Microbial degradation of toluene under sulfate-reducing conditions and the influence of iron on the process
Article Abstract:
The degradation of toluene was demonstrated using fuel-contaminated subsurface soil and toluene-enriched cultures of these microcosms as inocula. Relative reaction rates and stoichiometric evidence suggested that toluene degradation was directly coupledto sulfate reduction. Furthermore, the addition of millimolar amounts of amorphous ferric hydroxide was important in initiating or accelerating toluene degradation. However, stoichiometric data suggests that ferric iron reduction is not directly coupled to toluene degradation. Instead, ferric iron may react with biogenic hydrogen sulfide.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1992
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Metabolic by-products of anaerobic toluene degradation by sulfate-reducing enrichment cultures
Article Abstract:
A sulfate-reducing enrichment culture, derived from an aviation fuel-contaminated subsurface soil sample, was provided with toluene as its sole carbon source. End product analysis showed that the microbial consortium produced benzylsuccinate and benzylfumarate as dead-end metabolites of toluene degradation. These metabolites constituted 10% of toluene carbon, with 80% being mineralized to carbon dioxide. The results demonstrate that a consortium of anaerobic bacteria are capable of producing dead-end metabolites which have been associated only with a denitrifying pure culture.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1992
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Anaerobic degradation of toluene and xylene by aquifer microorgansisms undersulfate-reducing conditions
Article Abstract:
The complete mineralization of toluene and xylenes by naturally-occuring microflora from gasoline-contaminated sandy silt was demonstrated. Conclusive evidence showed that toluene and xylene degradation occured with sulfate as the terminal electron donor. Complete mineralization of toluene and xylene was confirmed by using radiolabelled carbon as substrate. The results also showed that very little of the labelled carbon was assimilated into biomass, and was mostly liberated as carbon dioxide.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1992
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