Cristin-resultat-ID: 1578887
Sist endret: 10. juli 2018, 15:05
NVI-rapporteringsår: 2018
Resultat
Vitenskapelig artikkel
2018

Biodegradation of oil spill dispersant surfactants in cold seawater

Bidragsytere:
  • Odd Gunnar Brakstad
  • Trond Røvik Størseth
  • Anders Brunsvik
  • Kristin Bonaunet og
  • Liv Guri Faksness

Tidsskrift

Chemosphere
ISSN 0045-6535
e-ISSN 1879-1298
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2018
Publisert online: 2018
Trykket: 2018
Volum: 204
Sider: 290 - 293
Open Access

Importkilder

Scopus-ID: 2-s2.0-85047413556

Beskrivelse Beskrivelse

Tittel

Biodegradation of oil spill dispersant surfactants in cold seawater

Sammendrag

While 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

Bidragsytere

Odd Gunnar Brakstad

  • Tilknyttet:
    Forfatter
    ved Klima og miljø ved SINTEF Ocean

Trond Røvik Størseth

  • Tilknyttet:
    Forfatter
    ved Klima og miljø ved SINTEF Ocean

Anders Brunsvik

  • Tilknyttet:
    Forfatter
    ved Bioteknologi og nanomedisin ved SINTEF AS

Kristin Bonaunet

  • Tilknyttet:
    Forfatter
    ved Klima og miljø ved SINTEF Ocean

Liv-Guri Faksness

Bidragsyterens navn vises på dette resultatet som Liv Guri Faksness
  • Tilknyttet:
    Forfatter
    ved Klima og miljø ved SINTEF Ocean
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