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Main Title Reductive dechlorination of dichlorophenols in anaerobic pond sediments /
Author Hale, Dorothy Doyle, ; Rogers, J. E. ; Wiegel, J.
Other Authors
Author Title of a Work
Rogers, John E.
Wiegel, Juergen.
CORP Author Environmental Research Lab., Athens, GA. ;Technology Applications, Inc., Athens, GA. ;Georgia Univ., Athens. Dept. of Microbiology.
Publisher U.S. Environmental Protection Agency, Office of Research and Development, Environmental Research Laboratory,
Year Published 1990
Report Number EPA/600/D-90/151
Stock Number PB90-263922
Additional Subjects Anaerobic processes ; Sediments ; Dechlorination ; Ponds ; Aquatic microbiology ; Reduction(Chemistry) ; Biodeterioration ; pH ; Temperature ; Carbon ; Chlorine aromatic compounds
Library Call Number Additional Info Location Last
NTIS  PB90-263922 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 22 pages : illustrations ; 29 cm
The time required for the microbially mediated dechlorination of chloroaromatics in anaerobic freshwater sediments may be dependent upon sediment microbial communities and physical characteristics, as well as chlorine position in the aromatic ring. To better understand such possible relationships, the authors studied the reductive dechlorination of three dichlorophenol isomers in anaerobic sediments collected every other month for a year from five sites in one pond. Numbers of specific dechlorinating microorganisms were estimated by a most probable number technique, and sediment temperature, pH, E(sub h), and organic carbon content were determined. Levels of dissolved organic carbon, sulfate, and nitrate also were quantified in water samples collected with the anaerobic sediments. The relative susceptibility of the 2,4-, 2,5-, and 3,4- isomers to dechlorination was determined in sediment slurries. Dechlorination to monochlorophenols required from 2 to more than 32 weeks for completion, with the relative rates being 2,4->2,5->3,4-. The number of specific dechlorinating microbes appears to be important in determining the time required for this transformation.
Published paper. Includes bibliographical references. Microfiche.