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Evaluation of a Demountable Tangential Flow Torch for Microwave-Induced Plasma Atomic Emission Spectrometry

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Abstract:

A demountable torch for the microwave-induced plasma that utilizes a tangential flow pattern is described. This new torch is compared to a conventional all-quartz design in a series of comparative studies. Diagnostic studies consist of measurements of electron number densities, excitation temperatures, and ionization temperatures of an argon plasma generated in each torch. Hydrodynamic flow measurements, vertical emission profiles, and limits of detection provide further contrast between the characteristics of the demountable design and conventional all-quartz torch. The compatibility of the new torch design with supercritical CO2 flows is demonstrated where the MIP is coupled with a packed-column supercritical fluid chromatograph for the purpose of element-specific detection. The physical advantages of the demountable torch over the all-quartz design are discussed.

Keywords: MIP; Microwave-induced plasma; SFC; Supercritical fluid chromatography; Torch design

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702934415246

Affiliations: 1: Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0212; current address: DuPont Chemicals, Jackson Laboratory, Chamber Works, Deepwater, NJ 08023 2: Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0212 3: Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0212; Analysis Branch, Phillips Research Center, Phillips Petroleum Company, Bartlesville, OK 74004

Publication date: July 1, 1993

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