Real-Time Quantitative Analysis of Combustion-Generated Polycyclic Aromatic Hydrocarbons by Resonance-Enhanced Multiphoton Ionization Time-of-Flight Mass Spectrometry

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• 作者：Christopher M. Gittins ; Marco J. Castaldi ; Selim M. Senkan ; and Eric A. Rohlfing
• 刊名：Analytical Chemistry
• 出版年：1997
• 出版时间：February 1, 1997
• 年：1997
• 卷：69
• 期：3
• 页码：286 - 293
• 全文大小：162K
• 年卷期：v.69,no.3(February 1, 1997)
• ISSN：1520-6882

文摘

We have combined resonance-enhanced multiphotonionization (REMPI) time-of-flight mass spectrometry withon-line flame sampling to determine the centerline concentrations of naphthalene, fluorene, and anthracene ina pure methane + oxygen/argon (1:5) diffusion flame.Naphthalene concentrations between 100 parts perbillionby volume (ppbV) and 6 parts per million by volume(ppmV) and fluorene concentrations below 50 ppbV aredetermined using one-color REMPI on jet-cooled samplesextracted from the flame; anthracene concentrations inthe 5-40 ppbV range are determined using two-colorREMPI. The REMPI ion signals are converted toabsoluteconcentrations in real time by performing gas-phasestandard additions to the flame sample.Isomer-selectivedetection of larger polycyclic aromatic hydrocarbons, suchas perylene and benzo[a]pyrene, is possibleusing the two-color REMPI approach.