Massoud Fattahi, L. Vichot, Frédéric Poineau, Chantal Houée‐Levin, Bernd Grambow,
Abstract Speciation of Tc in aqueous solution is a complex phenomenon because several parameters intervene simultaneously. We show under gamma radiations, it is completely modified. At pH 8.5 TcO 2 is oxidized to Tc(VII) with a yield of 1.38×10 −7 mol J −1 . At pH 1.5, it was demonstrated that Tc is present as hydroxylated species Tc n O y (4n-2y)+ (L. Vichot, M. Fattahi, M. Musikas: Radiochim. Acta 91, 263 (2003)). Its oxidation leads also to Tc(VII) with an experimental yield of 1.45×10 −7 mol J −1 . In ...
Tópico(s): Nuclear Materials and Properties
2005 - R. Oldenbourg Verlag | Radiochimica Acta
Pascal Le Goff, Ph. Guétat, L. Vichot, Nadine Leconte, Pierre‐Marie Badot, Frédéric Gaucheron, M. Fromm,
Tritium is the radioactive isotope of hydrogen. It can be integrated into most biological molecules. Even though its radiotoxicity is weak, the effects of tritium can be increased following concentration in critical compartments of living organisms. For a better understanding of tritium circulation in the environment and to highlight transfer constants between compartments, we studied the tritiation of different agricultural matrices chronically exposed to tritium. Milk is one of the most frequently ...
Tópico(s): Astrophysics and Cosmic Phenomena
2015 - Elsevier BV | Journal of Environmental Radioactivity
Xiaolan Liu, Frédéric Poineau, Massoud Fattahi, Bernd Grambow, L. Vichot,
Summary A method for speciation of Tc(IV) species (TcCl 6 2− and TcCl 5 (H 2 O) − ) in chloride solutions, using capillary electrophoresis (CE) technique was developed. The proposed method has overcome the difficulties of unstable oxidation states analysis by shortening their travel time in the capillary. TcCl 6 2− and TcCl 5 (H 2 O) − were thus separated without being hydrolyzed and polymerized, and their UV/Vis spectra were recorded. With a 1 M HCl/NaCl buffer solution (pH=1), the electrophoretic mobilities ...
Tópico(s): Chemical Synthesis and Characterization
2005 - R. Oldenbourg Verlag | Radiochimica Acta