Richard Denison, Ph.D., is a Senior Scientist.
With no fanfare whatsoever, a list of the ingredients in the Corexit® dispersants has been posted on EPA’s website. I can’t say when the list appeared — I was pointed to it by Elana Schor, a reporter with E&E News, who discovered the list a little earlier today, buried well down on the agency’s dispersants page.
The components of COREXIT® 9500 and 9527 are:
| CAS Registry Number | Chemical Name |
| 57-55-6 | 1,2-Propanediol |
| 111-76-2 | Ethanol, 2-butoxy- |
| 577-11-7 | Butanedioic acid, 2-sulfo-, 1,4-bis(2-ethylhexyl) ester, sodium salt (1:1) |
| 1338-43-8 | Sorbitan, mono-(9Z)-9-octadecenoate |
| 9005-65-6 | Sorbitan, mono-(9Z)-9-octadecenoate, poly(oxy-1,2-ethanediyl) derivs. |
| 9005-70-3 | Sorbitan, tri-(9Z)-9-octadecenoate, poly(oxy-1,2-ethanediyl) derivs |
| 29911-28-2 | 2-Propanol, 1-(2-butoxy-1-methylethoxy)- |
| 64742-47-8 | Distillates (petroleum), hydrotreated light |
More to come.