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Uranium Speciation in a Chalky Soil.

Simon Bayle1,2,3, Maria Rosa Beccia1, Christophe Moulin3,4

  • 1Université Côte d'Azur, CNRS, ICN, 06108 Nice, France.

Environmental Science & Technology
|July 7, 2023
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Summary

Anthropogenic uranium in soil is limited by sorption to minerals and organic matter. Two uranyl complexes form on carbonates, and uranium binds to humic substances, potentially increasing migration.

Keywords:
X-ray absorption spectroscopycarbonatesmigrationspeciationuranium

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Analytical Chemistry

Background:

  • Anthropogenic uranium contamination in natural soil poses environmental risks.
  • Understanding uranium speciation and behavior is crucial for risk assessment and remediation.

Purpose of the Study:

  • To investigate the speciation and behavior of anthropogenic uranium in soil and bedrock.
  • To determine the factors limiting uranium migration and identify uranium complexation mechanisms.

Main Methods:

  • Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy.
  • Time-Resolved Laser-Induced Fluorescence Spectroscopy (TRLFS).
  • Sorption isotherm studies on calcite, chalk, and chalky soil.

Main Results:

  • Uranium migration is primarily limited by sorption to mineral carbonates and organic matter in soil and bedrock.
  • Two distinct uranyl adsorption complexes were identified on carbonate materials: a tricarbonate complex at low uranyl loads and incorporation into calcite at higher loads.
  • Uranium forms complexes with humic substances, involving monodentate and bidentate carboxylate/carbonate functions, which could enhance colloidal migration.

Conclusions:

  • Sorption onto soil and rock constituents significantly restricts uranium mobility.
  • The speciation of uranyl on carbonate surfaces is dependent on concentration, forming distinct complexes.
  • Uranium-humic substance interactions are significant and may represent a pathway for enhanced uranium transport in subsurface environments.