2,2'-ビピリジル-鉄(II)キレートによる水銀(II)の溶媒抽出吸光光度定量法

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タイトル別名
  • Spectrophotometric determination of mercury(II) by solvent extraction with 2, 2'-bipyridyliron(II) chelate
  • 2 , 2 -ビピリジル-テツ II キレート ニ ヨル スイギン II ノ ヨウバイ チュウシュツ キュウコウ コウド テイリョウホウ
  • 金属キレート陽イオンによる陰イオンの溶媒抽出吸光光度定量法(第21報)

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説明

A spectrophotometric method for the determination of mercury(II), based on a solvent extraction of the associated ion pairs formed between 2, 2'-bipyridyliron(II) chelate cations and bromo-mercury(II) complex anions, is described.<BR>The best extractant is 1, 2-dichloroethane, whereas other organic solvents are useless in this system. The absorbance maximum of 2, 2'-bipyridyl-iron (II) chelate in the organic phase is at 526 mμ.<BR>The recommended procedure for the calibration curve is as follows.<BR>Five milliliters of potassium bromide (1 M ), varying amounts of standard mercury(II) solution (25 μg Hg2+ /ml, 010 ml), 1 ml of acetate buffer solution (1 M, pH 4.5) and 5 ml of 2, 2'-bipyridyl-iron(II) solution (5 × 10-3 M) are mixed. This solution is diluted to 25 ml with distilled water, and shaken for 3 min. with 10.0 ml of 1, 2-dichloroethane. The absorbance of the organic phase is measured at 526 mμ against the solvent.<BR>The percentage of the extraction is determined to be 82% (19°C) by radiochemical technique using Hg197. Beer's law is obeyed over the range of 110 μg/ml of mercury(II).<BR>Several features of the proposed method are as follows: A good extraction is obtained in the wide range of pH (210), the reagent employed is readily available in pure form, and the solution remains stable over a long period of storage. The method is convenient, accurate and highly selective for the determination of a small amount of mercury(II).

収録刊行物

  • 分析化学

    分析化学 16 (9), 931-936, 1967

    公益社団法人 日本分析化学会

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