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Soluble microbial products decrease pyrite oxidation by ferric iron at pH < 2.

Tesfayohanes Yacob1, Sachin Pandey, Joann Silverstein

  • 1Departments of Civil, Environmental, and Architectural Engineering, University of Colorado , 428 UCB, ECOT 441, Boulder, Colorado 80309, United States. yacob@colorado.edu

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Summary
This summary is machine-generated.

Soluble microbial products (SMP) from microbial activity in acid mine drainage (AMD) can significantly slow pyrite oxidation by complexing with ferric iron. This finding highlights the role of carbon cycling in AMD geochemistry.

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Area of Science:

  • Environmental Microbiology
  • Geochemistry
  • Biogeochemical Cycling

Background:

  • Acid mine drainage (AMD) research primarily focuses on iron and sulfur cycling.
  • Carbon cycling, specifically soluble microbial products (SMP), is a crucial but less-studied component of AMD.
  • SMP formation results from microbial cell growth and decay.

Purpose of the Study:

  • To investigate the interaction between SMP and soluble ferric iron under acidic conditions.
  • To determine if SMP complexation inhibits the oxidation of pyrite by ferric iron in AMD.

Main Methods:

  • Experiments were conducted using sterile suspensions at pH 1.8.
  • Pyrite oxidation rates were measured in the presence and absence of SMP.
  • SMP complexation effects were modeled computationally.

Main Results:

  • SMP reduced the rate of pyrite oxidation by ferric iron by 87% at a specific DOC to iron ratio.
  • The inhibitory effect of SMP on pyrite oxidation was comparable to, but weaker than, the synthetic siderophore DFAM.
  • Computational models supported the experimental findings of SMP complexation.

Conclusions:

  • Bacterially produced organic matter (SMP) plays a significant role in mitigating pyrite oxidation rates in AMD.
  • SMP complexation with ferric iron reduces its effectiveness as an oxidant, thereby slowing AMD generation.
  • Carbon cycling is an important factor influencing the geochemistry of acid mine drainage.