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Oxidative Uranium Release from Anoxic Sediments under Diffusion-Limited Conditions.

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Uranium contamination in aquifers is often immobilized by organic-rich sediments. Even with oxygen and nitrate influxes, uranium mobilization is limited due to abundant organic carbon fueling microbial respiration.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Microbiology

Background:

  • Uranium (U) contamination is a concern from mining and ore processing.
  • Tetravalent uranium (U(IV)) accumulates in reduced, organic-rich aquifer sediments.
  • U(IV) can mobilize when exposed to oxidants like nitrate (NO3-) and oxygen (O2) from water table fluctuations.

Purpose of the Study:

  • To investigate uranium release from reduced sediments exposed to oxidants under diffusion-limited conditions.
  • To understand the factors controlling uranium mobilization in contaminated alluvial aquifers.

Main Methods:

  • Exposure of reduced sediments to artificial groundwater containing O2 or NO3-.
  • Monitoring U mobilization over an 85-day reaction period.
  • Analysis of sediment properties, including ferrous iron, sulfide, and organic carbon content.

Main Results:

  • Minimal uranium mobilization occurred despite rapid groundwater diffusion and presence of U(IV) species.
  • Rapid consumption of oxidants and production of ferrous iron and sulfide indicated high bioavailable organic carbon.
  • Bioavailable organic carbon fueled anaerobic respiration, stabilizing U(IV).

Conclusions:

  • Abundant organic carbon in sediments limits oxidative uranium mobilization.
  • Seasonal influxes of oxidants may cause only localized U release, not widespread export.
  • Sediment organic matter plays a crucial role in immobilizing uranium in contaminated aquifers.