Abstract
A new packing material of silica gel coated with polyamide crown resin was useful to separate anions but did not separate cations with water as eluent. It was shown by photoacoustic spectroscopy that the selectivity for cations was diminished because of hydrogen bond between silanol group on the silica gel surface and the crown ether of the polyamide crown resin. The elution volume of anion was dependent on the Gibbs free energy of hydration and the salt of a strongly hydrated anion eluted earlier than the salt of a weakly hydrated anion. The silica gel coated with the resin can be applied to chromatograph anions in environmental sample solutions and amino acids.
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