PBDEs IN WATER AND AQUATIC BIOTA OF THE PEARL RIVER ESTUARY,SOUTH CHINA

摘要

Water and aquatic organisms from the Pearl River Estuary have been sampled and analyzed for a suite of ten polybrominated diphenyl ether (PBDEs) congeners. The dissolved PBDE concentrations ranged from 2.5-128 pg/L. The dissolved PBDE concentrations in dry season were significantly higher than those in flood reason. The concentrations of PBDEs in organisms varied from 6.2 to 208 ng/g lipid weight. A slight decreasing trend of PBDE concentrations was observed in biota samples from 2005 to 2007. Log BAF (bioaccumulation factor) for PBDEs ranged from 2.4-5.6. A regression of the log BAF and log KOW (the octanol-water partition coefficient) indicated a parabolic relationship for PBDEs. BDE99 does not appear to follow the same trend, which can be largely attributed to metabolism of BDE99 in organisms sampled.