Molecular characterization of non-acidic compounds in oil residues by Fourier-transform ion cyclotron resonance (FT-ICR) Mass Spectrometry analysis, 2011-01-06 to 2018-10-30

In addition to acidic compounds characterization, a qualitative map of non-acidic compounds in salt marsh sediments (e.g., nonpolar aromatics and basic compounds) was generated. Weathered oil extracts from Louisiana Salt Marshes were analyzed by positive electrospray ionization (ESI) with Lithium chloride (LiCl) to aid in protonation and Li+ adduct formation to target oxidation products. Atmospheric pressure photoionization (APPI) will also be coupled to Fourier-transform ion cyclotron resonance Mass Spectrometry (FT-ICR MS) for sample analysis to target polar and nonpolar species simultaneously and thus capture the molecular compositional changes of these compounds as a function of long-term environmental exposure.除完成酸性化合物表征外，本研究还构建了盐沼沉积物中非酸性化合物（如非极性芳烃与碱性化合物）的定性图谱。研究采用结合氯化锂（LiCl）的正模式电喷雾电离（electrospray ionization，ESI）辅助质子化与锂离子加合物形成，以靶向检测氧化产物，对路易斯安那州盐沼的风化油提取物开展了分析。此外，还将采用大气压光致电离（Atmospheric pressure photoionization，APPI）与傅里叶变换离子回旋共振质谱（Fourier-transform ion cyclotron resonance Mass Spectrometry，FT-ICR MS）联用进行样品分析，可同时靶向极性与非极性物种，进而捕捉这些化合物随长期环境暴露所发生的分子组成变化。