Negative ion laser desorption ionization time-of-flight mass spectrometry of nitrated polycyclic aromatic hydrocarbons

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....

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Bibliographic Details
Published in:Journal of the American Society for Mass Spectrometry 1997-06, Vol.8 (6), p.630-636
Main Authors: Bezabeh, Dawit Z., Allen, Todd M., McCauley, Eileen M., Kelly, Peter B., Jones, A. Daniel
Format: Article
Language:English
Subjects:
Analysis methods
Applied sciences
Aromatic compounds
Atmospheric pollution
Chemistry
Desorption
Exact sciences and technology
Fragments
Ionization
Ions
Mass spectrometry
Mutagens
Organic chemistry
Pollutants
Pollution
Polycyclic aromatic hydrocarbons
Reactivity and mechanisms
Scientific imaging
Spectroscopy
Ultraviolet radiation
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Summary: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 NO 2 −, 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.
ISSN:1044-0305
1879-1123
DOI:10.1016/S1044-0305(97)00078-0