drake, Henrik

doi:10.1038/s43247-023-00767-9

Title: Deep anoxic aquifers could act as sinks for uranium through microbial-assisted mineral trapping

Journal Article · 21 April 2023 · Communications Earth & Environment

DOI: https://doi.org/10.1038/s43247-023-00767-9 · OSTI ID:1988605

Pidchenko, Ivan N. ^[1]; Christensen, John N. ^[2]; Kutzschbach, Martin ^[3];

^[4];

^[5]; Tullborg, Eva-Lena ^[6];

^[7];

^[8];

^[8]; Tappero, Ryan ^[9]; Kvashnina, Kristina O. ^[10]; Schäfer, Thorsten ^[11];

^[12];

^[1]

Linnaeus University (Sweden)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Technische Univ. Berlin (Germany)
Harwell Science and Innovation Campus (United Kingdom)
Swedish Nuclear Fuel and Waste Management Co. (Sweden)
Terralogica AB (Sweden)
British Geological Survey (United Kingdom)
Stony Brook Univ., NY (United States)
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source (NSLS)
Helmholtz-Zentrum Dresden-Rossendorf (Germany); European Synchrotron Radiation Facility (ESRF), Grenoble (France)
Friedrich Schiller Univ., Jena (Germany)
Univ. of Tokyo (Japan)

Uptake of uranium (U) by secondary minerals, such as carbonates and iron (Fe)-sulfides, that occur ubiquitously on Earth, may be substantial in deep anoxic environments compared to surficial settings due to different environment-specific conditions. Yet, knowledge of U reductive removal pathways and related fractionation between ²³⁸U and ²³⁵U isotopes in deep anoxic groundwater systems remain elusive. Here we show bacteria-driven degradation of organic constituents that influences formation of sulfidic species facilitating reduction of geochemically mobile U(VI) with subsequent trapping of U(IV) by calcite and Fe-sulfides. The isotopic signatures recorded for U and Ca in fracture water and calcite samples provide additional insights on U(VI) reduction behaviour and calcite growth rate. The removal efficiency of U from groundwater reaching 75% in borehole sections in fractured granite, and selective U accumulation in secondary minerals in exceedingly U-deficient groundwater shows the potential of these widespread mineralogical sinks for U in deep anoxic environments.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704; AC02-05CH11231

OSTI ID:: 1988605

Report Number(s):: BNL-224564-2023-JAAM

Journal Information:: Communications Earth & Environment, Vol. 4, Issue 1; ISSN 2662-4435

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Deep anoxic aquifers could act as sinks for uranium through microbial-assisted mineral trapping

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