| Autor: |
Bezabeh, Dawit Z., Allen, Todd M., McCauley, Eileen M., Kelly, Peter B., Jones, A. Daniel |
| Zdroj: |
Journal of the American Society for Mass Spectrometry; June 1997, Vol. 8 Issue: 6 p630-636, 7p |
| Abstrakt: |
Nitrated polycyclic aromatic hydrocarbons (nitro-PAHs) are widespread environmental pollutants that are generated by incomplete combustion and by atmospheric transformation of polycyclic aromatic hydrocarbons (PAHs). Many nitro-PAH compounds are potent genotoxins and some are direct acting mutagens. Detection of nitro-PAHs in aerosols is complicated by small sample sizes and nitro-PAH abundances that are 1–2 orders of magnitude less than analogous unsubstituted PAHs. Selective detection of several nitro-PAHs by using laser desorption ionization time-of-flight mass spectrometry in negative ion mode has been achieved. Desorption and ionization of nitro-PAHs were effected by using pulsed UV radiation at 266 and 213 ran. Intense molecular anions were observed in addition to fragments identified as CN-and NO2-, which were characteristic indicators of the presence of nitro-PAHs. Selective detection of nitro-PAHs in negative ion mode was demonstrated in the analysis of a diesel particulate sample. |
| Databáze: |
Supplemental Index |
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