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The complexation of Eu(III) with Polyacrylic acid (PAA) and alumina-bound polyacrylic acid (PAA-Al 2 O 3 ) was studied at pH 5 in 0.1 M NaClO 4 . The experiments were carried out for two polyelectrolytes at 5000 Da and 50000 Da. The quantitative description of the interaction of Eu and PAA showed the formation of a 1:1 Eu:PAA complex and the existence of similar binding modes ("sites") of Eu with both polymers. Interaction studies of Eu(III) with alumina-bound PAA particles were carried out in conditions where their overall surface charge were equal to 0. The description of the data indicated the existence of a similar site in binary and ternary systems for high Eu loading. For low Eu loading, the existence of a new site on PAA-Al 2 O 3  particles resulting from the PAA-Al 2 O 3  interaction was suggested.

Complexation studies of Eu(III) with polyacrylic acid either free in solution or adsorbed onto alumina