Preparation of Sheath Flow-type Atomic Emission Detector with Face-to-face Coaxial Electrodes for Oxygen-selective Detection by Gas Chromatography

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  • MIKUNI Takeru
    Graduate School of Industrial Technology, Nihon University
  • SAITOH Kazunori
    Department of Applied Molecular Chemistry, College of Industrial Technology, Nihon University
  • NAKAGAMA Tatsuro
    Department of Applied Molecular Chemistry, College of Industrial Technology, Nihon University

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Other Title
  • ガスクロマトグラフィーによる酸素の選択的検出を目的とした対向同軸電極を備えたシースフロー型原子発光検出器の試作
  • ガスクロマトグラフィー ニ ヨル サンソ ノ センタクテキ ケンシュツ オ モクテキ ト シタ タイコウ ドウジク デンキョク オ ソナエタ シースフローカタ ゲンシ ハッコウ ケンシュツキ ノ シサク

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Abstract

An atomic emission detection (AED) device with face-to-face coaxial electrodes using a helium radio-frequency plasma (RFP) for gas chromatography (GC) was prepared. The plasma generation unit was constructed by coaxcially positioning face-to-face two platinum tubular electrodes (2.0 mm o.d. and 1.0 mm o.d.). Moreover, in order to prevent contamination of the atmosphere, a structure in which the circumference of the quartz discharge tube was enclosed by helium (sheath flow structure) was adopted. The head of an optical fiber was placed on the AED device, and the end was connected to a spectrometer. The prepared AED device was set on a conventional GC for the measurement. When tert-butyl methyl ether was used as an oxygen-containing compound, the atomic emission wavelength due to oxygen was possible to be detected. When the detection wavelength, applied power, applied frequency and flow-rate of the make-up gas were set at 309.0 nm, 3 W, 250 kHz and 5 mL min−1, respectively, the detection limit as the amount of oxygen was obtained to be 42 pg s−1 (3 σ). It would be applied to high-sensitive measurements of oxygen-containing compounds in petroleum products and oxidized compounds.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 61 (8), 679-684, 2012

    The Japan Society for Analytical Chemistry

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