Trace Analysis of Cobalt and Manganese in Organic Solvents by Flow-Injection Chemiluminescence Method Utilizing Reverse Micelle

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  • Takahashi Hideyuki
    Department of Chemistry, Graduate School of Science, Hiroshima University
  • Urabe Yasuaki
    Department of Chemistry, Graduate School of Science, Hiroshima University
  • Okamoto Yasuaki
    Department of Chemistry, Graduate School of Science, Hiroshima University
  • Tsukahara Satoshi
    Department of Chemistry, Graduate School of Science, Hiroshima University
  • Fujiwara Terufumi
    Department of Chemistry, Graduate School of Science, Hiroshima University

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Other Title
  • 逆ミセルを用いるフローインジェクション化学発光検出による有機溶媒中のコバルトとマンガンの微量定量法
  • ギャクミセル オ モチイル フローインジェクション カガク ハッコウ ケンシュツ ニ ヨル ユウキ ヨウバイ チュウ ノ コバルト ト マンガン ノ ビリョウ テイリョウホウ

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Abstract

The use of a reversed micellar medium of cetyltrimethylammonium chloride (CTAC) in 1-hexanol-cyclohexane has been examined for the flow-injection (FI) determination of cobalt and manganese in organic solvents using the chemiluminescence (CL) reaction of luminol. The FI procedure used simply involves the mixing of a cobalt(II) acetate or manganese(II) acetate solution with luminol in a reversed micellar solution of CTAC in 1-hexanol-cyclohexane (1 : 25 v/v)/water (0.08 mol dm−3 sodium hydroxide). When mixed with a reversed micellar luminol reagent, either metal acetate caused a pronounced enhancement in the CL emission. An increase in the CL emission was produced by the addition of sodium carbonate to an aqueous phase containing luminol at a relatively lower sodium hydroxide concentration of 0.02 mol dm−3 dispersed in the reversed micellar solution. When the mole fraction of 1-hexanol in the bulk solvent was increased, a decline in the CL intensity was observed beyond a mole fraction of 0.042. For the cobalt and manganese determinations using 1-hexanol-cyclohexane as a solvent in the sample solutions, the optimum conditions were evaluated, and detection limits of 0.1 and 0.5 ng dm−3, respectively, were achieved. The calibration graphs obtained for cobalt and manganese were linear with dynamic ranges from 0.01 to 10 and 0.01 to 20 μg dm−3, respectively. The present FI-CL method was suitable for the determination of trace cobalt and manganese in various organic solvents.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 58 (6), 523-529, 2009

    The Japan Society for Analytical Chemistry

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