Extraction of Pb2+ with sodium dicarbollylcobaltate in the presence of 15-crown-5 |
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| Authors: | E Makrlík P Vaňura V Bečková |
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| Institution: | (1) Institute of Physical Engineering, University of West Bohemia, Veleslavínova 11, 301 14 Pilsen, Czech Republic;(2) Department of Analytical Chemistry, Prague Institute of Chemical Technology, Technická 5, 166 28 Prague, Czech Republic;(3) National Radiation Protection Institute,  robárova 48, 100 00 Prague, Czech Republic |
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| Abstract: | From extraction experiments with 22 Na as a tracer, the exchange extraction constant corresponding to the equilibrium Pb2+ (aq)+2 NaL+ (nb) PbL2
2+ (nb)+2 Na+ (aq) in the two-phase water-nitrobenzene system (L = 15-crown-5; aq = aqueous phase, nb = nitrobenzene phase) was evaluated as log Kex (Pb2+ , 2NaL+ ) = 4.7±0.1. Moreover, the stability constant of the complex PbL2
2+ in nitrobenzene saturated with water was calculated for a temperature of 25 °C as log  nb (PbL2
2+ ) = 17.9±0.1. |
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