Ionization of Gas-Phase Polycyclic Aromatic Hydrocarbons in Electrospray Ionization Coupled with Gas Chromatography
| Autor: | Han Bin Oh, Eun Sook Jeong, Sang Beom Han, Sangwon Cha, Eunju Cha, Sunghwan Kim, Jaeick Lee, Junghyun Son |
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| Rok vydání: | 2018 |
| Předmět: |
Analyte
Chromatography Chemistry Electrospray ionization 010401 analytical chemistry technology industry and agriculture Protonation 010501 environmental sciences Mass spectrometry 01 natural sciences 0104 chemical sciences Analytical Chemistry Gas phase Ion Ionization Gas chromatography 0105 earth and related environmental sciences |
| Zdroj: | Analytical Chemistry. 90:4203-4211 |
| ISSN: | 1520-6882 0003-2700 |
| DOI: | 10.1021/acs.analchem.8b00401 |
| Popis: | Herein, gas-phase polycyclic aromatic hydrocarbons (PAHs) as nonpolar compounds were ionized to protonated molecular ions [M + H]+ without radical cations and simultaneously analyzed using gas chromatography (GC)/electrospray ionization (ESI)-tandem mass spectrometry (MS/MS). The ionization profile, dissociation, and sensitivity were first investigated to understand the significant behavior of gas-phase PAHs under ESI. The formation of protonated molecular ions of PAHs was distinguished according to the analyte phase and ESI spray solvents. The protonated PAHs exhibited characteristic dissociations, such as H-loss, H2-loss, and acetylene-loss, via competition of internal energy. In addition, GC/ESI-MS/MS resulted in relatively lower concentration levels (better sensitivity) for the limits-of-detection (LODs) of PAHs than liquid chromatography (LC)/ESI-MS/MS, and it seems to result from the characteristic ionization mechanism of the gas-phase analyte under ESI. Furthermore, the LODs of gas-phase PAHs depen... |
| Databáze: | OpenAIRE |
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