Anaerobic biotransformation of tetrabromobisphenol A, tetrachlorobisphenol A, and bisphenol A in estuarine sediments.

摘要: Biotransformation of the flame retardants tetrabromobisphenol A and tetrachlorobisphenol A, their ultimate biodehalogenation product, bisphenol was examined in anoxic estuarine sediments. Dehalogenation under conditions promoting either methanogenesis or sulfate reduction as primary terminal electron-accepting process. Complete dehalogenation to with no further degradation observed both methanogenic sulfate-reducing conditions. resulted accumulation a persistent dichlorinated isomer, while formed. Co-amendment sediment enrichments 2,6-dibromo- 2,6-dichlorophenol did not affect extent compared sediments that were amended only retardants. Sediment cultures pre-acclimated on 2-bromophenol dehalogenated manner similar fresh No loss separate incubations within 162 days methanogenesis, sulfate-reduction, iron(III)-reduction, nitrate-reduction. Furthermore, identical readily degraded 4-hydroxybenzoate, structural analogue exhibit degradation. The tetrabromo- potential for is significant given widespread use these chemicals.