A new PVC matrix supported liquid membrane transport system was proposed. By using a new selenium functionalized calix[4] arene as carrier, dioctyl phthalate as membrane solvent, the ion transport properties of the membrane were characterized. The formation constants of canier-metal ion complex were measured by potentiometry with two- layer sandwich membrane method. The correlation among the transport rate, complex formation constant and selective coefficients was studied. The fastest transport rate of mercury among eight metal ions was obtained by the selenium function calyx[4]arene. The molecular recognition of the calix[4]arene to metal ions and the mechanism of supported liquid membrane were discussed.

Key words: SELENIUM, calixarene, DIOCTYLTEREPHTHALATE, LIQUID MEMBRANE TECHNIQUES, SELECTIVITY