クロロホルム蒸気通気による水溶液中の疎水性溶質のポリテトラフルオロエチレンフィルム表面への濃縮

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タイトル別名
  • Concentration of hydrophobic solutes in water on polytetrafluoroethylene film by circulating chloroform vapor in closed system.
  • クロロホルム ジョウキ ツウキ ニ ヨル スイヨウエキチュウ ノ ソスイセイ

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抄録

A new method to collect hydrophobic solutes dissolved in water on the surface of polytetrafluoroethylene (Teflon) film is proposed. A test-tube (2.8 cm i.d.×25 cm) containing 10 ml of chloroform and a cylindrical separatory funnel (6.5 cm i.d., 600 ml capacity) containing 500 ml of aq. sample solution were connected together with a Viton diaphragm airpump. A Teflon-seal-tape of suitable length (0.1 mm thick, 1.3 cm wide) was placed on the water surface. The chloroform vapor generated by bubbling air was dispersed through the aq. phase via a sintered glass ball and circulated in the closed system. The aq. phase was saturated with chloroform without any excess chloroform in the liquid state. After one- to two-hour circulation of the chloroform vapor, the aq. solution was drained out of the separatory funnel and a 5 ml portion of chloroform was poured into the funnel to rinse the film left and the glassware wall. As hydrophobic solutes, Fe(III)-8-hydroxyquinolate, Ni(II)-dimethyl-glyoximate, naphthalene, anthracene and naphthacene were examined. Recoveries of Fe(III)-8-hydroxy-quinolate were quite satisfactory : 89 and 96% were recovered by using a 10 and a 20 cm length of film, respectively, after one-hour circulation of chloroform vapor. The recovery of Ni(II)-dimethylglyoximate was unsatisfactory : only 32 and 62% were recovered by using a 10 cm length of film, after one- and two-hour circulation, respectively. For this solute, however, successive extraction can be applied to improve the recovery. By using a 40 cm length of film, 89% of the anthracene and 92 % of the naphthacene were recoverd after 1.5-and one-hour circulation, respectively. In the case of naphthacene, 83 % was recoverd from the 40 cm long film and the glassware by circulating air, instead of chloroform vapor, for 0.5 h. The recovery of naphthalene was quite unsatisfactory because of its high volatility. The mechanism of the present concentration method may be similar to that of conventional solvent extraction: chloroform molecules, being supplied continuously to the aq. solution, cover the surface of the Teflon film and the glassware to form a thin organic solvent layer which takes part in the partition of hydrophobic solutes. Solutes were found to be concentrated on the part of the glassware in contact with the top surface of the sample solution. The Teflon material to be used for the present purpose should be such that it floats in water.

収録刊行物

  • 分析化学

    分析化学 39 (4), 239-244, 1990

    公益社団法人 日本分析化学会

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