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. 1990 Sep;56(9):2630–2637. doi: 10.1128/aem.56.9.2630-2637.1990

Effect of Sulfate and Organic Carbon Supplements on Reductive Dehalogenation of Chloroanilines in Anaerobic Aquifer Slurries

Elmar P Kuhn 1,†, G Todd Townsend 1,‡, Joseph M Suflita 1,*
PMCID: PMC184813  PMID: 16348273

Abstract

When di-, tri-, and tetrachloroaniline were incubated in methanogenic groundwater slurries, they were reductively dehalogenated by the aquifer microbiota. 2,3,4-Trichloroaniline was metabolized by two pathways. Primary dehalogenation occurred at either the meta or ortho position of this substrate to form 2,4- and 3,4-dichloroaniline, respectively. The latter chemical could be stoichiometrically converted to 3-chloroaniline. 2,3,4,5-Tetrachloroaniline was degraded by the sequential removal of halogens from the para and then the ortho position to form 3,5-dichloroaniline. An additional pathway was observed with this substrate when the aquifer slurries were amended with butyrate. That is, halogens could be removed from both the meta and ortho positions of tetrachloroaniline. The amendment of sulfate to methanogenic aquifer slurries slowed the rate of 2,3,4,5-tetrachloroaniline degradation and increased the amount of substrate channeled through the additional pathway. The reported intermediates or end products are identified by their chromatographic mobility and mass-spectral profiles.

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Selected References

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