Quantification of kinetic rate law parameters for the dissolution of natural autunite in the presence of aqueous bicarbonate ions at high concentrations

Gudavalli, Ravi; Katsenovich, Yelena; Wellman, Dawn

doi:10.1016/j.jenvrad.2018.04.007

Title: Quantification of kinetic rate law parameters for the dissolution of natural autunite in the presence of aqueous bicarbonate ions at high concentrations

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Authors:: Gudavalli, Ravi; Katsenovich, Yelena; Wellman, Dawn

Publication Date:: Mon Oct 01 00:00:00 EDT 2018

Sponsoring Org.:: USDOE

OSTI Identifier:: 1548189

Grant/Contract Number:: EM0000598

Resource Type:: Publisher's Accepted Manuscript

Journal Name:: Journal of Environmental Radioactivity

Additional Journal Information:: Journal Name: Journal of Environmental Radioactivity Journal Volume: 190-191 Journal Issue: C; Journal ID: ISSN 0265-931X

Publisher:: Elsevier

Country of Publication:: United Kingdom

Language:: English

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                    Gudavalli, Ravi, Katsenovich, Yelena, and Wellman, Dawn. Quantification of kinetic rate law parameters for the dissolution of natural autunite in the presence of aqueous bicarbonate ions at high concentrations.  United Kingdom: N. p., 2018. 
Web.  doi:10.1016/j.jenvrad.2018.04.007.

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                    Gudavalli, Ravi, Katsenovich, Yelena, & Wellman, Dawn. Quantification of kinetic rate law parameters for the dissolution of natural autunite in the presence of aqueous bicarbonate ions at high concentrations.  United Kingdom.  https://doi.org/10.1016/j.jenvrad.2018.04.007

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                    Gudavalli, Ravi, Katsenovich, Yelena, and Wellman, Dawn. Mon .  
"Quantification of kinetic rate law parameters for the dissolution of natural autunite in the presence of aqueous bicarbonate ions at high concentrations".  United Kingdom.  https://doi.org/10.1016/j.jenvrad.2018.04.007.

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@article{osti_1548189,

  title        = {Quantification of kinetic rate law parameters for the dissolution of natural autunite in the presence of aqueous bicarbonate ions at high concentrations},

  author       = {Gudavalli, Ravi and Katsenovich, Yelena and Wellman, Dawn},

  abstractNote = {},

  doi          = {10.1016/j.jenvrad.2018.04.007},

  journal      = {Journal of Environmental Radioactivity},

  number       = C,

  volume       = 190-191,

  place        = {United Kingdom},

  year         = {Mon Oct 01 00:00:00 EDT 2018},

  month        = {Mon Oct 01 00:00:00 EDT 2018}

}

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https://doi.org/10.1016/j.jenvrad.2018.04.007

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Quantification of kinetic rate law parameters for the dissolution of natural autunite in the presence of aqueous bicarbonate ions at high concentrations

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Bicarbonate is one of the most significant components within the uranium geochemical cycle. In aqueous solutions, bicarbonate forms strong complexes with uranium. As such, aqueous bicarbonate may significantly increase the rate of uranium release from uranium minerals. Quantifying the relationship of aqueous bicarbonate concentration to the rate of uranium release during dissolution is critical to understanding the long-term fate of uranium within the environment. Single-pass flow-through (SPTF) experiments were conducted to estimate the rate of uranium release from Na meta-autunite as a function of bicarbonate (0.0005-0.003 M) under the pH range of 6-11 and a temperature range of 5-60oC. Consistentmore »« less
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ABSTRACT: Hydrogen carbonate is one of the most significant components within the uranium geochemical cycle. In aqueous solutions, hydrogen carbonate forms strong complexes with uranium. As such, aqueous bicarbonate may significantly increase the rate of uranium release from uranium minerals. Quantifying the relationship of aqueous hydrogen carbonate solutions to the rate of uranium release during dissolution is critical to understanding the long-term fate of uranium within the environment. Single-pass flow-through (SPTF) experiments were conducted to estimate the rate of uranium release from Na meta-autunite as a function of bicarbonate solutions (0.0005-0.003 M) under the pH range of 6-11 and temperaturesmore »« less
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