2004 Volume 90 Issue 2 Pages 92-97
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 alkyl-side 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.
