接触及び誘発反応を応用した化学分析法-5-
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概要
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A solution containing a small amount of metal ions, e. g. Cu<SUP>+2</SUP>, Fe<SUP>+3</SUP>, Co<SUP>+2</SUP> or Ni<SUP>+2</SUP>, and a largeamount of Zn<SUP>+2</SUP> (or Cd<SUP>+2</SUP>) is treated with (NH<SUB>4</SUB>)<SUB>2</SUB>[Hg(CNS)<SUB>4</SUB>] reagent for precipitation of Zn [Hg(CNS)<SUB>4</SUB>] together with these metal ions by the induced precipitation. The precipitate shows a characteristic coloration and it turns to a characteristic colored solution by dissolving it in acetone-methanol (1:1) containing 10% NH<SUB>4</SUB>CNS, i. e. red-brown by the presence of Fe<SUP>+3</SUP>, greenish blue by the Co<SUP>+2</SUP> and red-brown by the Cu<SUP>+2</SUP>. 550γ of Fe<SUP>+3</SUP> or 5120γ of Co<SUP>+2</SUP> in 25200ml. of the sample solution may be determined by means of photometric measurement of the colored solution above mentioned. The determination of Cu<SUP>+2</SUP> is difficult due to the rapid discoloration. The conditions for obtaining the best induced precipitation, e. g. the amount of Zn<SUP>+2</SUP> to be added, the amount of precipitating agent against the definite volume of sample, and the stability of the colored solution to be tested are discussed. Also, the procedure for photometric estimation of a single ion and the interference are investigated. A satisfactory result is obtained for simultaneous estimation of Fe and Co in the solution.
- 社団法人 日本分析化学会の論文