Application of the Mason鈭扴champ Equation and Ion Mobility Mass Spectrometry To Identify Structurally Related Compounds in Crude Oil

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• 作者：Arif Ahmed ; Yun Ju Cho ; Myoung-han No ; Jaesuk Koh ; Nicholas Tomczyk ; Kevin Giles ; Jong Shin Yoo ; Sunghwan Kim
• 刊名：Analytical Chemistry
• 出版年：2011
• 出版时间：January 1, 2011
• 年：2011
• 卷：83
• 期：1
• 页码：77-83
• 全文大小：336K
• 年卷期：v.83,no.1(January 1, 2011)
• ISSN：1520-6882

文摘

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鈭抦obility 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.