AI Article Synopsis
- The study investigates how different redox potentials affect the behavior of pollutants 6-OH-BDE-47 and 6-MeO-BDE-47, particularly their transformation and microbial interactions in water-sediment systems.
- It was found that aerobic microorganisms and specific electron acceptors, like nitrate, significantly influence the formation of nonextractable residues (NERs) for both compounds, with differing levels of degradation observed under varying conditions.
- The research highlights the complexity of microbial communities under different redox conditions, suggesting that the choice of electron acceptors is crucial for effective remediation strategies for these pollutants.
Article Abstract
Pollutants often exhibit different environmental behaviors at varying redox potentials, and the fate and microbial response of 6-OH-BDE-47 and 6-MeO-BDE-47 under these conditions remain unclear. Herein, C-labeled 6-OH-BDE-47 and 6-MeO-BDE-47 were used to investigate their fate in water-sediment systems at different redox potentials. For 6-OH-BDE-47, aerobic microorganisms and nitrate electron acceptors promoted nonextractable residues (NERs) formation and anaerobic microorganisms facilitated their release and was highest formed in the O-containing group. For 6-MeO-BDE-47, aerobic microorganisms, electron acceptors, and anaerobic microorganisms promoted NER formation, and was highest formed in the nitrate group. Microorganisms markedly promoted 6-OH/MeO-BDE-47 transformation. For 6-OH-BDE-47, the degradation followed the order nitrate group (29.6 %) > O-containing group (6.5 %) > sulfate group (1.45 %) > anaerobic group (0 %), while for 6-MeO-BDE-47, the order was O-containing group (8.8 %) > nitrate group = sulfate group = anaerobic group (0 %). The complexity of the 6-OH-BDE-47 and 6-MeO-BDE-47 microbial community network was consistent with the results of redox potentials, where microbial networks connectivity linking were more complex under O-containing and nitrate conditions. Overall, our study comprehensively revealed the fate of 6-OH-BDE-47 and 6-MeO-BDE-47 under different redox conditions, showing that electron acceptors can alter microbial community structure and regulating interactions. It provided guidelines for selecting electron acceptors in the remediation of 6-OH-BDE-47 and 6-MeO-BDE-47.
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| http://dx.doi.org/10.1016/j.jhazmat.2024.136663 | DOI Listing |
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