Effects of oil dispersant on ozone oxidation of phenanthrene and pyrene in marine water

TitleEffects of oil dispersant on ozone oxidation of phenanthrene and pyrene in marine water
Publication TypeJournal Article
Year of Publication2017
AuthorsGong Y.Y, Zhao D.Y
JournalChemosphere
Volume172
Pagination468-475
Date PublishedApr
ISBN Number0045-6535
Accession NumberWOS:000394065200053
KeywordsOil and Gas Degradation
AbstractThis work investigated effects of a popular oil dispersant (Corexit EC9500A) on oxidation of phenanthrene and pyrene (two model polycyclic aromatic hydrocarbons) in Gulf coast seawater under simulated atmospheric ozone. The degradation data followed a two-stage pseudo-first order kinetics, a slower initial reaction rate followed by a much faster rate in longer time. The ozonation rate for pyrene was faster than that for phenanthrene. The presence of 18 and 180 mg/L of the dispersant inhibited the first order degradation rate by 32-80% for phenanthrene, and 51-85% for pyrene. In the presence of 18 mg/L of the dispersant, the pyrene degradation rate increased with increasing ozone concentration, but decreased with increasing solution pH and temperature, while remained independent of ionic strength. For the first time, the results indicate that atmospheric ozone may play a significant role in the weathering of dispersed persistent oil components in natural and engineered systems. (C) 2017 Elsevier Ltd. All rights reserved.
DOI10.1016/j.chemosphere.2017.01.007