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Development of a novel method for the enrichment of unsubstituted naphthalene and phenanthrene from crude oils for compound-specific stable isotope analysis
- Chen, Yongxin, Zhang, Xilong, Chang, Jiang, Ma, Suping, Wu, Yingqin, Xia, Yanqing
- Analytical methods 2017 v.9 no.35 pp. 5135-5139
- analytical methods, carbon, fractionation, naphthalene, petroleum, phenanthrenes, pyrolysis, stable isotopes
- A novel, effective and easy-to-operate method to enrich unsubstituted naphthalene and phenanthrene directly from crude oils was developed based on closed-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. This 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 an easy-to-operate pre-concentration technique for unsubstituted aromatics suitable for compound-specific isotope analysis (CSIA), laying the foundation for developing new oil–oil correlation indicators.