Temperature-programmed retention indices for g.c. and g.c.-m.s. analysis of coal- and petroleum-derived liquid fuels

摘要: Retention indices are very useful in identifying components liquid fuels by gas chromatography (g.c.), even when g.c. is coupled with mass spectrometry (g.c.-m.s.). In this work, temperature-programmed retention of over 150 compounds were determined on an intermediately polar capillary column coated 50% phenyl-50% methyl polysiloxane (Rtx-50) and a slightly 5% phenyl-95% (DB-5) at three heating rates (2, 4 6°C mint−1 from 40 to 310°C). Aliphatic give nearly constant different rates. However, the polycyclic aromatic exhibit relatively large temperature dependence. The use short isothermal hold (5 min) prior programmed heat-up did not cause any significant difference indices. polarity can affect significantly, depending compound type. differences between two columns small aliphatic but become larger compounds. general, their sensitivity programming decrease decreasing polarity. usefulness was also demonstrated analysis fuels. Combined spectra allows identification many more higher confidence petroleum- coal-derived JP-8 jet knowledge effects be applied for selecting appropriate programmes separation reliable given samples. addition, present results used combination spectral library accomplish faster identification.