Plutonium Speciation in Support of Oxidative-Leaching Demonstration Test

Sinkov, Sergey I.

Pacific Northwest National Laboratory (U.S.)

关键词: Leaching;    Radioactive Waste Processing;    Oxidation;    Manganese;    Leachates;   

DOI  :  10.2172/919717
RP-ID  :  PNNL-16844
RP-ID  :  AC05-76RL01830
RP-ID  :  919717

美国|英语

来源: UNT Digital Library

【 摘 要 】

Bechtel National, Inc. (BNI) is evaluating the plutonium speciation in caustic solutions that reasonably represent the process streams from the oxidative-leaching demonstration test. Battelle—Pacific Northwest Division (PNWD) was contracted to develop a spectrophotometric method to measure plutonium speciation at submicromolar (< 10-6 M) concentrations in alkaline solutions in the presence of chromate and carbonate. Data obtained from the testing will be used to identify the oxidation state of Pu(IV), Pu(V), and Pu(VI) species, which potentially could exist in caustic leachates. Work was initially conducted under contract number 24590-101-TSA-W000-00004 satisfying the needs defined in Appendix C of the Research and Technology Plan TSS A-219 to evaluate the speciation of chromium, plutonium, and manganese before and after oxidative leaching. In February 2007, the contract mechanism was switched to Pacific Northwest National Laboratory (PNNL) Operating Contract MOA: 24590-QL-HC9-WA49-00001.