δ13C of aromatic compounds in sediments, oils and atmospheric emissions: A review

Holman, Alex I.; Grice, Kliti

doi:10.1016/j.orggeochem.2018.06.004

Cited by 37 publications

(16 citation statements)

References 113 publications

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“…Aromatization reactions that occur during combustion and hydrothermal processes do not fractionate (alter) δ 13 C composition . Furthermore, ConAC is resistant to biogeochemical alteration in the environment , and does not undergo isotopic fractionation during controlled biodegradation experiments on short time scales .…”

Section: Resultsmentioning

confidence: 99%

Characterization of Asphaltenes and Petroleum Using Benzenepolycarboxylic Acids (BPCAs) and Compound-Specific Stable Carbon Isotopes

et al. 2021

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Asphaltenes are unique molecules whose abundance and structure control physicochemical properties of petroleum. The structural appearance of asphaltenes (island versus archipelago architecture) is dependent upon the sample type and petroleum source, but distinguishing between the two architectures remains analytically challenging. Here, we present the application of the benzenepolycarboxylic acid (BPCA) molecular marker method to characterize the condensed aromatic core (ConAC) of asphaltenes. This thermochemolytic technique converts ConAC moieties to benzenehexacarboxylic (B6CA) and benzenepentacarboxylic (B5CA) acids, which are quantified chromatographically and used to estimate the quantity of ConAC in petrogenic samples. Sequential compound-specific isotope analysis (CSIA) with stable carbon isotopes (δ13C) of BPCA markers can provide an additional dimension of characterization relative to carbon source and processing. We analyzed the heavy Maya sour and light Marlin platform (MPCO) crude oils and their respective asphaltene fractions. Quantitative BPCA analysis revealed that Maya sour asphaltenes contained higher quantities of larger ConAC relative to MPCO asphaltenes. CSIA of individual BPCA markers showed that Maya sour asphaltenes are 13C-depleted relative to MPCO asphaltenes, even though bulk organic δ13C values were similar among sample types. Taken together, the results of quantitative and CSIA BPCA analyses suggest island-dominant architecture for Maya asphaltenes and archipelago-dominant architecture for MPCO asphaltenes. Therefore, BPCA quantification and BPCA-specific δ13C analysis may be a useful approach characterizing petrogenic samples as well as differentiating between structural architectures of condensed aromatic cores in asphaltenes. This article is in tribute to Dr. Alan G. Marshall for his numerous contributions to the scientific developments in analytical chemistry and environmental science, specifically the co-invention of the Fourier transform ion cyclotron resonance mass spectrometry (FT–ICR–MS) technique and his work toward the deconvolution of complex matrices, such as asphaltenes and petroleum.

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Section: Resultsmentioning

confidence: 99%

Characterization of Asphaltenes and Petroleum Using Benzenepolycarboxylic Acids (BPCAs) and Compound-Specific Stable Carbon Isotopes

et al. 2021

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“…Following this correction, all δ 13 C pyrene values from the Bengal Fan fell between those of C 3 ‐ and C 4 ‐derived PAHs from burn experiments using biomass (Guillon et al., 2013; O' Malley & Burke, 1997) (Figure 5). Additionally, there are no other known terrestrial sources of parent PAHs with values that are as enriched as those derived from C 4 plants (Holman & Grice, 2018), giving confidence to a 13 C‐enrichment in the pyrogenic PAHs as a signature of C 4 burning.…”

Section: Methodsmentioning

confidence: 99%

Late Miocene C₄ Grassland Fire Feedbacks on the Indian Subcontinent

Karp

Uno

Polissar

et al. 2021

Paleoceanog and Paleoclimatol

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The global expansion of tropical and subtropical C 4 -dominated biomes was one of the largest ecosystem shifts of the Cenozoic. This development drove mammalian evolution (Anderson, 2006), may have reduced global weathering (Beerling & Osborne, 2006;Beerling et al., 2012), and deepened soil carbon stocks (Beerling & Osborne, 2006;Still et al., 2003). Since the transition was first recognized, there has been spirited scientific debate as to the drivers for the opening of subtropical ecosystems (

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“… 27 These results revealed that the carbon isotopic compositions of P and MPs were not affected by the maturity at marginally to fully mature stages of thermal evolution. However, large variations of carbon isotopes in alkyl aromatics have been reported by geological samples 28 , 29 and oil pyrolysis, 30 probably because alkyl aromatics will be transformed into more stable isomers with the increase in thermal maturity and dealkylation reactions will occur at the high-over mature stages. 31 − 34 Meanwhile, oil pyrolysis performed by our group reported that the δ 13 C values of naphthalene (N) and phenanthrene (P) demonstrated minor variations.…”

Section: Introductionmentioning

confidence: 99%

Pyrolytic Evidence for Unsubstituted Aromatics as Potential Oil–Oil/Source Correlation Indicators

Chen

Zhang

et al. 2022

ACS Omega

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Most oil source correlation indicators are invalid because of the high maturity of the deep marine strata. Thus, a suitable indicator with high thermal stability requires to be established. In this study, to understand the effect of thermal maturation on the carbon isotopic composition of unsubstituted aromatics, we performed a number of anhydrous thermal simulation experiments involving two typical Chinese shales (lacustrine and marine shales), their corresponding expelled oils, three crude oils, and their associated oil fractions, that is, saturates, aromatics, resins, and asphaltenes (SARA). The generated unsubstituted aromatics were examined in terms of molecular distributions and carbon isotopic composition. The results show that unsubstituted aromatics in different types of samples demonstrated similar variation characteristics. Phenanthrene can be formed continuously in 0.45%/0.55–2.30% R o (equivalent vitrinite reflectance), especially in the high-over maturity stage. However, their carbon isotope composition shows minor variations. The unsubstituted aromatic carbon isotopic information in source rocks can be preserved during the whole pyrolysis process. Their carbon isotopic values in source rocks and their corresponding expelled oils are extremely similar. Furthermore, no evident difference exists in the carbon isotopes of unsubstituted aromatics formed by crude oil and associated oil fractions. These results indicate that these types of parameters are suitable for oil–oil/source correlation in deep marine strata with high-over maturity.

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δ13C of aromatic compounds in sediments, oils and atmospheric emissions: A review

Cited by 37 publications

References 113 publications

Characterization of Asphaltenes and Petroleum Using Benzenepolycarboxylic Acids (BPCAs) and Compound-Specific Stable Carbon Isotopes

Characterization of Asphaltenes and Petroleum Using Benzenepolycarboxylic Acids (BPCAs) and Compound-Specific Stable Carbon Isotopes

Late Miocene C₄ Grassland Fire Feedbacks on the Indian Subcontinent

Pyrolytic Evidence for Unsubstituted Aromatics as Potential Oil–Oil/Source Correlation Indicators

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δ13C of aromatic compounds in sediments, oils and atmospheric emissions: A review

Cited by 37 publications

References 113 publications

Characterization of Asphaltenes and Petroleum Using Benzenepolycarboxylic Acids (BPCAs) and Compound-Specific Stable Carbon Isotopes

Characterization of Asphaltenes and Petroleum Using Benzenepolycarboxylic Acids (BPCAs) and Compound-Specific Stable Carbon Isotopes

Late Miocene C4 Grassland Fire Feedbacks on the Indian Subcontinent

Pyrolytic Evidence for Unsubstituted Aromatics as Potential Oil–Oil/Source Correlation Indicators

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Late Miocene C₄ Grassland Fire Feedbacks on the Indian Subcontinent