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Compared with 12 other dispersants listed by the EPA, Corexit 9500 and 9527 are either similarly toxic or 10 to 20 times more toxic. [58] In a preliminary EPA study of eight different dispersants, Corexit 9500 was found to be less toxic to some marine life than other dispersants and to break down within weeks, rather than settling to the bottom ...
[22] [23] Although the US EPA completed a series of trials on determining the toxicity of EC900A, which concluded it was “slightly toxic” or “practically non-toxic”, they did not evaluate the toxicity of EC9527A. Even with EX9500A, subsequent studies have shown that it does exhibit toxic effects, and more studies are evaluating the ...
The 12 July 2010 BP report listed available stocks of Corexit which decreased by over 965,000 US gallons (3,650 m 3) without reported application, suggesting either stock diversion or unreported application. Under reported subsea application of 1.69 million US gallons (6,400 m 3) would account for this discrepancy
The oil slick as seen from space by NASA's Terra satellite on 24 May 2010. The 2010 Deepwater Horizon oil spill in the Gulf of Mexico has been described as the worst environmental disaster in the United States, releasing about 4.9 million barrels (210 million US gal; 780,000 m 3) of crude oil making it the largest marine oil spill in history.
In 40 CFR 156.62, the EPA established four Toxicity Categories for acute hazards of pesticide products, with "Category I" being the highest toxicity category (toxicity class). Most human hazard, precautionary statements, and human personal protective equipment statements are based upon the Toxicity Category of the pesticide product as sold or ...
By comparison, Corexit, the oil dispersant used in the Deepwater Horizon oil spill, is rated at 54.7% effective against South Louisiana crude oil and three times as lethal to silverfish and more than twice as lethal to shrimp. [5] On May 20, US Polychemical Corporation was reported to have received an order from BP for Dispersit SPC 1000. [6]
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The National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling is a bipartisan presidential commission, established by Executive Order 13543 signed by Barack Obama on May 21, 2010, that is "tasked with providing recommendations on how the United States can prevent and mitigate the impact of any future spills that result from offshore drilling."