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Title: Biodegradation of Biphenyl and Coplanar Polychlorianted Biphenyl Congeners by Anaerobic Microorganisms from Estuarine Sediments
Authors: Cham-en Kuo
Shiu-Mei Liu
Chiareiy Liu
Contributors: 國立臺灣海洋大學:海洋生物研究所
Keywords: anoxic estuarine sediments
non-planar congeners
coplanar congeners
Tween 20
Date: 1999
Issue Date: 2018-05-02T03:42:11Z
Publisher: Chemosphere
Abstract: Abstract: In this study, we investigated the biodegradability of biphenyl and 5 congeners (one non-planar and four coplanar) of polychlorinated biphenyl (PCB). Biphenyl, the non-planar congener 2,3′,4′,5-tetrachlorobiphenyl (25–34 CB), and the four coplanar congeners 3,3′,4,4′-tetrachlorobiphenyl (34-34 CB), 3,4,4′,5-tetrachlorobiphenyl (345-4 CB), 3,3′,4,4′,5-pentachlorobiphenyl (345-34 CB), and 3,3′,4,4′,5,5′-hexachlorobiphenyl (345–345 CB) were amended at a concentration of 10 mg/L into anoxic sediment slurries collected from the estuaries of the Tansui River and the Eden River. During 2 years' incubation under sulfidogenic conditions, biphenyl was persistent, while all other chlorinated congeners, except for 345–345 CB, were dechlorinated with or without a lag period in sediment slurries collected from both rivers. Dechlorination of coplanar and non-planar congeners began with para chlorine removal. All para chlorines from the mono-, di-, and trichlorobiphenyl groups could be removed by sediment slurries from both rivers. Microbial communities in sediment from the Eden River additionally fostered meta-dechlorination activity, but only after removal of all the para chlorines. Addition of Tween 20 (0.05%, v/v) into sediment slurries from the Tansui River did not enhance dechlorination rates or extents, but the addition of toluene- or 3-chlorobenzoate-adapted sediments enhanced dechlorination of 34-34 CB and 345-4 CB.
Relation: 39(9) pp.1445-1458
Appears in Collections:[Institute of Marine Biology] Periodical Articles

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