Atmospheric pressure chemical ionization Fourier transform ion cyclotron resonance mass spectrometry for complex thiophenic mixture analysis

摘要: RATIONALE Polycyclic aromatic sulfur heterocycles (PASHs) are detrimental species for refining processes in petroleum industry. Current mass spectrometric methods that determine their composition often preceded by derivatization and dopant addition approaches. Different ionization have different impact on the molecular assignment of complex PASHs. The analysis such under atmospheric pressure chemical (APCI) is still considered limited due to uncontrolled ion generation with low- high-mass METHODS behavior a model mixture five selected PASH standards was investigated using an APCI source nitrogen as reagent gas. A thiophenic fraction separated from vacuum gas oil (VGO) injected same method. samples were analyzed Fourier transform cyclotron resonance spectrometry (FTICR MS). RESULTS analytes successfully ionized mainly [M + H](+) ions produced. pattern observed real sample. It found S1 class major sulfur-containing VGO These indicated presence alkylated benzothiophenic (BT), dibenzothiophenic (DBT) benzonaphthothiophenic (BNT) series detected APCI-FTICR MS. CONCLUSIONS This study provides established MS method PASHs without any fragmentation. can be used S-containing crude samples.