| Abstract: | ![]()
A multidimensional LC-GC-MS system was developed and used to analyze complex fossil-fuel samples. The electron-acceptor stationary phase, 5 μm 2,4-dinitrophenylmercaptopropylsilica, was packed into a 0.32-mm × 350-mm microcapillary liquid chromatography (μLC) column. Aromatic fractions eluted from the μLC system at 12 μL/min and were diverted to the gas chromatograph mass spectrometer (GC-MS) by a ten-port switching valve with 50 and 7.6-μL loops. Concurrent cosolvent evaporation occurred in a 0.32-mm × 3-m precolumn ahead of a 0.25-mm × 30-m DB-5 analytical column. Solvent vapors exited through an open-split interface. The utility of the μLC-GC-MS system was demonstrated through the analyses of solvent refined coal, kerosene, and crude oil. |
