GCxGC TOFMS Analysis of Base Oils with CI, PI, FI March 4, 2020 AccuTOF™ GC, Application Note, GCxGC, Mass Spectrometry (MS), Petroleum 0 Introduction Structural elucidation of hydrocarbon classes in petroleum products are always in high demand. Comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry (GCxGC-TOFMS) with electron ionization (EI) is a powerful method for characterizing complex mixtures such as base oils. However, EI data can often lack a strong molecular ion signal. Therefore, it is necessary to measure samples with soft-ionization methods such as positive chemical ionization (PCI), field ionization (FI), or photo-ionization (PI) for the detection of molecular ions. Each technique is a little different so it is important to understand the characteristics of each soft ionization method. In this application note, we compare the mass spectra of a base oil analyzed by GCxGC-TOFMS with EI, PCI, FI, and PI. Experiment The details for sample dilution in hexane as well as the instrumental conditions are listed in Table 1. For full details: Attached files often contain the full content of the item you are viewing. Be sure and view any attachments. GCxGC Analysis of Base Oils with CI FI PI.pdf 342.05 KB Showing 0 Comment Comments are closed.