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ABSTRACT
Surfactant formulations used in chemical dispersing agents are derived from the same functional components used in numerous household products such as dishwashing soaps and laundry detergents. During the Deep Water Horizon (DWH) oil spill response, a significant volume of chemical dispersant was deployed, causing members of the public and the media to question the role of chemical dispersant (Corexit 9500) usage in mitigating oil spill effects. Consequently, laboratory tests were conducted by regulatory agencies to further evaluate and substantiate the existing aquatic toxicity of Corexit dispersants. To help put dispersant toxicity in context, two independent accredited labs were commissioned to conduct parallel studies that compared the acute toxicity of Corexit 9500 to common household cleaning agents. The results indicate that the acute toxicity of Corexit 9500 to marine aquatic organism is either within the median range or less toxic than the household cleaning agents tested. The median LC50 value for Corexit 9500 exposures to Americamysis bahia was 42.5 mg/L (four products were less toxic and four products were more toxic); whereas, the median LC50 value for Corexit 9500 exposures to Menidia beryllina was 73.1 mg/L (one product was less toxic and seven products were more toxic).