Carnahan, Jon W.
M.S. (Master of Science)
Department of Chemistry
Chromatographic analysis; Plasma chemistry
A 500 W microwave-induced helium plasma (MIP) is evaluated as an element-selective detector for packed column supercritical fluid chromatography (SFC). The background emission in the 200 to 600 nm spectral region is investigated with SFC mobile phases of pure carbon dioxide and binary carbon dioxide/methanol mixtures. In each case, molecular bands are identified. The chlorine emission line at 479.5 nm is selected. The analytical performance of the detector was evaluated by monitoring organochlorine compound eluted by SFC. Several mixtures were investigated and effects of the nature of the sample solvent was examined. Detection limit and sensitivities were dependent on the mass flow of carbon dioxide into the plasma torch. The separation efficiency for large, relatively nonvolatile organic compounds is assessed. High molecular weight compounds could be eluted with the binary mobile phases. Detection limits for chlorine ranged from 15 ng to 50 pg.
Wang, Yubang, "Studies of a moderate power microwave induced plasma with binary supercritical fluid chromatography mobile phases" (1992). Graduate Research Theses & Dissertations. 5099.
viii, 67 pages
Northern Illinois University
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