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• W2796891766 abstract "Phosphate amendment has shown promise for enhancing uranium immobilization. The mechanism of the enhancement, however, has remained unclear with contrasting observations under variable environmental conditions. A dual-domain reactive transport model is developed here with constraints from batch and column experimental data to understand the mechanisms and to explore the effectiveness of enhanced U(VI) immobilization under variable geochemical and flow conditions. Modeling results indicate that under low U(VI) conditions in natural waters, phosphate addition promotes U(VI) immobilization through the formation of U(VI)–phosphate ternary surface complexes and the precipitation of calcium phosphate, both decreasing the concentrations of mobile U–Ca–CO3 aqueous complexes. This contrasts with previous hypotheses attributing the immobilization enhancement to U(VI)–phosphate precipitation under experimental conditions with high U(VI). Sensitivity analysis shows that phosphate is effective under relatively low Ca (<0.1 mM) and total inorganic carbon (TIC) (<0.5 mM) conditions, where >60% of U(VI) still remains on sediments after 113 residence times of flushing with low phosphate solutions (<0.1 mM). Under high Ca or TIC conditions, a similar level of U(VI) immobilization can be achieved only when the phosphate concentration is higher than Ca or TIC concentrations. Compared to the strong geochemical effects, flow conditions have relatively limited impacts on U(VI) immobilization. These results explain contrasting field observations on the effectiveness of phosphate amendment and offer capabilities to extrapolate observations to other environmental conditions." @default.
• W2796891766 created "2018-04-24" @default.
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• W2796891766 date "2018-04-12" @default.
• W2796891766 modified "2023-10-16" @default.
• W2796891766 title "Enhanced Uranium Immobilization by Phosphate Amendment under Variable Geochemical and Flow Conditions: Insights from Reactive Transport Modeling" @default.
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• W2796891766 doi "https://doi.org/10.1021/acs.est.7b05662" @default.
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