Highly Sensitive Determination of Aromatic Molecules in the Interface Region of an Oil/Water System Using Laser Two-Photon Ionization

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  • レーザー多光子イオン化法を用いる油／水界面の芳香族分子の高感度分析
  • レーザー タコウシ イオンカホウ オ モチイル アブラ ミズ カイメン ノ ホウコウゾク ブンシ ノ コウカンド ブンセキ

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Abstract

A laser multi-photon ionization technique has been applied to an interface region in two-phase systems (n -octane/water). The Laser irradiated the interface under total reflection condition from the oil phase, and the photo-ionization signal was caused by water region. Pyrene stayed at the oil/water interface, and the amount of Pyrenesulfonic acid at the interface was very small. Other aromatic molecules, naphthalene derivatives and benzene derivatives, were also applied to this technique. The pH and the surfactant dependence also exhibited that the non-ionic molecules stayed at the oil/water interface. Upon lower the pH, the protonated aromatic molecules increased and overall dissolving process decelerated. With increasing the anionic and cationic surfactant concentrations, the photo-ionization current gradually decreased. The surfactant and aromatic molecules formed into micelles in the bulk water region. Photo-ionization is a potential tool for investigating the phenomena of a two-phase system.<br>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 54 (6), 467-471, 2005

    The Japan Society for Analytical Chemistry

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