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Goethite dissolution by acidophilic bacteria.

Srdjan Stanković1,2, Axel Schippers1

  • 1Federal Institute for Geosciences and Natural Resources (BGR), Hannover, Germany.

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|June 7, 2024
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Summary
This summary is machine-generated.

Acid-loving bacteria, including Acidithiobacillus species, were tested for their ability to dissolve goethite. Ferric iron reduction by these microbes showed minimal impact on goethite dissolution, especially for natural samples.

Keywords:
AcidiphiliumAcidithiobacillusferric iron reductiongoethiteiron(hydr)oxide

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Area of Science:

  • Geochemistry
  • Environmental Microbiology
  • Biotechnology

Background:

  • Acidophilic bacteria play a role in mineral dissolution, relevant to acid mine drainage and bioleaching.
  • Goethite dissolution is crucial for understanding iron cycling and resource recovery.

Purpose of the Study:

  • To investigate the role of ferric iron-reducing, acidophilic bacteria in goethite dissolution.
  • To compare the effects of microbial activity on natural and synthetic goethite.

Main Methods:

  • Laboratory batch culture incubation experiments were conducted under aerobic and anaerobic conditions.
  • Well-characterized natural and synthetic goethite samples were used.
  • Cultures included lithoautotrophic (Acidithiobacillus thiooxidans, At. ferrooxidans, At. caldus) and organoheterotrophic (Acidiphilium cryptum) acidophilic bacteria.

Main Results:

  • All tested bacteria remained viable and effectively reduced ferric iron in control assays.
  • Goethite dissolution was negligible with natural goethite samples.
  • Some dissolution was observed with synthetic goethite, consistent with prior research.
  • Microbial ferric iron reduction was found to enhance, but not initiate, goethite dissolution in highly acidic conditions.

Conclusions:

  • Ferric iron-reducing microbial activity at low pH is less significant for goethite dissolution than elemental sulfur oxidation.
  • Microbial ferric iron reduction alone does not initiate the dissolution of goethite in acidic environments.
  • The dissolution of natural goethite is not significantly influenced by the tested ferric iron-reducing acidophilic bacteria.