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Abstract
Gas chromotography/electron capture negative ion chemical ionization mass spectrometry is shown to be a very sensitive and selective determination method for nitrated polycyclic aromatic hydrocarbons (PAH). The detection limit was 1 pg injected to the GC column using single ion monitoring. The mass spectra are characterized by an intense molecular ion, the base peak in all spectra. The second most abundant ions were (M - 16)/sup -/ and (M - 30)/sup -/ for mono- and dinitro-PAH, respectively. The NO/sub 2//sup -/ ion (m/z 46) is observed in most spectra. There are few differences in the mass spectra of various isomeric compounds. The pressure and the temperature in the ion source had little influence on the mass spectra and sensitivity within the limits tested. The method is demonstrated on a synthetic mixture containing nitro-PAH, and on a toluene extract of a formerly commercial carbon black. The application to urban air particulate extracts is discussed. 4 figures, 4 tables.
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