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High-voltage Spark Atomic Emission Detector for Gas Chromatography

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Abstract:

A de-powered, double-gap, miniature nanosecond spark source for emission spectrochemical analysis of gas chromatographic effluents is described. The spark is formed between two thoriated tungsten electrodes by the discharge of a coaxial capacitor. The spark detector is coupled to the gas chromatograph by a heated transfer line. The gas chromatographic effluent is introduced into the heated spark chamber where atomization and excitation of the effluent occurs upon breakdown of the analytical gap. A microcomputer-controlled data acquisition system allows the implementation of time-resolution techniques to distinguish between the analyte emission and the background continuum produced by the spark discharge. Multiple sparks are computer averaged to improve the signal-to-noise ratio. The application of the spark detector for element-selective detection of metals and nonmetals is reported.

Keywords: Element-specific detector; Emission spectroscopy; Gas chromatography; Spark discharge emission source; Spark, AC; Time-resolved spectroscopy

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702824639646

Affiliations: 1: Department of Chemistry, Michigan State University, East Lansing, Michigan 48824; present address: Shell Development Co., P.O. Box 1380, Houston, TX 77001 2: Department of Chemistry, Michigan State University, East Lansing, Michigan 48824; present address: Nalco Chemical Co., 6216 West 86th Place, Chicago, IL 60536 3: Department of Chemistry, Michigan State University, East Lansing, Michigan 48824

Publication date: July 1, 1982

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