Atmospheric Pressure Photoionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry for Detailed Compositional Analysis of Petroleum (ABSTRACT)

摘要

Fourier transform ion cyclotron resonance mass spectrometry's inherent high resolution and mass accuracy make it well-suited for compositional analysis (at the level of molecular formula identification) of complex mixtures such as crude oil. Soft ionization techniques such as MALDI, field desorption, field ionization, electrospray ionization and atmospheric pressure photoionization (APPI) have been applied to the mass spectral analysis of petroleum because they seldom produce fragment ions in the ionization process. However, conditions must be carefully controlled to avoid unwanted fragmentation that complicates an already crowded mass spectrum. Specifically, APPI is ideal for crude oil since it ionizes both polar (ie, pyridinic and pyrrolic nitrogen, carboxylic acids) and nonpolar species (ie, PASH's, PAH's, PANH's) simultaneously.