Dehalogenation of 2,6-dibromobiphenyl and 2,3,4,5,6-PENTACHLOROBIPHENYL (cas 18259-05-7) in contaminated estuarine sediment

Add time:08/01/2019    Source:sciencedirect.com

Estuarine sediments from a USEPA Superfund site in coastal Georgia were extensively contaminated with Aroclor 1268, a mixture of highly chlorinated polychlorinated biphenyls used by a former chlor-alkali plant. Batch slurries of contaminated sediment were incubated for 1 yr with amendments of 2,6-dibromobiphenyl (26-BB) and 2,3,4,5,6-PENTACHLOROBIPHENYL (cas 18259-05-7) (23456-CB) under anaerobic, sulfate-reducing conditions and different pH (5.5–7.5). Organic extracts of slurry sub-samples in a time series were analyzed by congener-specific GC–MS. Dechlorination of 23456-CB was pH dependent and occurred via two routes with the sequential loss of (1) meta and para chlorines and (2) para, ortho, and meta chlorines. Quantitative dehalogenation of 26-BB was observed at all pH. Supplementation of nonachlorobiphenyls (as primers) did not induce dechlorination of native Aroclor 1268 nor of the primers themselves. While contaminated estuarine sediments possess microbial consortia with diverse dehalogenating activities, lack of dechlorination of Aroclor 1268 and spiked nonachlorobiphenyl congeners suggests a bioavailability limitation or enzyme–substrate incompatibilies.

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