Abstract
Chemical ionization of polycyclic aromatic hydrocarbons (PAHs) with three different reactants, diethylether, dimethylcarbonate and tetrahydrofuran, has been used to differentiate PAH isomers. The mechanisms of formation of the molecular ion, the protonated molecular ion and adducts have been elucidated in order to optimize the analytical diagnosis from the measurement of the relative abundances of ions observed on the PAH's chemical ionization mass spectra. As a practical application, chrysene and triphenylene have been determined quantitatively in a diesel exhaust particles sample.
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