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Detailed chemical analysis of a fully formulated oil using dielectric barrier discharge ionisation-mass spectrometry

Basham, V., Hancock, T., McKendrick, J. ORCID:, Tessarolo, N. and Wicking, C. (2022) Detailed chemical analysis of a fully formulated oil using dielectric barrier discharge ionisation-mass spectrometry. Rapid Communications in Mass Spectrometry, 36 (14). e9320. ISSN 1097-0231

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To link to this item DOI: 10.1002/rcm.9320


RATIONALE: Fully formulated oils (FFOs) are integral to automotive lubrication, however detailed compositional analysis is challenging due to high levels of chemical complexity. In particular, existing mass spectrometric approaches often target particular FFO components, leading to poor analytical coverage of the overall formulation, with increased overheads and analytical timescales. METHODS: Herein we report the application of a commercially available SICRIT SC-20 dielectric barrier discharge ionisation (DBDI) source and Thermo Fisher Scientific LTQ Orbitrap XL to the analysis of an FFO. N2 was used as a discharge gas for the DBDI source, and was modified using a range of commonplace solvents to tailor the experimental conditions for the analysis of different components. RESULTS: The reported method allowed analysis of a range of FFO components of interest, encompassing a wide range of chemistries, in under 1 minute. By modifying the discharge gas used for ionisation, experiments could be optimised for the analysis of particular FFO components across positive and negative ion modes. In particular, use of water vapour as a discharge gas modifier with positive ion mode mass spectrometry permitted concomitant analysis of antioxidants and base oil hydrocarbons. Furthermore, case studies of selected linear alkanes and alkenes profile the differences in the range of ions formed across these saturated and unsaturated aliphatic compounds, giving insight into the fate of base oil hydrocarbons in FFO analyses. CONCLUSIONS: A rapid method for analysis of FFO compositions has been developed and provides coverage of a range of components of interest. The results indicate that the method presented may be of utility in analysis of other FFOs or similarly challenging complex mixtures.

Item Type:Article
Divisions:Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
Interdisciplinary centres and themes > Chemical Analysis Facility (CAF) > Mass Spectrometry (CAF)
ID Code:105126


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