Characterization of aromatic steroids and hopanoids in marine and lacustrine crude oils using comprehensive two dimensional gas chromatography coupled to time-of-flight mass spectrometry (GCxGC-TOFMS) |
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| Affiliation: | 1. College of Navigation, Dalian Maritime University, Dalian 116026, China;2. College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China;3. Maritime Safety Administration of the People''s Republic of China, Beijing 100736, China;1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China;2. Yantai Oil Spill Response Technical Center of Yantai Maritime Safety Administration, Yantai 264000, China;3. Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China |
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| Abstract: | The distribution of the aromatic steroids and hopanoids in six crude oils was determined using comprehensive two dimensional gas chromatography time-of-flight mass spectrometry (GCxGC-TOFMS) in order to improve their identification and application in geochemical studies. Co-elution between monoaromatic and triaromatic steroids and benzohopanes and their methylated homologues, which are commonly observed in 1D conventional GC, were resolved, with GCxGC facilitating recognition of the compounds. One important feature was that, despite the oils showing mid-oil window maturity characteristics, the distribution of long chain aromatic steroids decreased in lacustrine samples vs. marine samples. This difference in the distribution of long chain and short chain aromatic steroids may reflect the different origins of these oils although this aspect needs further evaluation. |
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