Synthesis of silica-gel immobilized 8-quinolinol using 1-ethoxycarbonyl-2-ethoxy-1,2-dihydroquinoline and 4-aminobenzoic acid and its application to a column preconcentration/determination of trace vanadium in water by ICP-AES.

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  • KASAHARA Issei
    Department of Environmental Biology and Chemistry, Faculty of Science, Toyama University
  • TAKAYAMA Noriko
    Department of Environmental Biology and Chemistry, Faculty of Science, Toyama University
  • YAMAMOTO Hiromi
    Department of Environmental Biology and Chemistry, Faculty of Science, Toyama University
  • SAKURAI Kazuhide
    Department of Environmental Biology and Chemistry, Faculty of Science, Toyama University
  • TAGUCHI Shigeru
    Department of Environmental Biology and Chemistry, Faculty of Science, Toyama University

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Other Title
  • １‐エトキシカルボニル‐２‐エトキシ‐１，２‐ジヒドロキノリンと４‐アミノ安息香酸を用いる８‐キノリノール結合型シリカゲルの合成とカラム濃縮／誘導結合プラズマ発光分析法による水中の微量バナジウムの定量
  • 1 エトキシカルボニル 2 エトキシ 1 2 ジヒドロキノリン ト 4 アミノ
  • 1-エトキシカルボニル-2-エトキシ-1,2-ジヒドロキノリンと4-アミノ安息香酸を用いる8-キノリノール結合型シリカゲルの合成とカラム濃縮/誘導結合プラズマ発光分析法による水中の微量バナジウムの定量

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Abstract

An improved synthetic method for silica-gel immobilized 8-quinolinol is proposed. An aminopropylated silica-gel was reacted with 4-aminobenzoic acid in the presence of 1-ethoxycarbony1-2-ethoxy-1, 2-dihydroquinoline (EEDQ) to synthesize aminobenzamide silica-gel. The product was diazotized with sodium nitrite and coupled with 8-quinolinol by the usual method. EEDQ is easy to handle, since it is stable, less toxic and does not require critical pH control in the synthesis reaction. The synthetic method was simplified and made certain. The adsorbent prepared by using EEDQ was compared with that prepared by a reported method using 4-nitro-benzoyl chloride and sodium dithionite, the other one was synthesized by a Mannich reaction. The silica-gel immobilized 8-quinolinol synthesized by an improved method was applied to the determination of a trace amount of vanadium in river, snow and bottled drinking water samples by ICP-AES after preconcentration. Vanadium (V) and vanadium (IV) were adsorbed quantitatively within the pH range 3.0 to 7.5 and 4.0 to 6.5, respectively. It was possible to determine sub μgl-1 levels of vanadium after a 100-fold preconcentration using synthesized silica-gel immobilized 8-quinolinol.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 46 (3), 211-215, 1997

    The Japan Society for Analytical Chemistry

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