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Related Experiment Videos

Selenate reduction by bacteria from a selenium-rich environment.

D T Maiers1, P L Wichlacz, D L Thompson

  • 1Idaho National Engineering Laboratory, Idaho Falls 83415-2203.

Applied and Environmental Microbiology
|October 1, 1988
PubMed
Summary

Indigenous bacteria in Kesterson Reservoir can reduce selenate, a selenium compound. These microbes efficiently transform selenate into insoluble precipitates, playing a key role in selenium biogeochemical cycling.

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Area of Science:

  • Environmental Science
  • Microbiology
  • Geochemistry

Background:

  • Kesterson Reservoir is a known selenium contamination site.
  • Understanding microbial roles in selenium cycling is crucial for remediation.

Purpose of the Study:

  • To investigate the presence and capability of indigenous bacteria to reduce selenate in Kesterson Reservoir samples.
  • To assess the efficiency and products of microbial selenate reduction.

Main Methods:

  • Collected water, sediment, and soil samples from Kesterson Reservoir.
  • Screened samples for bacterial presence and selenate reduction.
  • Incubated selenate with microbial populations and analyzed reduction products.

Main Results:

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  • Indigenous bacteria were capable of reducing selenate at concentrations up to 100 mg/L.
  • Selenate reduction was most prevalent in sediment (92%) and soil (100%) samples.
  • Microbial reduction was rapid, completing within 1 week, and produced insoluble red precipitates.

Conclusions:

  • Indigenous bacteria in Kesterson Reservoir possess significant selenate-reducing capabilities.
  • These microbial processes are vital for the biogeochemical cycling of selenium in contaminated environments.
  • Bacterial selenate reduction contributes to selenium immobilization and transformation.