title: Anaerobic biodegradation of DDT residues (DDT, DDD, and DDE) in estuarine sediment.
abstract: The potential for anaerobic biodegradation of 1,1,1-trichloro-2,2-bischlorophenylethane (DDT), 1,1-dichloro-2,2,-bischlorophenylethane (DDD), and dichlorodiphenylchloroethylene (DDE) in anoxic sediment slurries collected from the Keelung River was investigated in this study. o,p'- and p,p'-DDT were dechlorinated to o,p'- and p,p'-DDD, respectively, and then transformed to other compound(s). 1-Chloro-2,2-bis (p-chlorophenyl) ethylene (DDMU) and trace amount of dichlorobenzophenone (DBP) were detected in sediment slurries amended with p,p'-DDT or p,p'-DDD. DDMU was also detected in sediment slurries amended with p,p'-DDE. The relative transformation rates for both o,p'- and p,p'-isomers of DDT, DDD, and DDE were DDT>DDD>DDE. Re-addition of DDT, DDD, or DDE to the sediment slurries after initial removal enhanced the respective dechlorination rates. The transformation rates of the p,p'-isomers of both DDT and DDD were faster than those of the respective o,p'-isomers. p,p'-DDT dechlorination in the p,p'-DDT-adapted sediment slurries were inhibited by the addition of molybdate, or molybdate plus sulfate, but not inhibited by the addition of sulfate. Addition of bromoethane-sulfonic acid (BESA) slightly inhibited p,p'-DDT dechlorination. Non-adapted sediment slurries lost the ability to dechlorinate pentachlorophenol during adaptation to p,p'-DDT. p,p'-DDD was the major transformation product of p, p'-DDT in 3,4,4',5-tetrachlorobiphenyl-adapted sediment slurries, which suggested that the microbial community in the 3,4,4',5-CB-adapted sediment was unable to remove chlorine from the aromatic rings of p,p'-DDT.
authors: National Institute of Environmental Analysis, Environmental Protection Administration, Taiwan, ROC.
authors: H J
authors: HJ
authors: Huang
authors: S M
authors: SM
authors: Liu
authors: C E
authors: CE
authors: Kuo
mesh_terms: D017738:Alkanesulfonic Acids / Q000494:pharmacology; D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D002244:Carbon / Q000032:analysis; D003634:DDT / Q000031:analogs & derivatives / Q000378:metabolism*; D003633:Dichlorodiphenyl Dichloroethylene / Q000031:analogs & derivatives* / Q000378:metabolism*; D003632:Dichlorodiphenyldichloroethane / Q000031:analogs & derivatives / Q000378:metabolism*; D005618:Fresh Water / Q000032:analysis / Q000382:microbiology; D019015:Geologic Sediments; D006863:Hydrogen-Ion Concentration; D007306:Insecticides / Q000378:metabolism*; D008982:Molybdenum / Q000494:pharmacology; D009584:Nitrogen / Q000032:analysis; D010416:Pentachlorophenol / Q000378:metabolism; D010573:Pesticide Residues / Q000378:metabolism*; D012989:Soil Pollutants / Q000378:metabolism; D013431:Sulfates / Q000494:pharmacology; D013624:Taiwan; D014874:Water Pollutants, Chemical / Q000378:metabolism
chemical_list: D017738:Alkanesulfonic Acids; D007306:Insecticides; D010573:Pesticide Residues; D012989:Soil Pollutants; D013431:Sulfates; D014874:Water Pollutants, Chemical; C044659:molybdate; C018853:2-bromoethanesulfonic acid; D003633:Dichlorodiphenyl Dichloroethylene; D002244:Carbon; D008982:Molybdenum; D003634:DDT; D010416:Pentachlorophenol; D009584:Nitrogen; D003632:Dichlorodiphenyldichloroethane