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Simultaneous Determination of C, H, N, O, F, Cl, Br, and S in Gas Chromatographic Effluent by Fourier Transform Red/Near-Infrared Atomic Emission Spectroscopy

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A high-powered, atmospheric-pressure, helium microwave-induced plasma (MIP) is used as the interface between a gas chromatograph (GC) and a Fourier transform near-infrared (FT-NIR) emission spectrometer. By the collection of a series of time-resolved interferograms when organic compounds elute from the GC into the plasma, a complete account of both spectral and chromatographic activity is recorded. Computer-generated, element-specific chromatographic reconstructions for each of eight different nonmetals are obtained from a single injection of a chemical mixture. Atomic emission intensity vs. chromatographic retention time is plotted for each of eight or more optical frequencies chosen from the 15,700-7900 cm−1 region. The frequencies are preselected to coincide with spectral lines of C, H, N, O, F, Cl, Br, and S emitting from the helium MIP. This unique GC/MIP/FT-NIR emission spectrometer provides simultaneous multielement-specific chromatographic detection of a variety of nonmetals important to synthetic organic chemistry.

Keywords: Bromine; Carbon; Chlorine; Elemental analysis; Emission spectroscopy; Fluorine; Fourier transform red/near-infrared spectroscopy; Gas chromatography; Hydrogen; Interferometry; Microwave-induced plasma; Nitrogen; Nonmetals; Organic elemental analysis; Oxygen; Simultaneous multielemental analysis; Sulfur; multielemental analysis

Document Type: Research Article


Affiliations: Department of Chemistry, Willard Hall, Kansas State University, Manhattan, Kansas 66506

Publication date: March 1, 1986

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