Transport of UO22+ as its anionic thiocyanate complex [UO2(SCN)(4)](2-) across a bulk liquid membrane using is Crown 6(18C6) and Dibenzo 18 Crown 6 (DB18C6) as carriers in the membrane phase has been studied. The anionic complex is formed by the addition of KSCN to the feed solution at a pH of 1. A dilute acid (pH = 5) served as the stripping: agent in the receiving compartment. The interference from Th(IV) and a few other cations could be eliminated by using EDTA as a masking agent in the feed solution. Various factors influencing the transport process have been studied and an uphill transport (>89%) of UO22+ from the feed solution could be accomplished under optimum conditions.