Til hovedinnhold

Partitioning of PAHs between crude oil microdroplets, water, and copepod biomass in oil-in-seawater dispersions of different crude oils

Partitioning of PAHs between crude oil microdroplets, water, and copepod biomass in oil-in-seawater dispersions of different crude oils

Kategori
Tidsskriftspublikasjon
Sammendrag
The impact of oil microdroplets on the partitioning of polycyclic aromatic hydrocarbons (PAHs) between water and marine zooplankton was evaluated. The experimental approach allowed direct comparison of crude oil dispersions (containing both micro-oil droplets and water-soluble fraction; WSF) with the corresponding WSF (without oil droplets). Dispersion concentration and oil type have an impact on the PAH composition of WSFs and therefore affect dispersion bioavailability. Higher T-PAH body residues were observed in copepods treated with dispersions compared to the corresponding WSFs. PAHs with log Kow 3–4.5 displayed comparable accumulation factors between treatments; however, accumulation factors for less soluble PAHs (log Kow = 4.5–6) were higher for the WSF than for the dispersions, suggesting low bioavailability for components contained in oil droplets. The higher PAH body residue in dispersion exposures is assumed to result mainly from copepods grazing on oil droplets, which offers an alternative uptake route to passive diffusion. To a large degree this route is controlled by the filtration rates of the copepods, which may be inversely related to droplet concentration.
Språk
Engelsk
Forfatter(e)
Institusjon(er)
  • SINTEF Ocean / Miljø og nye ressurser
  • Norges teknisk-naturvitenskapelige universitet
  • Diverse norske bedrifter og organisasjoner
  • Florida International University
År
2018
Publisert i
Environmental Science and Technology
ISSN
0013-936X
Forlag
ACS Publications
Årgang
52
Hefte nr.
24
Side(r)
14436 - 14444