Effect of Dispersant on Molecular Composition and Fate of Oil Exposed to Sunlight in Seawater Systems

Abstract

Oil spilled in aquatic systems is exposed to sunlight, resulting in important photochemical processes. Photochemistry likely plays a major role in the fate of oil spilled in areas with sunlight exposure, especially since high molecular weight aromatics are readily photodegraded but are resistant to biodegradation. In order to gain a clearer understanding of the water soluble compounds that are produced as a result of photoegradation, a study was performed to identifiy the water soluble compounds produced from sunlight irradiated oil films. Macondo Well oil was used in this study. A dark and irradiated sample were compared. The irradiated water fraction showed a large amount of oxygenated compounds produced. We utilized FT-ICR MS to identify water soluble compounds from irradiated oil on water. These results will enhance understanding of what type of water soluble compounds are formed in the water as a result of photodegradation and photooxidation. Work performed at the National High Magnetic Field Laboratory was supported by NSF Division of Materials Research through DMR-11-57490, BP/The Gulf of Mexico Research Initiative to the Deep-C Consortium, and the State of Florida. Work performed at the University of New Orleans was supported by the U.S. National Science Foundation (CHE-1111525) and BP/The Gulf of Mexico Research Initiative.