FPEX gamma-Radiolysis in the Presence of Nitric Acid
Abstract: The solvent formulation known as FPEX (Fission Product Extraction) contains calix[4]arene-bis-(tert-octylbenzo-crown-6) (BOBCalixC6) for Cs extraction; 4,4’,(5’)-di-(t-butyldicyclohexano)-18-crown-6 (DtBuCH18C6) for Sr extraction; 1-(2,2,3,3,-tetrafluoropropoxy)-3-(4-sec-butylphenoxy)-2-propanol (Cs-7SB) modifier and trioctylamine (TOA) to aid in Cs stripping, all in Isopar L diluent. This formulation has favorable extraction efficiency for Cs and Sr from acidic solution, and was investigated here for ?-radiation stability. When FPEX was irradiated in contact with aqueous nitric acid, extraction efficiency decreased only slightly when irradiated to absorbed doses as high as 200 kGy. The color of the organic phase changed to a deep yellow-orange, and several new peaks related to radiolysis of the Cs-7SB modifier were detected by GC-ECD analysis. This had little effect on solvent extraction distribution ratios. Possible reasons for this unexpected robustness under conditions of high radiation and acidity are discussed.
- Research Organization:
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Sponsoring Organization:
- DOE - NE
- DOE Contract Number:
- DE-AC07-99ID-13727
- OSTI ID:
- 917073
- Report Number(s):
- INL/JOU-07-12327; SEIEDB; TRN: US0804426
- Journal Information:
- Solvent Extraction and Ion Exchange, Vol. 25, Issue 5; ISSN 0736-6299
- Country of Publication:
- United States
- Language:
- English
Similar Records
Development of a novel solvent for the simultaneous separation of strontium and cesium from dissolved Spent Nuclear Fuel solutions
Caustic-Side Solvent Extraction: Chemical and Physical Properties of the Optimized Solvent