A study on the extraction properties from aqueous phase to organic phase and the carrier-mediated transport at 25℃ in H2O-CHCL_3-H2O liquid membrane has been performed by using calix[4]arene derivatives (1～14)bearing a wide range of functional groups such as thio (seleno) ether, (benzothiazolyl) thioalkyl, pyridylalkoxy and thioalkyl. The results of liquid-liquid extraction and liquied membrane transport show that the calixarenes have nearly consistent selectivity for silver and mercury ions. All derivatives except calix[4]arenes substituted by (benzothiaxolyl) thioalkyl group (3～6) are efficient extractants and neutral carriers with high selectivity for silver. Calix [4]arenes substituted by pyridylalkoxy group (7～10) show high selectivity for lead in liquid-liquid extraction. The complexation studies reveal that the affinity toward Ag~+，Hg2~+, Pb2~+ is influenced by atom types and lipophilic groups at the lower rim of the caliarenes. The highest extraction and the fastest transport rates of silver are obtained by calix[4] arene substituted by thioalkoxy group (11～14). The transport rates increase with increasing concentration of the cations in the source phase and of the carrier in the CHCl2 phase. There is evidence that the carrier-mediated silver transport through bulk liquid membrane is a concentration gradient diffusion process.

Key words: HETEROATOM, CALIXARENE, DERIVATIVES, LIQUID-LIQUID EXTRACTION, LIQUID MEMBRANE, TRANSMISSION, SILVER