Complex metric compounds found in oil shale wastes may have the ability to increase the release of trace elements from retorted oil shale when the solid and liquid wastes are co disposed. A laboratory investigation was conducted on the effects of various completing agents found in liquid and solid oil shale wastes on the leach ability of retorted shales. In batch experiments retorted shale samples were contacted with deionizer distilled water and 10 different aqueous solutions of completing agents. These agents included sodium-oxalate, ammonium carbonate, sodium thiosulfate, 2-pyridone, 2-hydorxy-6-methylpyridine, potassium thiocynate, acetonitrile, sodium acetate, acetamide, and nicotinic acid. DDW leachate results were used as a baseline to compare with the results for aqueous complexometric leachates.