Hydrophobic cyclic polyether, decyl-l8-crown-6 (D18C6), is well known to have a selective uptake ability for strontium (II) . Calcium alginate microcapsule (MC) containing D 18C6 was fabricated for the efficient separation of strontium (II) from concentrated nitric acid solution. In this study, hybrid MCs containing D18C6 and sodium lauryl benzenesulfonate (Na-LBS) were prepared, and distribution coefficient, Kd, was improved to be over 80 cm3/g by using them. MCs were also prepared by using nitric acid and divalent metal ions, and the effect on Kdvalues was examined. The optimum condition was applied to the continuous column separation.