期刊
MARINE POLLUTION BULLETIN
卷 172, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2021.112823
关键词
Dispersed oil; Biotransformation; Bacterial dynamics; Brine; Dispersant; Hydrocarbon biodegradation; Oil pollution; Oil-degrading bacteria
资金
- PETROMAKS2 programme of the Norwegian Research Council
- AkerBP
- ConocoPhillips
- Equinor
- Lundin Norway
- Neptune Energy
- OMV
- Var Energi
Studies have shown that oil frozen in sea ice experiences negligible biodegradation before melting, but oil-degrading bacteria surviving in the ice may contribute to biodegradation when the ice melts.
Oil spilled in the Arctic may drift into ice-covered areas and become trapped until the ice melts. To determine if exposure to oil during freezing may have a priming effect on degradation of the oil, weathered dispersed oil (2-3 mg/L) was frozen into solid ice for 200 days at-10 degrees C, then melted and incubated for 64 days at 4 degrees C. No degradation was measured in oil frozen into ice prior to melting. Both total amount of oil and target compounds were biotransformed by the microbial community from the melted ice. However, oil released from melted ice was degraded at a slower rate than oil incubated in fresh seawater at the same temperature (4 degrees C), and by a different microbial community. These data suggest negligible biodegradation of oil frozen in sea ice, while oil-degrading bacteria surviving in the ice may contribute to biodegradation when the ice melts.
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