EPR and Fluorescence Spectroscopy in the Photodegradation Study of Arabian and Colombian Crude Oils

Guedes, Carmen L. B.; Di Mauro, Eduardo; De Campos, Ariana; Mazzochin, Leandro F.; Bragagnolo, Gislaine M.; De Melo, Fernando A.; Piccinato, Marilene T.

doi:https://doi.org/10.1155/IJP/2006/48462

International Journal of Photoenergy

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Volume 2006 | Article ID 048462 | https://doi.org/10.1155/IJP/2006/48462

EPR and Fluorescence Spectroscopy in the Photodegradation Study of Arabian and Colombian Crude Oils

Carmen L. B. Guedes,¹Eduardo Di Mauro,¹Ariana De Campos,¹Leandro F. Mazzochin,¹Gislaine M. Bragagnolo,¹Fernando A. De Melo,¹and Marilene T. Piccinato¹

Received28 Feb 2006

Revised26 Jul 2006

Accepted26 Jul 2006

Published18 Oct 2006

Abstract

EPR and fluorescence spectroscopy were used to evaluate the degradation of crude oils of different origins that were submitted to photochemical weathering under tropical conditions. The EPR spectra obtained showed signals of the paramagnetic species: the vanadyl VO2+ ion and organic free radicals. A decrease in linewidth of free radical signals was observed for both oils irradiated for 100 hours with sunlight of 350 W/m2. The reduction in the linewidth of the free radical of 9.8% in Arabian oil and 18.5% in Colombian oil, as well as the decrease in radical numbers, indicated photochemical degradation, especially in Colombian oil. The linewidth narrowing corresponding to free radicals in the irradiated oils occurred due to the rearrangement among radicals and aromatic carbon consumption. The irradiated oils showed a reduction in the relative intensity of fluorescence of the aromatics with high molecular mass, polar aromatics, and asphaltene. The fluorescent fraction was reduced by 61% in Arabian oil and 72% in Colombian oil, corresponding to photochemical degradation of crude oil aromatic compounds.

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Copyright © 2006 Carmen L. B. Guedes et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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