Add time:09/30/2019         Source:infona.pl

The equilibrium extraction behavior of Sm(III), Eu(III) and Dy(III) from aqueous NaClO 4 solutions in the pH range of 4-9 at 0.1 M ionic strength into organic solutions of 1-Nitroso-2-naphthol (cas 131-91-9) (HA) and 1,10-phenanthroline (Phen) has been studied. The equilibrium concentrations of Eu were assayed through the 344 keV photopeak of the 1 5 2 Eu radiotracer used. The concentrations of Sm and Dy were measured by irradiating one mL portions of the organic extract and analyzing the 104 and 108 keV photopeaks of the short-lived neutron activation products, 1 5 5 Sm and 1 6 5 m Dy, respectively. Quantitative extraction of Eu with 5 10 - 2 M HA alone was obtained in the pH range of 6.7-7.8 with n-butanol, 7.4-8.5 with chloroform, 8.0-8.7 with ethyl acetate, 7.7-8.5 with isoamyl alcohol and 6.1-8.0 with methyl isobutyl ketone (MIBK). But, Eu was extracted only to a maximum of 78% and 83% in the pH range of 8.3-8.9 and 7.4-8.1 with carbon tetrachloride and xylene, respectively. The extraction of Sm and Dy were found quantitative in the pH range of 6.3-7.0 and 6.6-7.1, respectively, with 5 10 - 2 M HA alone in MIBK solutions. The synergistic extraction of Eu was quantitative in the pH range of 6.6-9.8 with chloroform, 7.8-8.9 with ethyl acetate, 7.7-8.5 with isoamyl alcohol and 6.0-9.6 with MIBK when 1 10 - 2 M each of HA and Phen were employed. Sm and Dy were quantitatively extracted into MIBK solutions containing 5 10 - 2 M each of HA and Phen in the pH range 6.0-7.5 and 6.1-7.5, respectively. The distribution ratios of these lanthanides (Ln) were determined as a function of pH, and HA and Phen concentrations. The analysis of the data suggests that these Ln are extracted as LnA 3 chelates when HA alone is used. In the presence of HA and Phen, both LnA 3 (Phen) and LnA 3 (Phen) 2 adducts are formed only in the MIBK system while LnA 3 (Phen) complexes are the predominant ones in all other solvent systems studied. The extraction constants and the adduct formation constants of these complexes have been calculated.

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