Abstract − Analytical Sciences, 19(8), 1211 (2003).
Analysis of Sorption into Single ODS-Silica Gel Microparticles in Acetonitrile-Water
Kiyoharu NAKATANI and Hiroshi KAKIZAKI
Department of Chemistry, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba 305-8571, Japan
Intraparticle mass transfer processes of Phenol Blue (PB) in single octadecylsilyl (ODS)-silica gel microparticles in acetonitrile-water were analyzed by microcapillary manipulation and microabsorption methods. An absorption maximum of PB, the sorption isotherm parameters, and the sorption rate in the microparticle system were highly dependent on the percentage of acetonitrile in solution. The results are discussed in terms of the microscopic polarity surrounding PB in the ODS phase and the relationship between the isotherm parameters and the sorption rate.
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