Water accommodated fractions (WAFs) were created in the dark, full natural sunlight, with and without the dispersant (Corexit 9500A) and at varied salinity (0 and 35 psu). Acidic and basic soluble species were extracted and subsequent bacterial growth inhibition (toxicity) of natural seawater bacterial communities from the northern Gulf of Mexico was examined using 3H-leucine incorporation. Acid fractions containing dispersant were more toxic in WAFs made at low salinity compared to samples at higher salinity. In general, acid fractions created from sun exposure exhibited increased bacterial growth inhibition compared to dark samples. Basic fractions indicated toxicity was primarily due to the oil rather than dispersant.

Fractionation and biological toxicity studies of crude oil water accommodated fractions with dispersant

253rd National Meeting (2017)

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