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Early products in the line included Corexit 7664 [4] and Corexit 8666. Corexit 9527 is one of the first modern concentrate dispersants and has been in use since the mid 1970s. Corexit 9500 was designed to replace Corexit 9527. In 2002, Corexit 9527 and Corexit 9500 were the only two chemical dispersants stockpiled in large quantities in the U.S ...
The primary dispersant used were Corexit 9527 and 9500, which were controversial due to toxicity. In 2012, a study found that Corexit made the oil up to 52 times more toxic than oil alone, [ 12 ] and that the dispersant's emulsifying effect makes oil droplets more bio-available to plankton . [ 13 ]
Toxicologist and marine biologist Riki Ott has also spoken on the toxicity of the spilled crude oil and of the dispersant Corexit, "The dispersants used in BP's draconian experiment contain solvents, such as petroleum distillates and 2-butoxyethanol. Solvents dissolve oil, grease, and rubber.
On 19 May, the EPA gave BP 24 hours to choose less toxic alternatives to Corexit from the list of dispersants on the National Contingency Plan Product Schedule and begin applying the new dispersant(s) within 72 hours of EPA approval or provide a detailed reasoning why the approved products did not meet the required standards. [49] [50]
If you’re unsure whether your cat needs a medical evaluation, try calling the ASPCA Animal Poison Control Center (888-426-4435) or the Pet Poison Hotline (855-764-7661).
Acute toxicity describes the adverse effects of a substance that result either from a single exposure [1] or from multiple exposures in a short period of time (usually less than 24 hours). [ 2 ] To be described as acute toxicity, the adverse effects should occur within 14 days of the administration of the substance.
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 ...
The pesticide is generally given orally. [2] The substance is a vitamin K antagonist. The lack of vitamin K in the circulatory system reduces blood clotting and will cause death due to internal hemorrhaging. [2] Poisoning does not show effects for 24 to 36 hours after it is eaten and can take up to 2–5 days to cause death. [clarification needed]