the interaction between metal ions and a carrier has been Specific interaction of N-octadecanoyl-N-phenylhydroxylamine evaluated by adsorption equilibrium studies (1-3) and sol-(ODPHA) and Ga 3/ was evaluated by means of the L-B techvent extraction (4).
nique. The monolayer of ODPHA on a subphase containing Ga 3/
The purpose of the present paper is to describe a new evaluaand/or Al 3/ was stable. Limiting areas of monolayer of ODPHA tion method for the interaction between metal ions and the on the subphases are increased with pH of the subphase and reach carrier at the interface between membrane and the aqueous constant values at certain pHs, 2.5 (on the Ga 3/ solution) and 4.5 phase. Langmuir-Blodgett (L-B) technique, first developed (on the Al 3/ solution), respectively. The surface pressure-area by Langmuir and Blodgett, is one of the most suitable techisotherm for ODPHA on the Ga 3/ /Al 3/ solution containing a 388nique to prepare ultrathin and uniform film and to evaluate fold amount of Al 3/ at pH 2.4 was similar to that for ODPHA on the Ga 3/ solution at the same pH. A microporous polymeric the interaction of membrane interface (5, 6). There have been membrane impregnating ODPHA showed a selective separation a large number of studies of the amphiphilic nature of L-B of Ga 3/ from a solution containing a 388-fold amount of Al 3/ films, and many studies of their applications in the various at pH 2.4. The separation factor toward Ga 3/ reached over 300. fields. In the present article, the selective interaction of Ga 3/