Extraction of Pb2+ with sodium dicarbollylcobaltate in the presence of 15-crown-5

Authors
Makrlik, E Vanura, P Beckova, V
Citation
E. Makrlik et al., Extraction of Pb2+ with sodium dicarbollylcobaltate in the presence of 15-crown-5, J RAD NUCL, 247(3), 2001, pp. 549-551
Citations number
12
Categorie Soggetti
Inorganic & Nuclear Chemistry
Journal title
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
ISSN journal
02365731 → ACNP
Volume
247
Issue
3
Year of publication
2001
Pages
549 - 551
Database
ISI
SICI code
0236-5731(200103)247:3<549:EOPWSD>2.0.ZU;2-H
Abstract
From extraction experiments with Na-22 as a tracer, the exchange extraction constant corresponding to the equilibrium Pb2+(aq)+2 NaL+(nb)reversible ar row PbL22+(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 K-ex(Pb2+, 2NaL(+)) = 4.7 +/-0.1. Moreover, the stability constant of the complex PbL22+ in nitrobenzene saturated with water was calculated for a te mperature of 25 degreesC as log beta (nb)(PbL22+) = 17.9 +/-0.1.