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Frédéric Poineau, Massoud Fattahi, Bernd Grambow

Photochemical behaviour of Tc₂OCl₁₀^4– and Tc_nO_y^4n–2y+ in chloride media

Keywords: Technetium, Polymer, Photochemistry, Speciation

The stabilities of the technetium polymers Tc₂OCl₁₀^4- and Tc_nO_y^4n-2y+ have been studied under light irradiation in 3 M chloride media with a pH range from 0 to 1.3. It has been shown that under irradiation, Tc₂OCl₁₀^4- is not stable and undergoes dissociation to TcCl₅(H₂O)^- at pH=0 and pH=0.3. At pH=1, irradiation of Tc₂OCl₁₀^4- leads to a stationary state involving TcCl₅(H₂O)^- and Tc₂OCl₁₀^4-. At pH=1.3, Tc_nO_y^{4n-2 y+} remains stable under irradiation. Under light irradiation, the predominance diagram of Tc(IV) species obtained from Tc₂OCl₁₀^4- aquation in a pH range from 0 to 1 is drawn.
The chemical behaviour of Tc₂OCl₁₀^4- and the influence of the light on the condensation of Tc(IV) and solubility of TcO₂· x H₂O are discussed.

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 94, 02/2006
Pages: 091 - 095

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