1.l' invention relates to a process for the concentration and the separation of oxides of heavy isotopes of 1996. / p & & p & 2.procede characterizes in that: a) is added to the solution or to the flow of material at least one organic solvent miscible with water; b) is a cation exchanger acid, organic, in the form h, with a ppd protonates or biprotone and is then used as the solid phase; c) is placed in contact, continuous or discontinuous manner, the mixture of liquid coming from the step a) with the solid phase from the step b). / p & & p & 3.l' invention applies to the concentration of the isotopes of 1996.
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