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The dispersal agent Corexit 9500 is a solvent originally developed by Exxon and now manufactured by the Nalco Holding Company of Naperville, Illinois that is four times more toxic than oil (oil is toxic at 11 ppm (parts per million), Corexit 9500 at only 2.61ppm).
In a report written by Anita George-Ares and James R. Clark for Exxon Biomedical Sciences, Inc. titled
“Acute Aquatic Toxicity of Three Corexit Products: An Overview”
Corexit 9500 was found to be one of the most toxic dispersal agents ever developed.
Even worse, according to this report, with higher water temperatures, like those now occurring in the Gulf of Mexico, its toxicity grows.
The United States Environmental Protection Agency (EPA) in discovering BP’s use of this dangerous dispersal agent ordered BP to stop using it, but BP refused stating that their only alternative to Corexit 9500 was an even more dangerous dispersal agent known as Sea Brat 4.