高速かき混ぜ下における銅(II), マンガン(II), ニッケル(II)-1-(2-ピリジルアゾ)-2-ナフトール錯体の逆抽出速度に対する液液界面の影響

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タイトル別名
  • Influence of liquid-liquid interface on back-extraction kinetics of Cu(II), Mn(II) and Ni(II)-1-(pyridylazo)-2-naphthol complexes under high speed stirring.
  • 高速かき混ぜ下における銅（ＩＩ），マンガン（ＩＩ），ニッケル（ＩＩ）‐１‐（２‐ピリジルアゾ）‐２‐ナフトール錯体の逆抽出速度に対する液液界面の影響
  • コウソクカキマゼカ ニ オケル ドウ 2 マンガン 2 ニッケル 2

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抄録

The conditions of back-extraction factor for higher recoveries of heavy metals from alkaline liquid by the simultaneous forward and back-extraction method need to be considered. In this paper, back-extraction kinetics and the contribution of stirring are discussed. The metal complexes of Cu(II), Mn(II) and Ni(II) with 1-(2-pyridylazo)-2-naphthol (PAN) were investigated. EDTA or HNO3 solution was used as the back-extraction aqueous solvent. The reaction rate increased when interface area increased under highspeed stirring, indicating that interface significantly contributes to the reaction rate. In the present method, the reaction rate, Kobs, was divided into that in the bulk and at the interface. Rate constants for the ligand substitution reaction of Cu(II)-PAN and Mn(II)-PAN complex with EDTA in the bulk were determined to be 3.7 × 103 and 5.2 M-1 s-1, respectively. Rate constants for the dissociation reaction of Cu(II)-PAN, Mn(II)-PAN and Ni(II)-PAN complex in bulk were determined to be 4.5 × 102, 5.2 × 103 and 2.9 × 10_-1 M-1 s-1, respectively. The contribution of interface was more significant with HNO3 solution than with EDTA solution.

収録刊行物

  • 分析化学

    分析化学 45 (9), 851-857, 1996

    公益社団法人 日本分析化学会

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