Complexometric 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 codisposed. A laboratory investigation was conducted on the effects of various complexing agents found in liquid and sol id oil shale wastes on the leachability of retorted shales. In batch experiments retorted shale samples were contacted with deionized-distilled water (DOW) and 10 different aqueous solutions of complexing agents. These agents included sodium-oxalate, ammonium-carbonate, sodium-thiosulfate, 2-pyri done, 2-hydroxy-6-methyl pyridine, potassium-thiocynate, acetonitrile, sodium-acetate, acetamide, and nicotinic acid. DOW leachate results were used as a baseline to compare with the results for aqueous complexometric leachates. Some of these agents aided in higher release of arsenic, boron, selenium, lead, and vanadium from the solids. The same complexing agents had different effects on different retorted shales, indicating that the results for one retorted shale mayor may not be representative of other retorted shales. This is due to differences in mineralogical residences of elements in various retorted shales and differences in leachate chemical systems of various retorted shales. Concentration of cadmiurn and cobalt did not exceed the quantitation limits of these elements in any of the leachates in this study.