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Effect of microbial mediated iron plaque reduction on arsenic mobility in paddy soil

Xinjun Wang1, Xueping Chen, Jing Yang

  • 1State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. xinjunwang@126.com

Journal of Environmental Sciences (China)
|January 30, 2010
PubMed

Insights

Microbial iron reduction in arsenic-contaminated soils releases arsenic but also sequesters it in new iron minerals. Iron reducing bacteria and AQDS show potential for soil remediation.

Area of Science:

  • Environmental microbiology
  • Geochemistry
  • Soil science

Background:

  • Arsenic (As) contamination in paddy soils poses significant environmental and health risks.
  • Iron plaques in soils are major sinks for arsenic, influencing its mobility.
  • Microbial processes can alter iron plaque structure and arsenic bioavailability.

Purpose of the Study:

  • To investigate the impact of microbial iron plaque reduction on arsenic mobility.
  • To explore the potential of iron-reducing bacteria and AQDS for arsenic remediation in contaminated soils.

Main Methods:

  • Enrichment of iron-reducing bacteria from arsenic-contaminated paddy soil.
  • Incubation experiments using iron plaque and ferrihydrite as electron acceptors.
  • Quantification of Fe(II) and total arsenic concentrations.
  • Analysis of arsenic speciation (As(III) and As(V)).

Main Results:

  • Microbial iron reduction led to arsenic release from iron plaque.
  • A significant correlation was observed between Fe(II) and total arsenic concentrations.
  • Iron-reducing bacteria, especially with AQDS, inhibited the overall rate of arsenic increase.
  • Biotic treatments resulted in lower As(III) and As(V) concentrations compared to abiotic treatments at day 30.
  • Microbial iron reduction promoted the formation of more crystalline iron minerals, enhancing arsenic sequestration.

Conclusions:

  • Both microbial and chemical iron reduction release arsenic from iron plaque.
  • Microbial iron reduction promotes arsenic sequestration through the formation of crystalline iron minerals.
  • The combined use of iron-reducing bacteria and AQDS shows promise for remediating arsenic-contaminated soils by accelerating iron reduction, arsenic release, and subsequent arsenic retention.

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