Speciation, Dissolution, and Redox Reactions of Chromium Relevant to Pretreatment and Separation of High-Level Tank Wastes | Zendy

P. Raics | Zendy; Linfeng Rao | Zendy; Sue B. Clark | Zendy; Nancy Hess | Zendy

Open Access

Speciation, Dissolution, and Redox Reactions of Chromium Relevant to Pretreatment and Separation of High-Level Tank Wastes

Author(s) -

P. Raics,

Linfeng Rao,

Sue B. Clark,

Nancy Hess

Publication year - 1999

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/833241

Subject(s) - chromium , dissolution , solubility , redox , alkalinity , chemistry , precipitation , aqueous solution , genetic algorithm , ionic bonding , ionic strength , environmental chemistry , inorganic chemistry , chemical engineering , ion , organic chemistry , physics , evolutionary biology , meteorology , engineering , biology

Pacific Northwest and Lawrence Berkeley National Laboratories, in collaboration with Washington State University, are developing fundamental data on the precipitation/dissolution reactions of Cr(III) compounds and the kinetics of oxidation of Cr(III) to Cr(VI) at room and elevated temperatures and under conditions relevant to high-level waste (HLW) processing. This integrated approach, which involves measuring solubility and oxidation rate constants and spectroscopic characterization of aqueous and solid species as a function of ionic strength, alkalinity, redox conditions, and temperature, will provide thermodynamic and kinetic data. These data are necessary to predict changes in chromium solubility and speciation in response to changes in pretreatment strategies or to develop cost-effective tank waste processing technologies that result from reducing the total amount of chromium in processed waste

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