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Reductive dechlorination of a polychlorinated biphenyl congener and hexachlorobenzene by vitamin B12
N Assaf-Anid1, L Nies, T M Vogel
1Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor 48109-2125.
Applied and Environmental Microbiology
|March 1, 1992
Abstract:
The polychlorinated biphenyl congener 2,3,4,5,6-pentachlorobiphenyl and hexachlorobenzene were reductively dechlorinated in an aqueous biomimetic model system containing vitamin B12. The products of 2,3,4,5,6-pentachlorobiphenyl dechlorination were 2,3,5,6- and 2,3,4,6-tetrachlorobiphenyl. Hexachlorobenzene dechlorinated to pentachlorobenzene and a mixture of 1,2,4,5- and 1,2,3,5-tetrachlorobenzene. The proton from water was shown to be the source of the hydrogen atom used for the replacement of chlorine on the biphenyl ring.