The direct introduction of supercritical fluid chromatography effluent from a packed DeltaBond 300 phenyl column with the MIP as an elemental detector, using a high efficiency TM<sub>010</sub> cavity, has been employed for SFC separations. A toroidal plasma is sustained in the cavity by using an ICP type torch and an argon auxiliary flow (2 L/min) over all pressures (1500-5000 psi). Methanol modifier concentrations (0-5%) have also been studied. Studies of the effects of CO<sub>2</sub> on excitation temperature, electron number density, and analyte emission signals are presented. In addition, the background broad-hand emission signal with 100% CO<sub>2</sub> and a methanol modifier up to 5% are presented.

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