Application of the Mason−Schamp Equation and Ion Mobility Mass Spectrometry To Identify Structurally Related Compounds in Crude Oil
| Autor: | Sunghwan Kim, Jaesuk Koh, Yunju Cho, Nicholas Tomczyk, Arif Ahmed, Kevin Giles, Jong Shin Yoo, Myoung-han No |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Analytical Chemistry. 83:77-83 |
| ISSN: | 1520-6882 0003-2700 |
| Popis: | The various components of crude oil were structurally resolved using an atmospheric-pressure solids analysis probe (ASAP) coupled with ion mobility mass spectrometry (IM-MS). An ASAP source was used to broadly fractionate compounds according to their boiling points, thereby simplifying the resulting mass spectra for easier data interpretation. The m/z-mobility plots obtained by IM-MS analysis of crude oil could be used to find the structural relationship between crude oil molecules. That was demonstrated using ion mobility mass spectra from a homologous series of compounds, differing only by the number of alkyl units, found in crude oil. The peaks from this series were linearly aligned in the plot, suggesting a continuous increase of the collisional cross section with an increase of mass values and hence the absence of significant structural differences within the series. In contrast, peaks in a homologous series differing only in the number of pendant hydrogen atoms were not linearly aligned, suggesting a discontinuous increase of the collisional cross section with an increase of mass values and hence significant structural differences due to the addition or removal of hydrogen. Cases in which a slope change was observed at three- or four-peak intervals may be related to the addition of an aromatic ring to existing structures. Overall, ion mobility mass spectrometry demonstrates a useful tool that can be used to elucidate structural relationships between molecules comprising crude oil. |
| Databáze: | OpenAIRE |
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