期刊
ENVIRONMENTAL POLLUTION
卷 212, 期 -, 页码 290-298出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2016.01.063
关键词
PBDEs; Microalgae; Adsorption; Uptake; Metabolism
资金
- State Key Laboratory in Marine Pollution, City University of Hong Kong [9360136]
- City University of Hong Kong [7004206]
Polybrominated diphenyl ethers (PBDEs) are persistent and toxic organic pollutants, causing hazardous to ecosystems and human health but are difficult to remove from contaminated environments. The mechanism and kinetics of a Chlorella isolate to remove BDE-47 were investigated. This species isolated from the influent of wastewater treatment plants in Hong Kong was PBDE tolerant. More than 80% of BDE-47 was removed in short- and long-term experiments lasting 1 h and 7 days, respectively. The dominant removal process was adsorption on cell surfaces, with 73% of the spiked BDE-47 removed within five minutes of exposure. As the exposure prolonged, the adsorption became saturated. BDE-47 on cell surfaces was then gradually taken up into cells. At the end of the 7-day exposure, 17% of the spiked BDE-47 was within cells, while 27% was metabolized. Four metabolites, including BDE-28, 6-OH- and 5-OH-BDE-47, and 6-MeO-BDE-47, were produced from the debromination, hydroxylation and methoxylation of BDE-47. The removal kinetics of BDE-47 by freshwater microalgae could be explained by the multi-compartmental adsorption-uptake-metabolism model developed in this study. (C) 2016 Elsevier Ltd. All rights reserved.
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