Impact of Different Ionization Methods on the Molecular Assignments of 
Asphaltenes by FT-ICR Mass Spectrometry

Gaspar, Andras; Zellermann, Elio; Lababidi, Sami; Reece, Jennifer; Schrader, Wolfgang

doi:10.1021/ac300133p

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Impact of Different Ionization Methods on the Molecular Assignments of Asphaltenes by FT-ICR Mass Spectrometry

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Gaspar, Andras
Service Department Schrader (MS), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Zellermann, Elio
Service Department Schrader (MS), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Lababidi, Sami
Service Department Schrader (MS), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Reece, Jennifer
Service Department Schrader (MS), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Schrader, Wolfgang
Service Department Schrader (MS), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Gaspar, A., Zellermann, E., Lababidi, S., Reece, J., & Schrader, W. (2012). Impact of Different Ionization Methods on the Molecular Assignments of Asphaltenes by FT-ICR Mass Spectrometry. Analytical Chemistry, 84(12), 5257-5267. doi:10.1021/ac300133p.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000E-EA98-A

Abstract

Over the years, ultrahigh resolution mass spectrometry has successfully illustrated the extreme complexity of crude oil and related solubility or polarity based fractions on a molecular level. However, the applied ionization technique greatly influences the outcome and may provide misleading information. In this work, we investigate the atmospheric pressure laser ionization (APLI) technique coupled with Fourier transform ion cyclotron resonance mass spectrometer to analyze the asphaltene fraction of a crude oil. These results were compared to data obtained by using other existing atmospheric pressure ionization methods. Furthermore elemental analysis and solid state NMR were used to obtain the bulk characteristics of the asphaltene sample. The results of the different ionization techniques were compared with the bulk properties in order to describe the potential discrimination effects of the ionization techniques that were observed. The results showed that APLI expands the range of the assigned molecules, while retaining information already observed with the generally used ion sources.