水酸化ジルコニウム共沈法による海水中のカドミウムのく形波ポーラログラフ定量

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  • Square-wave polarographic determination of cadmium in seawater by means of coprecipitation with zirconium hydroxide.
  • スイサンカ ジルコニウム キョウチンホウ ニ ヨル カイスイチュウ ノ カドミ

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The square-wave polarographic determination of Cd in seawater by coprecipitation with zirconium hydoxide was carried out. A square-wave polarograph system consisting of Shimadzu type PR-50 and Shimadzu type SWP-50 was used and the anode was a mercury pool in electrolytic cell. Zirconium oxychloride containing 30 mg of Zr is added to 2000 ml of seawater and pH is adjusted to 8.2 with aqueous ammonia (1:2). The precititate is separated by filtration and then dissolved in 25 ml of 4 M hydrochoric acid. The solution is diluted to 50 ml with distilled water. A portion of this solution is submitted to the polarographic determination. The polarogram is recorded over the range from -0.40 V to -0.80 V vs. Hg-pool. The results are as follows: (1) Cd in seawater can be coprecipitated quantitatively when the pH is adjusted to 8.2. (2) Cd concentration determined by this method is 1.38 ppb. (3) Effect of various kinds of foreign ions is examined. As(III) Fe(III) and Bi(III) ions interfer with the polarographic determination of Cd remarkably.

収録刊行物

  • 分析化学

    分析化学 36 (6), 367-370, 1987

    公益社団法人 日本分析化学会

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