The influence of humic acid on the adsorption of europium onto inorganic colloids as a function of pH

Comparison of complexed species of Eu in alumina-bound and free polyacrylic acid: A spectroscopic study

“…The parameters obtained from the fitting are given in Table 2. The peak at R+∆R = 3.9Å can be completely reproduced by the multiple scattering paths [5][6][7]. N o Eu-Eu interaction needs to be considered in the fit, although its presence cannot be excluded because its scattering contribution is weak in the explored k range (see reference compound and theoretical considerations).…”

“…The speciation of Eu (total coordination number, number of carboxylate groups and water molecules bound, distances, coordination mode) was characterized in this study using 7 F 0 → 5 D 0 excitation spectra [20,21] triacetate, potassium bromide 99%, and polyacrylic acid at 5000Da (Aldrich) were used as received. The proton exchange capacity of PAA amounts to 11.3±0.4 meq/g [19].…”

“…The interaction depends on the chemical state of the organic material, which can be soluble or associated to mineral particles. Numerous studies on the interaction of actinides with HS in solution are described in the literature [1][2][3][4], but few studies have been devoted to the interaction of actinides with HS-mineral complexes [5][6][7][8][9][10][11][12][13].…”

“…Experimental conditions were chosen to selectively study the interaction between Eu and adsorbed PAA in the ternary system, i.e. without considering the interaction of Eu with aluminol surface sites [7].…”

“…Structural parameters were obtained from 7 coordination. The results show that the degree of freedom of carboxylate groups is not the same for free or adsorbed PAA.…”