Yubang Wang

Publication Date

1992

Document Type

Dissertation/Thesis

First Advisor

Carnahan, Jon W.

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Chemistry

LCSH

Chromatographic analysis; Plasma chemistry

Abstract

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.

Comments

Includes bibliographical references (pages 65-67)

Extent

viii, 67 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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