Polymer-Mediated Extraction for Microplate Reader Spectrophotometric Determination of ppb-Level Copper(II) Ion in Water

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A negatively charged metal chelate, bis(bathocuproinedisulfonic acid)-copper(I), was formed and stably solubilized in an aqueous solution of a water-soluble polymer, poly(N-isopropylacrylamide) (PNIPAAm), at room temperature. When the solution was warmed at 40°C, PNIPAAm became water-insoluble. It then formed a gum-like aggregate (polymer phase) having a very small volume. The chelate was difficult to be extracted to the polymer phase in the absence of counter ions, but was efficiently incorporated when appropriate amounts of quaternary ammonium ion are present as the counter ions. The recovery of the chelate increased with increasing the concentration or the hydrophobic properties of the counter ions, indicating the ion-pair extraction of the charged chelate into the polymer phase. In the presence of 1 mM dodecyltrimethylammonium chloride, the recovery of the chelate was quantitative. After the polymer phase was dissolved by 1-propanol in the hole of a 96-hole microplate, the absorbance at 450 nm of copper(I) chelate was measured. A slightly curved calibration was obtained in the copper(II) concentration range from 5×10-9 M to 5×10-7 M. The standard deviation was 6% (n=5) for 5×10-8 M copper(II) ions.

収録刊行物

  • Analytical sciences : the international journal of the Japan Society for Analytical Chemistry  

    Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 14(5), 929-933, 1998-10-10 

    社団法人 日本分析化学会

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各種コード

  • NII論文ID(NAID)
    10002417267
  • NII書誌ID(NCID)
    AA10500785
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    09106340
  • NDL 記事登録ID
    4576990
  • NDL 雑誌分類
    ZP4(科学技術--化学・化学工業--分析化学)
  • NDL 請求記号
    Z54-F482
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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