Electromigration of carrier-free radionuclides |
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Authors: | F. Rösch R. Herrmann Tran Kim Hung M. Milanov V. A. Khalkin |
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Affiliation: | (1) Joint Institute for Nuclear Research, Dubna, USSR |
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Abstract: | Dependences of La(III) overall ion mobilities on concentrations of ox2– and tart2– anions of oxalic and tartaric acid in aqueous solutions of 0.01 overall ionic strength and temperature 298.1 K were obtained by direct measurements of electromigration of carrierfree140La-lanthanum(III). Concentration stability constants Kn and individual ion mobilities uio of oxalate and tartrate complexes of La(III) have been calculated for nitrate and perchlorate electrolytes, respectively: [La(ox)]+, lg K1=5.63(9), u0[La(ox)]+=1.95(15)·10–4 cm2·s–1·V–1; [la(ox)2]–, lg K2=4.05(19) u0[La(ox)2]–=–1.76(20)·10–4 cm2·s–1·V–1; [La(tart)]+, lg K1=4.40(5), u0[La(tart)]+=+1.99(18)·10–4 cm2·s–1·V–1.Results are compared with literature data. Additional, limiting individual La3+ ion mobility was calculated: =+6.9(1)·10–4 cm2·s–1·V–1 for pure water at 298.1 K. |
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