Photochemical changes in water accommodated fractions of MC252 and surrogate oil created during solar exposure as determined by FT-ICR MS

Marine Pollution Bulletin
Pamela P VaughanWade H Jeffrey

Abstract

To determine effects of photochemical weathering of petroleum, surrogate and Macondo (MC252) crude oils were exposed to solar radiation during the formation of Water Accommodated Fractions (WAFs) in sterile seawater. Samples were incubated in either unfiltered sunlight, with ultraviolet radiation blocked (Photosynthetically Active Radiation [PAR] only), or in darkness. WAFs were collected at two time points over the course of a week. Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FT-ICR MS) analyses of water soluble species formed during exposure to sunlight were compared for the different treatments. Photochemical alterations resulted in differences in compound class distributions. In general, surrogate oil was photo-oxidized across a wider carbon number range compared to MC252. While photochemical differences were observed between MC252 and surrogate oils, microbial production in seawater responded similarly to both WAFs from both types of oils with the majority of the inhibition resulting from oil exposure to visible light.

References

Jul 20, 2011·Proceedings of the National Academy of Sciences of the United States of America·Christopher M ReddyRichard Camilli
Sep 29, 2011·Journal of the American Society for Mass Spectrometry·Nathan K KaiserAlan G Marshall
Feb 3, 2012·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Homer C GenuinoSteven L Suib
Jul 20, 2012·Environmental Science & Technology·Christoph AeppliChristopher M Reddy
Sep 16, 2014·Journal of Hazardous Materials·Phoebe Z RayMatthew A Tarr

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Citations

Jul 16, 2021·Journal of Contaminant Hydrology·Kirk T O'ReillyCatalina Espino Devine
Mar 5, 2019·Environmental Science & Technology·Andrew S WozniakPatrick G Hatcher

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