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Related Experiment Videos

Arsenic mobility in contaminated lake sediments.

Nikolaos P Nikolaidis1, Gregory M Dobbs, Jing Chen

  • 1Department of Environmental Engineering, Technical University of Crete, Polytechnioupolis, 73100 Chania, Greece. nnikolai@mred.tuc.gr

Environmental Pollution (Barking, Essex : 1987)
|March 16, 2004
PubMed
Summary

Arsenic mobility in lake sediment is influenced by groundwater flow and sediment geochemistry. Iron co-precipitation significantly reduces arsenic leaching into water, leading to accumulation at the groundwater/lake interface.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Hydrogeology

Background:

  • Arsenic contamination in lake sediments near landfills poses environmental risks.
  • Understanding arsenic geochemistry and mobility is crucial for risk assessment.

Purpose of the Study:

  • To characterize arsenic geochemistry in contaminated lake sediment.
  • To assess the influence of environmental conditions on arsenic mobility.
  • To develop a kinetic model for arsenic leaching.

Main Methods:

  • Column experiments using contaminated lake sediment.
  • Application of the HM1D chemical transport model.
  • Development of a conceptual model for arsenic mobility.

Main Results:

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  • Arsenic leaching is dependent on groundwater flow and sediment geochemistry.
  • Significant amounts of arsenic were tightly bound to sediment particles.
  • Iron/arsenic co-precipitation substantially reduced arsenic leaching into the water column.

Conclusions:

  • Arsenic accumulates at the groundwater/lake interface.
  • Formation of insoluble precipitates limits arsenic mobility.
  • Environmental conditions play a key role in arsenic immobilization.