Simultaneous determination of Hg(II)-Ag(I)-Cd(II) by conductometric titration using the formation of ternary complex

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Other Title
  • 三元錯体の生成反応を利用した電導度滴定法による水銀（ＩＩ）‐銀（Ｉ）‐カドミウム（ＩＩ）の同時定量
  • サンゲン サクタイ ノ セイセイ ハンノウ オ リヨウシタ デンドウド テキテ
  • 三元錯体の生成反応を利用した電導度滴定法による水銀(II)-銀(I)-カドミウム(II)の同時定量

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Description

A conductometric determination of Hg(II), Ag(I) and Cd(II) was carried out by using the insoluble ternary complex formation of the metal ions with iodide ion in the presence of 1, 10-phenanthroline(phen). Recommended procedure is as follows; An aliquot of sample solution containing (1429) mg of Hg(II), (816) mg of Ag(I), and (917)mg of Cd(II) transfered into a 100 ml beaker. Add to acetate buffer and stoichiometric amounts of phen (40 % ethanol-water solution). Amounts of nitrate ion which was estimated separately by other titration with 0.1 M Ag(phen)2 complex (40 % ethanol-water solution) are adjusted in the range of (4.06.0)mM. The sample solution is titrated with 0.1 M KI standard solution at the rate of 0.20 ml/min or less. The titration curve showed three end-points corresponding to the formation of (1) Hg(phen)2I2, (2) Ag(phen) I, and (3) Cd(phen)2I2. The relative standard deviation was less than 0.8 %, when the pH value was controlled at 4.04.5 (acetate buffer) and the nitrate concentration was adjusted in the range of (4.06.0)mM. The effect of diverse ions on the determination was also investigated in detail.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 28 (12), 748-753, 1979

    The Japan Society for Analytical Chemistry

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