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Technetium is a long-lived product of nuclear fission that readily forms the soluble pertechnetate anion [TcO 4 ] − . Green rusts (layered hydrous oxides containing both Fe(II) and Fe(III) and with interlayer sulfate or carbonate anions) concentrate >99.8% of 99 Tc, present as [TcO 4 ] − , from aqueous solution, even in the presence of high concentrations...
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