Negative ion laser desorption ionization time-of-flight mass spectrometry of nitrated polycyclic aromatic hydrocarbons |
| |
Authors: | Dawit Z. Bezabeh Todd M. Allen Eileen M. McCauley Peter B. Kelly A. Daniel Jones |
| |
Affiliation: | 1. Department of Chemistry, University of California, USA, Davis, California 2. Facility for Advanced Instrumentation, University of California, Davis, California, USA
|
| |
Abstract: | 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. |
| |
Keywords: | |
本文献已被 ScienceDirect SpringerLink 等数据库收录! |
|