Elimination of the Ion–Molecule Association in Electrospray High-Resolution Mass Spectrometry Analyses for Petroleum Fractions

Electrospray ionization (ESI) coupled with high-resolution mass spectrometry (HRMS) is rapidly developing into a powerful tool for the molecular characterization of petroleum fractions. However, occurrence ion–molecule aggregates seriously affects interpretation results. Ion–molecule are not inherent compounds in but they produced during analysis samples by spectrometry. Also, classes same as many petroleum. Therefore, removal these species crucial, and their from methods dissociation mechanism points view essential this purpose. In study, vacuum gas oil fraction were analyzed types defined. The compositions characterized changing operating conditions. Several factors affecting evaluated parameter efficiency. By establishing methods, residual content can be controlled less than 1% total ions. results instructive fractions using ESI ionization.