【摘要】 将大气压光电离(APPI)、电喷雾(ESI)、实时直接分析(DART)多种电离源和傅立叶变换离子回旋共振质谱(FT-ICR MS)联用对石油芳烃样品中的未知化合物进行研究。通过高分辨质谱的精确质量,结合碰撞诱导解离(CAD)技术,经分析并与文献标准物质谱图比对,推断未知物为三(2,4-二-叔丁基苯基)磷酸酯(TDTBPP),并研究了其在不同大气压电离源中的电离特性。APPI谱图中主要为[M+H]~+峰,同时存在M.~+峰。ESI谱图中主要为[M+Na]~+(不加甲酸)或[M+NH4]~+峰(加甲酸)。DART谱图中主要为[M+NH4]~+峰,而EI谱图中基峰为m/z 57(叔丁基),次强峰为[M-CH3]~+峰。更多还原

【Abstract】 An unknown compound in petroleum aromatics was analyzed by Fourier transform ion cyclotron resonance mass spectrometry( FT- ICR MS) coupled with atmospheric pressure photoionization( APPI),electrospray ionization( ESI) and direct analysis in real time( DART) ionization. It was determined as tris( 2,4-di-tert-butylphenyl) phosphate( TDTBPP) by the accurate mass of FT- ICR MS and collision-activated dissociation( CAD). The characteristic spectra of TDTBPP in multiple ionization sources were demonstrated. The result indicated that the main mass peak in APPI was [M +H]+,and M. +was also present. The main mass peak in ESI was [M+Na]~+( without formic acid)or [M+NH4]~+( with formic acid),and the main mass peak in DART was [M+NH4]~+. APPI FT- ICR MS could be used to determine the polycyclic aromatic hydrocarbons( PAHs) with relatively higher molecular weight which could not be determined by gas chromatography- mass spectrometry.更多还原