Method for preparing a monolithic support on which uranyl cations are immobilised, and associated methods for capture and recovery

A method for preparing, in an internal volume of at least one channel of a miniaturised analytical system, a monolithic support on which UO22+ cations are immobilised, which method comprises the following successive steps (a) to (e) of:

• (a) activating the inner surface of the channel(s);
• (b) introducing a polymerisation solution for synthesising a monolithic support into the internal volume of the channel(s), the polymerisation solution comprising:
• a monomer comprising a phosphate group,
• at least one crosslinking agent
• several solvents, and
• a radical polymerisation initiator;
• (c) polymerising the polymerisation solution obtained in step (b), whereby a monolithic support anchored onto the walls of the channel(s) is obtained;
• (d) rinsing the monolithic support obtained in step (c);
• and
• (e) contacting the rinsed monolithic support obtained in step (d) with a solution comprising UO22+ cations, whereby a monolithic support on which the UO22+ cations are immobilized is obtained.