BP has applied more than 400,000 gallons of a chemical dispersant called Corexit to help break up the oil slick in the Gulf of Mexico, and has reserved orders for another 805,000 gallons. But Corexit, which is made by a company with close ties to BP and ExxonMobil, has been found to be more toxic and less effective in breaking up southern Louisiana crude than dispersants from other companies, according to data from the Environmental Protection Agency.

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