Chemiluminescence determination of cobalt(II) with 1,10-phenanthroline in presence of surfactants.

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  • WATANABE Kunihiro
    Department of Industrial Chemistry,Faculty of Science and Technology,Science University of Tokyo
  • YAMASAKI Tuyoshi
    Department of Industrial Chemistry,Faculty of Science and Technology,Science University of Tokyo
  • ITAGAKI Masayuki
    Department of Industrial Chemistry,Faculty of Science and Technology,Science University of Tokyo

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Other Title
  • 界面活性剤共存下における１，１０‐フェナントロリンを用いるコバルト（ＩＩ）の化学発光定量
  • カイメン カッセイザイ キョウゾンカ ニ オケル 1 10 フェナントロリン
  • 界面活性剤共存下における1,10-フェナントロリンを用いるコバルト(II)の化学発光定量

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Abstract

The micellar enhanced chemiluminescence method using 1, 10-phenanthroline to determine small amounts of cobalt(II) was investigated by the flow injection method. The proposed flow system is comprised of three flow lines for cobalt(II), 1, 10-phenanthroline and hydrogen peroxide, respectively. The effects of cationic surfactant micelles with cetyltrimethylammonium bromide (CTAB), zephiramine (Zeph), cetylpyridium bromide (CPB), etc. upon the chemiluminescence (CL) determination of cobalt(II) are described. Among the examined cationic surfactants, CTAB provided the highest enhancement, with a CL intensity approximately 110 times higher than that in the absence of surfactant. The authors also investigated the mechanism of CL-enhancement by spectrophotometry and fluorometry. The role of the micelle was revealed through the 3D spectra of cobalt(II)-phenanthroline complex formation, that is, the micelle enhanced the rate of chelate reaction by concentrating Co ion as the anionic species. The formed cobalt(II) chelate was concentrated into micelles.As a result, the concentration of cobalt(II)chelate decreased to 67% in aqueous phase. The high fluorescence intensity of 3, 3'-diformy1-2, 2'-dipyridyl produced by the cobalt(II)-catalyzed oxidation of 1, 10-phenanthroline with hydrogen peroxide was measured. It was found that the intensity of the fluorescence was enhanced 1.4 times in the presence of CTAB. The limits for the determination of cobalt(II)were 5.0 ppb (20μl sample injection) and 1.0 ppb (continuous sample flow at a sample feed speed of 0.8 ml/min) under the optimum conditions.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 45 (10), 897-902, 1996

    The Japan Society for Analytical Chemistry

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