Aspects of the microwave induced plasma as an element selective detector for supercritical fluid chromatography and supercritical fluid extraction

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dc.contributor.authorDucatte, Gerald Rogeren
dc.contributor.committeechairLong, Gary L.en
dc.contributor.committeechairAnderson, Mark R.en
dc.contributor.committeememberMerola, Joseph S.en
dc.contributor.committeememberMcNair, Harold M.en
dc.contributor.committeememberTaylor, Larry T.en
dc.contributor.departmentChemistryen
dc.date.accessioned2014-03-14T21:20:46Zen
dc.date.adate2005-10-10en
dc.date.available2014-03-14T21:20:46Zen
dc.date.issued1993-12-05en
dc.date.rdate2005-10-10en
dc.date.sdate2005-10-10en
dc.description.abstractThe introduction of supercritical CO₂ at packed column supercritical fluid chromatography (SFC) flow rates is shown to significantly affect the excitation characteristics of a helium microwave induced plasma (He MIP). In this work, the influence of CO₂ on specific atomic and ionic transitions of Cl, Br, I, P, and S is described. Also presented is the determined relationship between transition energy and degree of signal depression resulting from the introduction of CO₂ to the plasma. Attempts to enhance the emission signals of non-metals by introducing H₂ into a He MIP are discussed. The inadequacy of excitation temperature, ionization temperature, rotational temperature, and electron number density measurements to determine the effect of CO₂ on the excitation characteristics of a He MIP is also described. However, application of kinetic theory and a recently developed theory on charge transfer allows a reasonable series of mechanisms to be developed that describe the excitation processes of a He MIP to which supercritical CO₂ is added. The remainder of this work describes a direct interface between a supercritical fluid extraction (SFE) vessel and an Ar MIP for the purpose of element selective detection. The response of the plasma to the introduction of sample via SFE at a variety of extraction temperatures, pressures, and sample concentrations is presented.en
dc.description.degreePh. D.en
dc.format.extentx, 105 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-10102005-131615en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10102005-131615/en
dc.identifier.urihttp://hdl.handle.net/10919/39732en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1993.D833.pdfen
dc.relation.isformatofOCLC# 30760478en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1993.D833en
dc.subject.lcshMicrowave plasmasen
dc.subject.lcshPlasma spectroscopyen
dc.subject.lcshSupercritical fluid chromatographyen
dc.subject.lcshSupercritical fluid extractionen
dc.titleAspects of the microwave induced plasma as an element selective detector for supercritical fluid chromatography and supercritical fluid extractionen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineChemistryen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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