Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science
Durabilité chimique de l'uraninite précipitée sur le grès du NavajoChemical durability of uraninite precipitated on Navajo sandstone
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Cited by (4)
Biogeochemical aspects of uranium mineralization, mining, milling, and remediation
2015, Applied GeochemistryCitation Excerpt :The mackinawite initially protected the reduced U(IV) from reoxidation. Whereas reduction of U by sulfides alone may be inhibited by carbonate and bicarbonate in groundwater (Abdelouas et al., 1998a), mackinawite is thought to buffer redox conditions such that reoxidation of the U(IV) solid will be mitigated (Abdelouas et al., 1998b, 1999). The dual role of Fe-sulfides as reductant and poising agent has been demonstrated in a study in which U(VI) was reduced to uraninite when adsorbed onto synthetic mackinawite under CO2-free conditions over a range of pH values (5–11) (Hyun et al., 2012).
Oxidative dissolution of UO<inf>2</inf> in a simulated groundwater containing synthetic nanocrystalline mackinawite
2013, Geochimica et Cosmochimica ActaCitation Excerpt :Results from field work implicated the role of sulfide minerals in stabilizing U(IV) species, despite seasonal exposure to air in natural near-surface sediments (Suzuki et al., 2005; Qafoku et al., 2009). Column studies have also indicated that mackinawite (FeS) produced by biostimulation of sulfate reducing bacteria (SRB) can retard UO2 reoxidation and possibly provide long-term protection against oxygen intrusion (Abdelouas et al., 1998, 1999a; Moon et al., 2009). Recently, the abiotic reduction of U(VI) by mackinawite surfaces has been carefully studied, which showed the production of reduced U(IV) solid phases (Hua and Deng, 2008; Hyun et al., 2012).
Rapid Mobilization of Noncrystalline U(IV) Coupled with FeS Oxidation
2016, Environmental Science and TechnologyUranium(VI) interactions with mackinawite in the presence and absence of bicarbonate and oxygen
2013, Environmental Science and Technology