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首页> 外文期刊>Journal of mass spectrometry: JMS >Electrospray ionization for determination of non-polar polyaromatic hydrocarbons and polyaromatic heterocycles in heavy crude oil asphaltenes
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Electrospray ionization for determination of non-polar polyaromatic hydrocarbons and polyaromatic heterocycles in heavy crude oil asphaltenes

机译：电喷雾电离法测定重质原油沥青质中的非极性聚芳烃和聚芳杂环

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摘要

Electrospray ionization (ESI) is the most common ionization method in atmospheric pressure ionization mass spectrometry because of its easy use and handling and because a diverse range of components can be effectively ionized from high to medium polarity. Usually, ESI is not employed for the analysis of non-polar hydrocarbons, but under some circumstances, they are effectively ionized. Polyaromatic hydrocarbons and aromatic heterocycles can form radical ions and protonated molecules after ESI, which were detected by Fourier transform ion cyclotron resonance mass spectrometry. The highly condensed aromatic structures are obtained from a heavy crude oil, and the results show class distribution from pure hydrocarbons up to more non-basic nitrogen-containing species. By using different solvent compositions [toluene/methanol (50/50v/v), dichloromethane/methanol (50/50v/v), dichloromethane/acetonitrile (50/50v/v) and chloroform], the results show that the lack of proton donor agent helps to preserve the radical formation that was created at the metal/solution interface inside the electrospray capillary. The results demonstrate that with an appropriate selection of solvent and capillary voltage, the ratio between the detected radical ion and protonated molecule form can be manipulated. Therefore, ESI can be expanded for the investigation of asphaltene and other polyaromatic systems beyond the polar constituents as non-polar hydrocarbons can be efficiently analyzed. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：电喷雾电离（ESI）是大气压电离质谱中最常用的电离方法，因为它易于使用和处理，并且可以从高极性到中极性有效地电离各种成分。通常，ESI不用于分析非极性碳氢化合物，但是在某些情况下，它们会被有效地电离。聚芳烃和芳族杂环可以在ESI后形成自由基离子和质子化分子，这是通过傅立叶变换离子回旋共振质谱法检测到的。高度浓缩的芳族结构是从重质原油中获得的，结果表明，从纯烃类到更多的非碱性含氮物质，其类别分布。通过使用不同的溶剂组成[甲苯/甲醇（50 / 50v / v），二氯甲烷/甲醇（50 / 50v / v），二氯甲烷/乙腈（50 / 50v / v）和氯仿]，结果表明缺乏质子施主剂有助于保持在电喷雾毛细管内部的金属/溶液界面处形成的自由基形成。结果表明，通过适当选择溶剂和毛细管电压，可以控制检测到的自由基离子与质子化分子形式之间的比率。因此，由于可以有效地分析非极性碳氢化合物，因此ESI可以扩展到用于研究沥青质和其他多芳族体系中极性组分以外的物质。版权所有（c）2015 John Wiley＆Sons，Ltd.

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