On April 20, 2010, the Deepwater Horizon offshore oil drilling rig exploded and started leaking oil 5,000 feet below the ocean’s surface in the Gulf of Mexico. A process known as a Natural Resource Damage Assessment (NRDA) was set in motion under the Oil Pollution Act of 1990. With the combined help of many federal and state agencies, private industries, and academic institutions, years’ worth of data have been collected and the analytical chemistry results from the Deepwater Horizon oil spill have finally been made available to the public.
Here is a link to the site where you can find those results:
http://www.nodc.noaa.gov/deepwaterhorizon/specialcollections.html