Biodegradation of water-accommodated aromatic oil compounds in Arctic seawater at 0 °C
Autor: | Leendert Vergeynst, Søren Rysgaard, Jan H. Christensen, Ana Gomes, Friederike Gründger, Kasper Urup Kjeldsen |
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Jazyk: | angličtina |
Rok vydání: | 2022 |
Předmět: |
Environmental Engineering
Health Toxicology and Mutagenesis Greenland Oil pollution chemistry.chemical_compound RNA Ribosomal 16S Marine ecosystem Environmental Chemistry Petroleum Pollution Seawater Oil-degrading bacteria Ecosystem Aromatic hydrocarbon biology Water-accommodated fraction Arctic Regions Public Health Environmental and Occupational Health Acenaphthene Water General Medicine General Chemistry Cycloclasticus Phenanthrene Biodegradation biology.organism_classification Pollution Acenaphthylene Hydrocarbons Biodegradation Environmental Petroleum chemistry Environmental chemistry Microcosm Gammaproteobacteria Water Pollutants Chemical |
Zdroj: | Gomes, A M R, Christensen, J H, Gründger, F, Kjeldsen, K U, Rysgaard, S & Vergeynst, L 2022, ' Biodegradation of water-accommodated aromatic oil compounds in Arctic seawater at 0 °C ', Chemosphere, vol. 286, no. Part 3, 131751 . https://doi.org/10.1016/j.chemosphere.2021.131751 Gomes, A, Christensen, J H, Gründger, F, Kjeldsen, K U, Rysgaard, S & Vergeynst, L 2022, ' Biodegradation of water-accommodated aromatic oil compounds in Arctic seawater at 0 °C ', Chemosphere, vol. 286, 131751 . https://doi.org/10.1016/j.chemosphere.2021.131751 |
Popis: | Oil spills in Arctic marine environments are expected to increase concurrently with the expansion of shipping routes and petroleum exploitation into previously inaccessible ice-dominated regions. Most research on oil biodegradation focusses on the bulk oil, but the fate of the water-accommodated fraction (WAF), mainly composed of toxic aromatic compounds, is largely underexplored. To evaluate the bacterial degradation capacity of such dissolved aromatics in Greenlandic seawater, microcosms consisting of 0 °C seawater polluted with WAF were investigated over a 3-month period. With a half-life (t1/2) of 26 days, m-xylene was the fastest degraded compound, as measured by gas chromatography - mass spectrometry. Substantial slower degradation was observed for ethylbenzene, naphthalenes, phenanthrene, acenaphthylene, acenaphthene and fluorenes with t1/2 of 40–105 days. Colwellia, identified by 16S rRNA gene sequencing, was the main potential degrader of m-xylene. This genus occupied up to 47 % of the bacterial community until day 10 in the microcosms. Cycloclasticus and Zhongshania aliphaticivorans, potentially utilizing one-to three-ringed aromatics, replaced Colwellia between day 10 and 96 and occupied up to 6 % and 23 % of the community, respectively. Although most of the WAF can ultimately be eliminated in microcosms, our results suggest that the restoration of an oil-impacted Arctic environment may be slow as most analysed compounds had t1/2 of over 2–3 months and the detrimental effects of a spill towards the marine ecosystem likely persist during this time. |
Databáze: | OpenAIRE |
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