TY - JOUR
T1 - Microcosm study on fate of polybrominated diphenyl ethers (PBDEs) in contaminated mangrove sediment
AU - Zhu, Haowen
AU - Wang, Ying
AU - Tam, Nora F.Y.
N1 - Funding Information:
The present study was financially supported by the State Key Laboratory in Marine Pollution, City University of Hong Kong .
PY - 2014/1/30
Y1 - 2014/1/30
N2 - Polybrominated diphenyl ethers (PBDEs) are toxic and ubiquitous environmental contaminants, but their fate in aquatic environments is not clear. A mangrove microcosm study was employed to investigate the fate of two abundant congeners, BDE-47 and BDE-209, in contaminated sediment. After seven months, more than 90% of the spiked BDE-47 in the mangrove sediment was removed with the formation of lower brominated PBDEs, including BDE-28, -17, -15, -8, -7/4, suggesting that microbial debromination was the main contributor. Debromination of BDE-209 was also observed in the sediment but its dissipation rate was significantly lower than BDE-47. All these congeners were taken up, translocated and accumulated into the tissues of two typical mangrove plants, Kandelia obovata and Avicennia marina. PBDEs, even at very high contamination levels, in the sediment (5000ngg-1) and the debrominated congeners did not pose any adverse effect on the dry weight, augmentation and root/shoot ratio of either mangrove species. This is the first study to reveal that anaerobic microbial debromination and uptake by mangrove plants are the key processes controlling the fate of PBDEs in mangrove sediment.
AB - Polybrominated diphenyl ethers (PBDEs) are toxic and ubiquitous environmental contaminants, but their fate in aquatic environments is not clear. A mangrove microcosm study was employed to investigate the fate of two abundant congeners, BDE-47 and BDE-209, in contaminated sediment. After seven months, more than 90% of the spiked BDE-47 in the mangrove sediment was removed with the formation of lower brominated PBDEs, including BDE-28, -17, -15, -8, -7/4, suggesting that microbial debromination was the main contributor. Debromination of BDE-209 was also observed in the sediment but its dissipation rate was significantly lower than BDE-47. All these congeners were taken up, translocated and accumulated into the tissues of two typical mangrove plants, Kandelia obovata and Avicennia marina. PBDEs, even at very high contamination levels, in the sediment (5000ngg-1) and the debrominated congeners did not pose any adverse effect on the dry weight, augmentation and root/shoot ratio of either mangrove species. This is the first study to reveal that anaerobic microbial debromination and uptake by mangrove plants are the key processes controlling the fate of PBDEs in mangrove sediment.
KW - Contamination
KW - Debromination
KW - Mangroves
KW - PBDE congeners
KW - Plant uptake
UR - http://www.scopus.com/inward/record.url?scp=84890016256&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2013.11.046
DO - 10.1016/j.jhazmat.2013.11.046
M3 - Article
C2 - 24333715
AN - SCOPUS:84890016256
SN - 0304-3894
VL - 265
SP - 61
EP - 68
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -