Comparison of SFC with HPLC and GC

With a FID (aflame ionization detector, which functions at atmospheric pressure) the restrictor is situated before the detector, while it is located after for detectors based upon UV-absorption, fluorescence or light diffusion. 

A large variety of normal phase HPLC columns (packed type) or GC columns (capillaries) are used. These two types of columns are complementary. For a packed column of HPLC type, the high flow rate of the supercritical mobile phase will render detection by FID or coupling with a mass spectrometer more difficult. Adding a modifier to the supercritical fluid would have the same effect. 

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