IEC 119 |
| Kenneth L. Nash, Melissa Hancock, Ivan Laszak, and Marian Borkowski. Chemistry Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439 |
| The behavior of Pu(IV) and Pu(VI) during alkaline permanganate leaching of 4 synthetic sludges (Bismuth Phosphate (B), Modified Bismuth Phosphate (M), Purex (P) and Redox (R)) has been investigated. The amount of Pu leached from the sludge increased in order P > R > B > M, in reverse order to the chromium leaching. The content of plutonium was independent of its initial oxidation state. The reverse trends can be understood in terms of Pu re-adsorption onto the MnO2 generated (as Cr(III) and other substrates are oxidized by permanganate/manganate). The effect of chelating agents known to be present in tank wastes (EDTA, gluconate, glycolate, oxalate and citrate) on KMnO4 reduction/MnO2 production and re-deposition of plutonium was also studied and found to have varied effects on the process of oxidative dissolution/Pu redeposition. The results will be reported with discussion of their potential impact on oxidative leaching of actual tank-waste sludge. Work performed under the auspices of the Environmental Management Science Program (EMSP) of the U.S. Department of Energy under contract number W-31-109-ENG-38 |
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Advanced Technologies for Decontaminating and Managing Radioactive Wastes
1:00 PM-5:00 PM, Tuesday, March 25, 2003 Convention Center -- Room 394, Oral
Division of Industrial and Engineering Chemistry |