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Related Experiment Videos

Plutonium solubility in sediment pore waters.

K Morris1, N D Bryan, F R Livens

  • 1School of the Environment, University of Leeds, Leeds, LS2 9JT, UK. kath@env.leeds.ac.uk

Journal of Environmental Radioactivity
|July 27, 2001
PubMed
Summary
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Dissolved plutonium concentrations in River Esk pore waters varied seasonally in saltmarshes but remained stable in reedbeds. Plutonium mobility is influenced by sediment type and complexation with organic matter.

Area of Science:

  • Environmental Science
  • Radiochemistry
  • Geochemistry

Background:

  • Plutonium (Pu) contamination in aquatic environments requires understanding its speciation and mobility.
  • Pore water chemistry significantly influences radionuclide behavior in sediments.

Purpose of the Study:

  • To quantify dissolved plutonium concentrations in pore waters of contrasting River Esk sites.
  • To investigate seasonal variations and controlling factors of dissolved Pu.

Main Methods:

  • In situ porous cup samplers were used for year-long pore water collection.
  • Dissolved plutonium, iron, manganese, sodium, and dissolved organic carbon (DOC) were measured.

Main Results:

  • Saltmarsh sediments showed low dissolved Pu (1.1-3.5 mBq l-1), with seasonal variations linked to Fe and Mn.

Related Experiment Videos

  • Reedbed sediments exhibited higher dissolved Pu (9.0-28.5 mBq l-1), with concentrations stable and linked to organic matter complexation.
  • Dissolved Pu was proportionally higher in organic-rich, reducing reedbed sediments (10^-3) compared to saltmarsh (10^-6).

    • Conclusions:

    • Sediment type and organic matter complexation are key factors controlling dissolved Pu.
    • Seasonal redox changes may influence Pu in saltmarshes, but this requires further investigation.
    • Reedbed environments maintain higher dissolved Pu concentrations due to complexation with dissolved organic matter.