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| Material Type: | Thesis/dissertation |
|---|---|
| Document Type: | Book |
| All Authors / Contributors: |
Maria Vita Di Giandomenico; Eric Simoni; Université de Paris-Sud. Faculté des Sciences d'Orsay (Essonne). |
| OCLC Number: | 494348106 |
| Description: | 1 vol. (X-120 p.) : ill. ; 30 cm. |
| Responsibility: | Maria Vita Di Giandomenico ; sous la direction de [Eric Simoni]. |
Abstract:
Because of protactinium tendency to polymerisation, hydrolysis and sorption on all solid supports, the equilibria constants relative to monomer species were determined at tracer scale (ca 10-12 M) with 233 isotope. The complexation constants of protactinium (V) and sulphate ions were calculated starting from a systematic study of the apparent distribution coefficient D in the aqueous system thenoyltrifluoracetone/toluene/sodium sulphate/perchloric acid//sodium perchlorate and as function of ionic strength, temperature, free sulphate, protons and chelatant concentration. Parallely, the structural study of protactinium(V) was performed using 231 isotope. XANES and EXAFS spectra show unambiguously the absence of the trans dioxo bond that characterizes the other early actinide elements like uranium and neptunium. In concentrated sulphuric acid (12 and 4 M), protactinium(V) is proved to exhibit a single oxo bond. In 0,5 M and 0,05 M HF medium, the results indicate the absence of any oxo bond: protactinium(V) exists in the form of a pure fluoro-complex.
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Related Subjects:(9)
- Thénoyltrifluoroacétone -- Thèses et écrits académiques.
- Complexation -- Thèses et écrits académiques.
- Ions -- Thèses et écrits académiques.
- Protactinium -- Thèses et écrits académiques.
- Spectrométrie XANES -- Thèses et écrits académiques.
- Coefficient de partage (chimie) -- Thèses et écrits académiques.
- Extraction liquide-liquide
- Ions sulfate
- TIS
