Multifaceted crude oil analysis using GC-EI/FI, blank tube-FI, and FD on JMS-T2000GC
Introduction
JMS-T2000GC can switch ionization methods without breaking the vacuum by using a EI/FI/FD* combination ion source. In this MSTips, we will introduce crude oil analysis that takes advantage of these ionization methods. Figure 1 shows a schematic diagram of the four analytical methods used in this experiment, and Table 1 shows their characteristics. In ①GC-EI and ②GC-FI, the sample is introduced into the GC injection port, separated by the GC column, and measured using hard ionization EI and soft ionization FI. These two measured data can be integrated and analyzed using msFineAnalysis AI. In ③Blank tube-FI, the sample is introduced into the GC injection port, passed through the blank tube, and measured using soft ionization FI. In ④FD, the sample is applied directly to the emitter and measured using a soft ionization FD. These mass spectra obtained by soft ionization can be easily analyzed using msRepeatFinder.
*EI: Electron Ionization, FI: Field Ionization, FD: Field Desorption, **KMD：Kendrick Mass Defect