radiation chemical behavior of actinides in extraction systems. III. Pu(IV) Precipitates from gamma -irradiated 30% tbp + n-dodecane

Journal Article · Tue Jul 01 04:00:00 EDT 1986 · Sov. Radiochem. (Engl. Transl.); (United States)

OSTI ID:7158833

Vladimirova, M V; Boikova, I A; Fedoseev, D A; Teterin, E G

Spectrophotometric, gravimetric, and ..gamma..-spectrometric analyses, together with solubility and IR methods, were used to investigate the composition and structure, as well as the conditions and behavior in various polar and low-polarity solvents, of Pu(IV) precipitates formed in the ..gamma..-irradiated system 30% TBP + n-dodecane. It was found that the formation of precipitates in solutions containing Pu(IV) in the range 4.10/sup -3/ to 2.10/sup -2/ M occurs at an absorbed ..gamma..-radiation doses E..gamma.. in the range 2.10/sup 5/ to 2.6.10/sup 6/ Gy. At the same time the molar ratio of DBPA (formed by the ..gamma..-radiolysis of TBP) to metal lies in the range 3-5. In the given range of values of E..gamma.. effectively all the plutonium passes into the precipitate. The precipitates form a gelatinous mass. 30-50 wt. % of which consists of the mother liquor. The plutonium content amounts to 11-14 wt. %. The molar ratios of DBPA and MBPA to plutonium (nD and nM, respectively) in precipitates formed at values of E..gamma.. in the range 7.0.10/sup 5/ to 2.6.10/sup 6/ Gy are 2.9 +/- 0.5 and 0.5 +/0.1, respectively. Analyses of the IR spectra of washed and unwashed precipitates indicate the presence of hydrogen-bonded DMPA, carbonyl compounds (butyraldehyde or the anhydride), and NO/sub 3//sup -/ ions in precipitates washed with n-dodecane and the absence of these components in precipitates washed with ethanol. On the basis of the experimental data assumptions are made about the composition of the precipitates formed at doses E..gamma.. in the range 2.10/sup 5/ to 2.6.10/sup 6/ Gy.

• OSTI ID: 7158833
• Journal Information: Sov. Radiochem. (Engl. Transl.); (United States), Journal Name: Sov. Radiochem. (Engl. Transl.); (United States) Vol. 27:5; ISSN SVRDA
• Country of Publication: United States
• Language: English

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ACTINIDES
ALKANES
BUTYL PHOSPHATES
CHEMICAL ANALYSIS
CHEMICAL PROPERTIES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
DODECANE
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY SOURCES
ESTERS
EXTRACTION
FUELS
GAMMA RADIATION
GAMMA SPECTRA
GRAVIMETRIC ANALYSIS
HYDROCARBONS
INFRARED SPECTRA
IONIZING RADIATIONS
MATERIALS
MBP
METALS
NUCLEAR FUELS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
ORGANIC SOLVENTS
PHOSPHORIC ACID ESTERS
PLUTONIUM
PRECIPITATION
QUANTITATIVE CHEMICAL ANALYSIS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADIOLYSIS
REACTOR MATERIALS
SEPARATION PROCESSES
SOLUBILITY
SOLVENT EXTRACTION
SOLVENTS
SPECTRA
SPECTROPHOTOMETRY
TBP
TRANSURANIUM ELEMENTS
VALENCE