Flotation-Spectrophotometric Determination of Mercury in Water Samples Using Iodide and Ferroin

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This paper describes a simple and highly selective method for separation, preconcentration and spectrophotometric determination of trace amounts of mercury. The method is based on the flotation of an ion-associate of HgI<sub>4</sub><sup>2-</sup> and ferroin between aqueous and <i>n</i>-heptane interface at pH 5. The ion-associate was then separated and dissolved in acetonitrile to measure its absorbance. Quantitative flotation of the ion-associate was achieved when the volume of the water sample containing Hg(II) was varied over 50 - 800 ml. Beer’s law was obeyed over the concentration range of 3.2 × 10<sup>-8</sup> - 9.5 × 10<sup>-7</sup> mol l<sup>-1</sup> with an apparent molar absorptivity of 1 × 10<sup>6</sup> l mol<sup>-1</sup> cm<sup>-1</sup> for a 500 ml aliquot of the water sample. The detection limit (<i>n</i> = 25) was 6.2 × 10<sup>-9</sup> mol l<sup>-1</sup>, and the RSD (<i>n</i> = 5) for 3.19 × 10<sup>-7</sup> mol l<sup>-1</sup> of Hg(II) was 1.9%. A notable advantage of the method is that the determination of Hg(II) is free from the interference of the almost all cations and anions found in the environmental and waste water samples. The determination of Hg(II) in tap, synthetic waste, and seawater samples was carried out by the present method and a well-established method of extraction with dithizone. The results were satisfactorily comparable so that the applicability of the proposed method was confirmed in encountering with real samples.

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 20(10), 1449-1452, 2004-10-10

    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)
    10013657587
  • 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
    7111449
  • 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  NDL  J-STAGE 
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