Assessment of calcium addition on the removal of U(VI) in the alkaline conditions created by NH3 gas

Katsenovich, Yelena; Cardona, Claudia M.; Szecsody, Jim E.; Lagos, Leonel; Tang, Walter Z.

doi:10.1016/j.apgeochem.2018.03.003

Cited by 9 publications

(2 citation statements)

References 31 publications

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“…Uranium speciation in contaminated soils, groundwater, vadose zones and bottom sediments of waste storage pools governs the migration behavior in plumes of mine tailings and legacy sites of nuclear weapon production (Zachara et al, 2013;Peterson et al, 2018;Kaplan et al, 2020;Stetten et al, 2020). Decommissioning of closed enterprises and decontamination of territories require knowledge of U species to predict U migration in the environment (Maher et al, 2013;Mehta, 2017;Katsenovich et al, 2018). The complexity of U behavior in the environment due to the presence of carbonates, organic matter, Fe oxides, bacterial activity etc.…”

Section: Introductionmentioning

confidence: 99%

From EXAFS of reference compounds to U(VI) speciation in contaminated environments

Krot¹,

Vlasova²,

Trigub³

et al. 2022

J Synchrotron Rad

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Understanding the speciation of technogenic uranium in natural systems is crucial for estimating U migration and bioavailability and for developing remediation strategies for contaminated territories. Reference EXAFS data of model laboratory-prepared uranium compounds (`standards') are necessary to analyze U-contaminated samples from nuclear legacy sites. To minimize errors associated with measurements on different synchrotrons, it is important not only to compare data obtained on environmentally contaminated samples with the literature but also with `standards' collected at the same beamline. Before recording the EXAFS spectra, all reference compounds were thoroughly characterized by Raman spectroscopy and powder X-ray diffraction. The U(VI) local molecular environments in the reference compounds, i.e. uranyl oxyhydroxides, phosphates, carbonates and uranates, were examined using XAFS. Based on the EXAFS fitting results obtained, including the nature of the bonding, interatomic distances and coordination numbers, parameters that are typical for a particular U compound were differentiated. Using data for `standards', U speciation in the sample of radioactively contaminated soil was determined to be a mixture of U oxyhydroxide and carbonate phases.

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Section: Introductionmentioning

confidence: 99%

From EXAFS of reference compounds to U(VI) speciation in contaminated environments

Krot¹,

Vlasova²,

Trigub³

et al. 2022

J Synchrotron Rad

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“…The calculated predictions by using the thermodynamic database (thermo-minteq) updated by Katsenovich et al (2018) and the complex stability constants in Eq. 1.9-1.11…”

Section: Interaction Of Humic Substances With Uraniummentioning

confidence: 99%

Unrefined Humic Substances as a Potential Low-cost Remediation Method for Groundwater Contaminated with Uranium in Acidic Conditions

Raymat¹

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All rights reserved. iv DEDICATION I dedicate this dissertation to God, my savior and source of hope, strength, and inspiration. I also dedicate this dissertation to Flora and José, my parents, and to Handell, my brother. I never could have done the present work without their unconditional love and support. I thank them for being there for me at all times and never let me falter even in my most difficult moments. Ad Maiorem Dei Gloriam v ACKNOWLEDGMENTS

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Phyllosilicate mineral dissolution upon alkaline treatment under aerobic and anaerobic conditions

Pietro

Emerson

Katsenovich

et al. 2020

Applied Clay Science

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Assessment of calcium addition on the removal of U(VI) in the alkaline conditions created by NH3 gas

Cited by 9 publications

References 31 publications

From EXAFS of reference compounds to U(VI) speciation in contaminated environments

From EXAFS of reference compounds to U(VI) speciation in contaminated environments

Unrefined Humic Substances as a Potential Low-cost Remediation Method for Groundwater Contaminated with Uranium in Acidic Conditions

Phyllosilicate mineral dissolution upon alkaline treatment under aerobic and anaerobic conditions

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