Three types of direct current plasma ionization detectors (HeDCPID) for gas chromatography have been developed. When helium was used as both carrier and support gas and platinum was used as discharge electrodes, the analytical performance for the detection of H2, O2, Ar, N2, CH4, CO, CO2, etc. were investigated by examining the experimental parameters. Practical samples were analyzed and ionization mechanism of the detectors were discussed.

Key words: OXYGEN, GAS CHROMATOGRAPHY, CARBON DIOXIDE, NITROGEN, CARBON MONOXIDE, HYDROGEN, METHANE, PLASMAS, ARGON, ION DETECTOR