# Presto:  Corexit® dispersant ingredients revealed

*Published:* 2010-06-08
*Author:* 

*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](http://www.epa.gov/bpspill/dispersants.html#list). 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**57-55-61,2-Propanediol111-76-2Ethanol, 2-butoxy-577-11-7Butanedioic acid, 2-sulfo-, 1,4-bis(2-ethylhexyl) ester, sodium salt (1:1)1338-43-8Sorbitan, mono-(9Z)-9-octadecenoate9005-65-6Sorbitan, mono-(9Z)-9-octadecenoate, poly(oxy-1,2-ethanediyl) derivs.9005-70-3Sorbitan, tri-(9Z)-9-octadecenoate, poly(oxy-1,2-ethanediyl) derivs29911-28-22-Propanol, 1-(2-butoxy-1-methylethoxy)-64742-47-8Distillates (petroleum), hydrotreated lightMore to come.