ポリテトラフルオロエチレンフィルムによる水溶液中の無電荷金属錯体の濃縮

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タイトル別名
  • Concentration of metal ions in water as electrically neutral complexes on a polytetrafluoroethylene film.
  • ポリテトラフルオロエチレンフィルムによる水溶液中の無電荷金属錯体の農縮
  • ポリテトラフルオロエチレン フィルム ニ ヨル スイヨウエキチュウ ノ ム デ

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A PTFE-seal-tape of 20 cm long, 1.3 cm wide and 0.1 mm thick was placed on the surface of an aq. solution of 400 to 500 ml. Chloroform vapor was introduced into the solution and circulated in a closed system for 30 min. Then, the film was picked up and the solute held on it was eluted with CHCl3. As solutes, Hg(II), Pb(II), Ag(I) and Cd(II)-dithizonates and Co(II), Ni(II), Cd(II) and Zn(II)-PAN complexes were used (dithizone : diphenylthiocarbazone ; PAN : 1- (2-pyridylazo)-2-naphthol). For Cd(II) -PAN benzene vapor was circulated, and for Zn(II)-PAN, CHCl3 vapor was circulated for 1 h. Recoveries of metal dithizonates and PAN complexes were more than 80%. In an acidic solution, free dithizone is collected almost completely by the PTFE film, but can be removed from the film while keeping metal dithizonates on the film by circulating CHCl3 vapor in an alkaline solution. When air or carbon tetrachloride vapor was circulated, metal complexes were not collected by the PTFE film. The PTFE film surface is assumed to be covered with a thin layer of liquid CHCl3 upon circulating CHCl3 vapor in aq. solution. The present method is applicable to solutes with a large chloroform/water partition constant.

収録刊行物

  • 分析化学

    分析化学 42 (8), 479-484, 1993

    公益社団法人 日本分析化学会

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