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Solvent Extraction and Ion Exchange Volume 31, 2013 - Issue 7
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Original Articles

The Radiation Chemistry of CMPO: Part 1. Gamma Radiolysis

Bruce J. Mincher Aqueous Separations and Radiochemistry Department, Idaho National Laboratory, Idaho Falls, ID, USACorrespondence[email protected]
,
Stephen P. Mezyk Department of Chemistry and Biochemistry, California State University at Long Beach, Long Beach, CA, USA
,
Gracy Elias Chemistry and Radiation Measurements Department, Idaho National Laboratory, Idaho Falls, ID, USA
,
Gary S. Groenewold Chemistry and Radiation Measurements Department, Idaho National Laboratory, Idaho Falls, ID, USA
,
Catherine L. Riddle Aqueous Separations and Radiochemistry Department, Idaho National Laboratory, Idaho Falls, ID, USA
&
Lonnie G. Olson Aqueous Separations and Radiochemistry Department, Idaho National Laboratory, Idaho Falls, ID, USA
Pages 715-730 | Published online: 27 Sep 2013
 
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Abstract

Octylphenyl-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) was irradiated using 60Co γ-rays, and post-irradiation samples were analyzed for the decrease in CMPO concentration, the appearance of degradation products, and the effects on americium solvent extraction. The –G-value for the radiolytic degradation of CMPO depends on the presence of nitric acid and oxygen during irradiation, with both providing protection from radiolytic degradation. The –G-value does not depend on the γ-ray dose rate or the CMPO concentration. Effects on solvent extraction performance were independent of the change in CMPO concentration, but rather related to the nature of the degradation products. The main products were identified by ESI-MS and were different for irradiation in the presence of nitric acid.

ACKNOWLEDGMENTS

This work was supported under a DOE-NEUP grant and Fuel Cycle R&D programmatic funding, both under Idaho Operations Contract DE-AC07-05ID14517.

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