Analytical Sciences

The Liquid-Liquid Extraction Using Hydrophilic Solvents Occluded to an Oil-Adsorbent as an Organic Phase: Extraction of 8-Quinolinolato Complexes of Alkaline Earth Metals into Tetrahydrofuran

Kaoru FUJINAGA, Setsuko SUITOU, Yasushi SEIKE, and Minoru OKUMURA

Department of Material Science, Faculty of Science and Engineering, Shimane University, 1060 Nishikawatsu, Matsue 690-8504, Japan

In order to use a hydrophilic solvent as an organic phase in liquid-liquid extraction by retaining it to a solid support, the occlusion and desorption of nine hydrophilic solvents, such as methanol, to three kinds of commercially available oil-adsorbent were examined. The combination of tetrahydrofuran and WOSEP made by fibrous polypropylene was finally selected, and was subjected to the extraction of alkaline earth metals with 8-quinolinol. It was proved that Mg²⁺, Ca²⁺, and Sr²⁺ ions could be successfully extracted into the tetrahydrofuran phase in the form of 8-quinolinolato complexes, which could not be extracted into CHCl₃.

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