PETROLEUM ANALYSIS BY LASER-INDUCED ACOUSTIC DESORPTION/CHEMICAL IONIZATION MASS SPECTROMETRY

摘要

Petroleum distillates derived from crude oil can be viewed as containing two major groups of compounds,nonpolar hydrocarbons (approx 90%)and polar hydrocarbons (approx 10%).Here,the term "nonpolar hydrocarbons"includes both saturated and aromatic molecules,such as alkanes,cycloalkanes,polyaromatic hydrocarbons and sulfurcontaining aromatic hydrocarbons."Polar hydrocarbons"are compounds that contain one or more heteroatoms,most commonly nitrogen,oxygen,Ni and V (metalloporphyrins).Mass spectrometry can provide detailed molecular information for the polar petroleum components,but analysis of the saturated hydrocarbon part is hindered by difficulties in ionization without fragmentation.