Direct inhibition of methanogenesis by ferric iron

P.M. van Bodegom, J.C.M. Scholten, A.J.M. Stams

Research output: Contribution to journalArticleAcademicpeer-review

118 Citations (Scopus)

Abstract

Observed inhibition of methanogenesis under Fe(III)-reducing conditions is usually explained by competition of methanogens and Fe(III)-reducing bacteria for the common Substrates acetate and hydrogen. However, substrate competition alone cannot explain the strong inhibition of methanogenesis during Fe(III)-reduction. We demonstrate direct inhibition of methanogenesis by amorphous Fe(OH)(3) at concentrations between 0 and 10 mM in experiments with pure cultures of inethanogens. The sensitivity toward Fe(III) was higher for Methanospirillum hungatei and Methanosarcina barkeri grown with H-2/CO2 than for Methanosaeta concilii and Methanosarcina barkeri grown with acetate. Cultures of Methanosarcina barkeri grown with H-2/CO2 and methanol demonstrated a capacity for Fe(III) reduction, which suggests that Fe(III)-reduction by methanogens may also contribute to Fe(III) inhibition of methanogenesis. Our results have important implications for kinetic modelling of microbial redox processes in anoxic soils and sediments. (C) 2004 Published by Elsevier B.V. on behalf of the Federation of European Microbiological Societies.
Original languageEnglish
Pages (from-to)261-268
JournalFEMS microbiology ecology
Volume49
Issue number2
DOIs
Publication statusPublished - 2004

Keywords

  • fe(iii) oxide reduction
  • rice paddy soils
  • methane production
  • microbial processes
  • sulfate reduction
  • field soil
  • bacteria
  • sediments
  • mineralization
  • microorganisms

Fingerprint Dive into the research topics of 'Direct inhibition of methanogenesis by ferric iron'. Together they form a unique fingerprint.

  • Cite this