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Synopsis : Polycyclic aromatic hydrocarbons (PAHs) were analyzed by gas chromatography/mass spectrometry (GC/MS) using electron ionization (El), positive ion chemical ionization (CI) and negative ion chemical ionization (N-CI) mass spectrometry. PAHs are major constituents of coal tar, and GC/MS technique is a useful analysis method for complex mixture of PAHs such as coal tar. El and Cl methods give similar sensitivities for each PAHs in reconstructed ion chromatograms (RIC). N-CI method gives different sensitivities in RIC for structural isomers and alkylside chain compounds. The results of GC/MS analysis of coal tar, RIC by El and N-CI method were quite different. It was confirmed that N-CI method is useful for analysis of PAHs mixture, because of good selectivity for PAHs structural isomers.

Analysis of Polycyclic Aromatic Hydrocarbons by Negative Ion Chemical Ionization Mass Spectrometry and its Application for Analysis of Coal Tar