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Development of novel method for enrichment of unsubstituted naphthalene and phenanthrene from crude oils to compound-specific stable isotope analysis

Abstract

A novel, effective and easy-to-operate method to enrich unsubstituted naphthalene and phenanthrene directly from crude oil was developed based on close-system pyrolysis. The pyrolysis at 500 °C for 12 h was found to be sufficient for the enrichment of unsubstituted aromatics that were free of unresolved complex mixture (UCM) and poly-substituted aromatics. It allowed further accurate compound specific isotope analysis, and GC-IRMS data showed that the δ13C values of unsubstituted naphthalene and phenanthrene had no obvious fractionation during the enrichment process. This method provides easy-to-operate pre-concentration technique of unsubstituted aromatics suitable for compound-specific isotope analysis (CSIA), laying the foundation for developing new oil-oil correlation indicators.

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Publication details

The article was received on 17 May 2017, accepted on 01 Aug 2017 and first published on 02 Aug 2017


Article type: Paper
DOI: 10.1039/C7AY01257H
Citation: Anal. Methods, 2017, Accepted Manuscript
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    Development of novel method for enrichment of unsubstituted naphthalene and phenanthrene from crude oils to compound-specific stable isotope analysis

    Y. Chen, X. Zhang, J. Chang, S. Ma, Y. Wu and Y. Xia, Anal. Methods, 2017, Accepted Manuscript , DOI: 10.1039/C7AY01257H

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