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Changes in soil microbial community composition induced by cometabolism of toluene and trichloroethylene.

Authors
  • Hubert, Casey
  • Shen, Yin
  • Voordouw, Gerrit
Type
Published Article
Journal
Biodegradation
Publication Date
Feb 01, 2005
Volume
16
Issue
1
Pages
11–22
Identifiers
PMID: 15727151
Source
Medline
License
Unknown

Abstract

The effects of trichloroethylene (TCE) on microbial community composition were analyzed by reverse sample genome probing. Soil enrichments were incubated in dessicators containing an organic phase of either 1 or 10% (w/w) toluene in vacuum pump oil, delivering constant equilibrium aqueous concentrations of 16 and 143 mg/l, respectively. Increasing the equilibrium aqueous concentration of TCE from 0 to 10 mg/l led to shifts in community composition at 16, but not at 143 mg/l of toluene. In closed system co-degradation studies, TCE at an aqueous concentration of 1 mg/l was effectively degraded by toluene-degrading soil enrichments once the aqueous toluene concentration dropped below 25 mg/l. Little TCE degradation was observed at higher toluene concentrations (50-250 mg/l). The results indicate that TCE changes microbial community composition under conditions where it is being actively metabolized.

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