Chemical comparison and acute toxicity of water accommodated fraction (WAF) of source and field collected Macondo oils from the Deepwater Horizon spill

TitleChemical comparison and acute toxicity of water accommodated fraction (WAF) of source and field collected Macondo oils from the Deepwater Horizon spill
Publication TypeJournal Article
Year of Publication2015
AuthorsFaksness L-G, Altin D, Nordtug T, Daling PS, Hansen BHenrik
JournalMarine Pollution Bulletin
Volume91
Pagination222-229
Date PublishedFeb 15
ISBN Number0025-326X
Accession NumberWOS:000350079700041
KeywordsDeepwater Horizon Oil Spill
AbstractTwo Source oils and five field collected oil residues from the Deepwater Horizon incident were chemically characterized. Water accommodated fractions (WAFs) of the Source oils and two of the field-weathered oils were prepared to evaluate the impact of natural weathering on the chemical composition and the acute toxicity of the WAFs. Toxicity test species representing different tropic levels were used (the primary producer Skeletonema costatum (algae) and the herbivorous copepod Acartia tonsa). The results suggest that the potential for acute toxicity is higher in WAFs from non-weathered oils than WAFs from the field weathered oils. The Source oils contained a large fraction of soluble and bioavailable components (such as BTEX (benzene, toluene, ethyl benzene, xylenes) and naphthalene), whereas in the surface collected oils these components were depleted by dissolution into the water column as the oil rose to the surface and by evaporative loss after reaching the sea surface. (C) 2014 Elsevier Ltd. All rights reserved.
DOI10.1016/j.marpolbul.2014.12.002