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Anaerobic reductive dechlorination of chlorinated dioxins in estuarine sediments



The biotransformation of 1,2,3,4-tetrachlorodibenzo- p -dioxin (1,2,3,4-tetraCDD) under anaerobic sulfate-reducing, methanogenic, and iron-reducing conditions was examined with anaerobic enrichment cultures established with sediment from an estuarine intertidal strait in the New York/New Jersey harbor. In addition, the effect of prior enrichment on 2-bromophenol or a mixture of 2-, 3-, and 4-bromophenol on dioxin dechlorination was examined. All enrichments were spiked with 1 ppm 1,2,3,4-tetraCDD and monitored by gas chromatography-mass spectrometry for up to a 3-year period. Reductive dechlorination was initially observed only under methanogenic conditions in the cultures enriched on all three bromophenol isomers. 1,2,3,4-TetraCDD was dechlorinated in the lateral position to 1,2,4-triCDD. The initial appearance of 1,2,4-triCDD was observed after 2 months, with further dechlorination to 1,3-diCDD within 17 months.



Applied Microbiology and BiotechnologySpringer Journals

Published: Dec 1, 2001

DOI: 10.1007/s00253-001-0830-6

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