The liquid membrane transport rate of Na+, K+ and Rb+ was studied in chloroform with 2,3-benzo-11-methyl-18-crown-6, 2,3-benzo-8,15-dimethyl-18-crown-6 and 2,3-benzo-8,11,15-trimethyl-18-crown-6 as ion carriers. The results show that the transport rate increases with increasing crown concentration and the relationship between them is linear, but decreases when no. of Me group in the ring of crowns increase. For the identical crown, the magnitude of transport rate of different metal ions and those of stability constants of corresponding complexes have the same sequence. The crown transport metal ions with accompanying anions and the stronger the hydration ability of anions, the less the transport rate. The relationship between transport rate and stirring rate is linear.

Key words: SODIUM ION, COMPLEX COMPOUNDS, CROWN ETHER COMPOUNDS, BENZENE P, CHLOROFORM, LIQUID MEMBRANE, CALCIUM ION, REACTION RATE, ION CONCENTRATION, DIFFUSION PROCESSES