8-Hydroxy quinoline was used successfully as a carrier for the transport of molybdenum across a bulk liquid membrane of chloroform. The pH of the feed solution was adjusted to 5.5. A mixture of 0.1-M nitric acid and 0.2-M hydrogen peroxide served as receiving phase for the maximum transport of the metal ion. Under the optimized experimental conditions, 80% of molybdenum was transported across the membrane in 5 hr and the value increased to 95% in 24 hr. Addition of 1,10 phenanthroline to the feed solution had a synergistic effect and caused a pronounced acceleration of the transport, while the effect of Dibenzo 18 crown 6 was insignificant. The transport of molybdenum was made selective by the addition of suitable masking agents to the feed solution. Most of the common interfering metal ions were masked by the addition of EDTA. The interference from tungsten was eliminated with citrate and the co-transport of uranium was minimized by the addition of ammonium carbonate to the feed solution.