Extraction of americium by diphosphine dioxides
The extraction of americium(III) from nitric acid solutions with six diphosphine dioxides in the series R/sub 2/P(O)CH/sub 2/(O)PR/sub 2/--R/sub 2/P(O)CH/sub 2/(O)PPh/sub 2/--Ph/sub 2/P(O)(CH/sub 2/)/sub n/(O)PPh/sub 2/ (n = 1-3) was investigated. The distribution coefficients are the highest (100 at an extraction reagent concentration of 0.01 M and acidity 1 M) for tetraphenyl dioxide. It was found that in the region of low acidities, the dioxides form disolvates AmS/sub 2/(NO/sub 3/)/sub 3/ with Am, and at high acidities then form acidocomplexes HpMe(NO/sub 3/)/sub 3+p/ . 2S. The concentration and effective constants of extraction were determined. Their high value and the large chelating effect are evidence of a bidentate coordination of the dioxides to Am. It was shown that lengthening of the alkylene bridge of tetraphenyl dioxide leads to a large reduction of the extraction capacity. It was found that when the electronegativity of the substituents is increased (replacement of alkyl groups by phenyls), the extraction capacity of the dioxides relative to americium increases. Causes of this anomaly are discussed.
- OSTI ID:
- 7273460
- Journal Information:
- Sov. Radiochem. (Engl. Transl.); (United States), Journal Name: Sov. Radiochem. (Engl. Transl.); (United States) Vol. 17:2; ISSN SVRDA
- Country of Publication:
- United States
- Language:
- English
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