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Uranium(VI) Adsorption and Surface Complexation Modeling onto Background Sediments from the F-Area Savannah River Site.

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Title: Uranium(VI) Adsorption and Surface Complexation Modeling onto Background Sediments from the F-Area Savannah River Site.
Authors: Dong, Wenming1, Tokunaga, Tetsu K.1, Davis, James A.1, Wan, Jiamin1 jwan@lbl.gov
Source: Environmental Science & Technology. 2/7/2012, Vol. 46 Issue 3, p1565-1571. 7p.
Subjects: Uranium absorption & adsorption, Migration of uranium, Adsorption (Chemistry), Mathematical models, Goethite, Kaolinite, Sediment analysis, Savannah River Site (S.C.)
Geographic Terms: South Carolina
Abstract: The mobility of an acidic uranium waste plume in the F-Area of Savannah River Site is of great concern. In order to understand and predict uranium mobility, U(VI) adsorption experiments were performed as a function of pH using background F-Area aquifer sediments and reference goethite and kaolinite (major reactive phases of F-Area sediments), and a component-additivity (CA) based surface complexation model (SCM) was developed. Our experimental results indicate that the fine fractions (≤45 μm) in sediments control U(VI) adsorption due to their large surface area, although the quartz sands show a stronger adsorption ability per unit surface area than the fine fractions at pH < 5.0. Kaolinite is a more important sorbent for U(VI) at pH < 4.0, while goethite plays a major role at pH > 4.0. Our CA model combines an existing U(VI) SCM for goethite and a modified U(VI) SCM for kaolinite along with estimated relative surface area abundances of these component minerals. The modeling approach successfully predicts U(VI) adsorption behavior by the background F-Area sediments. The model suggests that exchange sites on kaolinite dominate U(VI) adsorption at pH < 4.0, goethite and kaolinite edge sites cocontribute to U(VI) adsorption at pH 4.0-6.0, and goethite dominates U(VI) adsorption at pH > 6.0. [ABSTRACT FROM AUTHOR]
Copyright of Environmental Science & Technology is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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  Data: Uranium(VI) Adsorption and Surface Complexation Modeling onto Background Sediments from the F-Area Savannah River Site.
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Environmental+Science+%26+Technology%22&quot;&gt;Environmental Science &amp; Technology&lt;/searchLink&gt;. 2/7/2012, Vol. 46 Issue 3, p1565-1571. 7p.
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  Data: The mobility of an acidic uranium waste plume in the F-Area of Savannah River Site is of great concern. In order to understand and predict uranium mobility, U(VI) adsorption experiments were performed as a function of pH using background F-Area aquifer sediments and reference goethite and kaolinite (major reactive phases of F-Area sediments), and a component-additivity (CA) based surface complexation model (SCM) was developed. Our experimental results indicate that the fine fractions (≤45 μm) in sediments control U(VI) adsorption due to their large surface area, although the quartz sands show a stronger adsorption ability per unit surface area than the fine fractions at pH &lt; 5.0. Kaolinite is a more important sorbent for U(VI) at pH &lt; 4.0, while goethite plays a major role at pH &gt; 4.0. Our CA model combines an existing U(VI) SCM for goethite and a modified U(VI) SCM for kaolinite along with estimated relative surface area abundances of these component minerals. The modeling approach successfully predicts U(VI) adsorption behavior by the background F-Area sediments. The model suggests that exchange sites on kaolinite dominate U(VI) adsorption at pH &lt; 4.0, goethite and kaolinite edge sites cocontribute to U(VI) adsorption at pH 4.0-6.0, and goethite dominates U(VI) adsorption at pH &gt; 6.0. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Environmental Science &amp; Technology is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1021/es2036256
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      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 7
        StartPage: 1565
    Subjects:
      – SubjectFull: Uranium absorption & adsorption
        Type: general
      – SubjectFull: Migration of uranium
        Type: general
      – SubjectFull: Adsorption (Chemistry)
        Type: general
      – SubjectFull: Mathematical models
        Type: general
      – SubjectFull: Goethite
        Type: general
      – SubjectFull: Kaolinite
        Type: general
      – SubjectFull: Sediment analysis
        Type: general
      – SubjectFull: Savannah River Site (S.C.)
        Type: general
      – SubjectFull: South Carolina
        Type: general
    Titles:
      – TitleFull: Uranium(VI) Adsorption and Surface Complexation Modeling onto Background Sediments from the F-Area Savannah River Site.
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            NameFull: Dong, Wenming
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            NameFull: Tokunaga, Tetsu K.
      – PersonEntity:
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            NameFull: Davis, James A.
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            NameFull: Wan, Jiamin
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            – D: 07
              M: 02
              Text: 2/7/2012
              Type: published
              Y: 2012
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            – TitleFull: Environmental Science & Technology
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