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dc.contributor.authorBrakstad, Odd Gunnar
dc.contributor.authorStørseth, Trond Røvik
dc.contributor.authorBrunsvik, Anders
dc.contributor.authorBonaunet, Kristin
dc.contributor.authorFaksness, Liv Guri
dc.date.accessioned2018-05-16T07:17:50Z
dc.date.available2018-05-16T07:17:50Z
dc.date.created2018-04-11T23:29:20Z
dc.date.issued2018
dc.identifier.citationChemosphere. 2018, 204 290-293.nb_NO
dc.identifier.issn0045-6535
dc.identifier.urihttp://hdl.handle.net/11250/2498268
dc.description.abstractWhile biodegradation of chemically dispersed oil has been well documented, only a few studies have focused on the degradation of the dispersant compounds themselves. The objective of this study was to determine the biodegradation of dispersant surfactants in cold seawater, relevant for deep sea or Arctic conditions. Biotransformation of the surfactants dioctyl-sodium sulfosuccinate (DOSS), Tween 80, Tween 85, and α/β-ethylhexylsulfosuccinate (EHSS, expected DOSS hydrolysis product) in the commercial dispersants Corexit 9500, Dasic Slickgone NS and Finasol OSR52 were determined. The biotransformation studies of the surfactants were performed in natural seawater at 5 °C over a period of 54 days without oil present. The surfactants were tested at concentrations of 1, 5, and 50 mg/L, the lower concentration being as close as possible to expected field concentrations. Experiments with dispersants concentrations of 1 mg/L resulted in rapid biotransformation of Tween 80 and Tween 85, with depletion after 8 days, while DOSS showed rapid biotransformation after a lag period of 16 days. The degradation half-life of DOSS increased from 4.1 days to >500 days as Corexit 9500 concentrations went from 1 mg/L to 50 mg/L, emphasizing the importance of performing experiments at dispersant concentrations as close as possible to environmentally relevant concentrations. EHSS showed limited degradation compared to other surfactants. This study shows that the surfactants DOSS, Tween 80 and Tween 85 in the three chemical dispersants studied are biodegradable in cold seawater, particularly in environmentally relevant concentrations.nb_NO
dc.language.isoengnb_NO
dc.publisherElseviernb_NO
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/deed.no*
dc.titleBiodegradation of oil spill dispersant surfactants in cold seawaternb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber290-293nb_NO
dc.source.volume204nb_NO
dc.source.journalChemospherenb_NO
dc.identifier.doi10.1016/j.chemosphere.2018.04.051
dc.identifier.cristin1578887
dc.description.localcode© 2018. This is the authors’ accepted and refereed manuscript to the article. Locked until 11.4.2020 due to copyright restrictions. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/nb_NO
cristin.unitcode194,66,10,0
cristin.unitnameInstitutt for biologi
cristin.ispublishedfalse
cristin.fulltextpostprint
cristin.qualitycode1


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Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal
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