Role of entrained droplet oil on the bioavailability of petroleum substances in aqueous exposures.
Bioavailability of petroleum substances is a complex issue that is affected by substance composition, the physicochemical properties of the individual constituents, and the exposure preparation system. The present study applies mechanistic fate and effects models to characterize the role of droplet oil on dissolved exposure and predicted effects from both neat and weathered crude oils, and refined fuel oils. The main effect from droplet oil is input of additional dissolved hydrocarbons to the exposure system following preparation of the initial stock solution. Toxicity was characterized using toxic units (TU) and shows that replenishment of bioavailable hydrocarbons by droplets in toxicity tests with low droplet content (e.g., <1mg/L) is negligible, consistent with typical exposure conditions following open ocean oil spills. Further, the use of volumetric exposure metrics (e.g., mg/L) introduces considerable variability and the bioavailability-based metrics (e.g., TUs) provide a more consistent basis for understanding oil toxicity data.
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D001682:Biological Availability D005648:Fuel Oils D006838:Hydrocarbons D008962:Models, Theoretical D010578:Petroleum D059392:Petroleum Pollution D014867:Water D014874:Water Pollutants, Chemical
Droplet oil Oil toxicity Dispersed oil Oil bioavailability