Journal
RADIOCHIMICA ACTA
Volume 97, Issue 3, Pages 161-165Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1524/ract.2009.1590
Keywords
Astatine; Diisopropylether; Extraction; Nitric acid
Funding
- Canceropole du Grand Ouest
- European Project TARCC
- Agence nationale de la Recherche [ANR-06-JCJC-0035]
- Agence Nationale de la Recherche (ANR) [ANR-06-JCJC-0035] Funding Source: Agence Nationale de la Recherche (ANR)
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The extracting mechanism of astatine-211 in diisopropylether (DIPE) is studied by analyzing the effect of the nature of the aqueous solution and organic solvent of the distribution coefficients characterizing the ratio of organic and aqueous concentration of astatine (D). On the one hand, at a given pH value, D was shown to be independant of the nature and concentration of the counter-ion present in the aqueous solution (Cl-, ClO4-, NO3-). On the other hand the nature of the organic solvent had a strong effect. D increases as the polarity of the organic solvent increases. these experimental observations are explained by the solvation of astatine by the organic solvent. The back-extraction of astatine from the organic to the aqueous phase is efficient in basic conditions. This is explained by the formation of a hydrolyzed species of astatine presenting no affinity for DIPE. Hydrolysis constants of astatine are deuced from experimental data (log beta(1) = -3.0 +/- 0.1 and log beta(2) = -14.2 +/- 0.1).
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