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Updated: Feb 19, 2026

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Interactions between magnetite and humic substances: redox reactions and dissolution processes.

Anneli Sundman1, James M Byrne2, Iris Bauer2

  • 1Geomicrobiology, Center for Applied Geosciences, University of Tuebingen, Sigwartstrasse 10, 72076, Tuebingen, Germany. sundman.anneli@gmail.com.

Geochemical Transactions
|November 1, 2017
PubMed
Summary

Humic substances (HS) interact with magnetite, influencing its iron (Fe) speciation and reactivity. These redox reactions can cause magnetite dissolution or oxidation, impacting biogeochemical iron cycling.

Keywords:
DissolutionElectron transferHumic substancesMagnetiteRedox

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Area of Science:

  • Environmental Chemistry
  • Geochemistry
  • Microbiology

Background:

  • Humic substances (HS) are redox-active environmental compounds.
  • HS act as electron shuttles in microbial Fe(III) reduction.
  • Reactions between HS and magnetite (Fe3O4) are poorly understood.

Purpose of the Study:

  • Investigate redox reactions between HS and magnetite.
  • Determine how HS affect magnetite's Fe(II)/Fe(III) stoichiometry and dissolution.
  • Understand the role of HS in iron biogeochemical cycling.

Main Methods:

  • Incubation of native and reduced HS with four magnetite types.
  • Varied magnetite particle size and Fe(II)/Fe(III) stoichiometry.
  • Quantified dissolved and solid-phase Fe(II) and Fe(III) over time.

Main Results:

  • Magnetite reactions and dissolution varied with HS and magnetite properties.
  • Reduced HS interacted with biogenic magnetite, causing dissolution and reduction.
  • Native and reduced HS with 500 nm magnetite showed slight oxidation, no dissolution.

Conclusions:

  • Magnetite solubility and reactivity depend on its reduction potential, influenced by stoichiometry, size, and crystallinity.
  • Redox-active HS significantly impact Fe redox speciation in minerals like magnetite.
  • These HS-magnetite interactions affect Fe mineral reactivity and biogeochemical Fe cycling.