title: Weathering trend characterization of medium-molecular weight polycyclic aromatic disulfur heterocycles by Fourier transform ion cyclotron resonance mass spectrometry.
abstract: Different weathering factors act to change petroleum composition once it is spilled into the environment. n-Alkanes, biomarkers, low-molecular weight polyaromatic hydrocarbons and sulfur heterocycles compositional changing in the environment have been extensively studied by different researchers and many parameters have been used for oil source identification and monitoring of weathering and biological degradation processes. In this work, we studied the fate of medium-molecular weight polycyclic aromatic disulfur heterocycles (PAS2Hs), up to ca. 900Da, of artificially weathered Flotta North Sea crude oil by ultra high-resolution Fourier transform ion cyclotron resonance mass spectrometry. It was found that PAS2Hs in studied crude oil having double bond equivalents (DBE) from 5 to 8 with a mass range from ca 316 to 582Da were less influenced even after six months artificial weathering experiment. However, compounds having DBEs 12, 11 and 10 were depleted after two, four and six months weathering, respectively. In addition, DBE 9 series was more susceptible to weathering than those of DBE 7 and 8.
authors.affiliation: Chemistry Department, Faculty of Science, Alexandria University, P.O. Box 426, Alexandria 21321, Egypt; Institute of Inorganic and Analytical Chemistry, University of Münster, Corrensstrasse 30, 48149 Münster, Germany; Chemistry Department, Faculty of Science, Taibah University, P.O. Box 30002, Al-Madinah Al-Munawarah, Saudi Arabia. Electronic address: ahegazih@yahoo.com.
authors.forename: Abdelrahman H
authors.initials: AH
authors.lastname: Hegazi
authors.affiliation: Chemistry Department, Faculty of Science, Alexandria University, P.O. Box 426, Alexandria 21321, Egypt; Institute of Inorganic and Analytical Chemistry, University of Münster, Corrensstrasse 30, 48149 Münster, Germany; Chemistry Department, Faculty of Science, Taibah University, P.O. Box 30002, Al-Madinah Al-Munawarah, Saudi Arabia.
authors.forename: Eiman M
authors.initials: EM
authors.lastname: Fathalla
authors.affiliation: Institute of Inorganic and Analytical Chemistry, University of Münster, Corrensstrasse 30, 48149 Münster, Germany.
authors.forename: Jan T
authors.initials: JT
authors.lastname: Andersson
mesh_terms: D052918:Environmental Restoration and Remediation; D005583:Fourier Analysis; D006571:Heterocyclic Compounds / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism; D013058:Mass Spectrometry; D008970:Molecular Weight; D059392:Petroleum Pollution; D013457:Sulfur Compounds / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors
chemical_list: D006571:Heterocyclic Compounds; D013457:Sulfur Compounds
keywords: Disulfur heterocycles; Fourier transform ion cyclotron resonance mass spectrometry; Oil pollution; Weathering