title: Ion-exchange behaviour of pyridinium tungstoarsenate.
abstract: The exchange behaviour of pyridinium tungstoarsenate has been investigated with some uni and bivalent cations. The compound shows high specificity towards Cs(+) and Ag(+) and the exchange is complete even in the low concentration range. The slopes of the isotherms of various cations are widely different suggesting that separation of these ions on a pyridinium tungstoarsenate column is feasible. From a linear plot of Barrer's equation, the thermodynamic equilibrium constant, the energy of interaction between the ions on the surface and the free energy change of the process have been evaluated.
authors.affiliation: Department of Chemistry, University of Roorkee, Roorkee, India.
authors.forename: W U
authors.initials: WU
authors.lastname: Malik
authors.forename: S K
authors.initials: SK
authors.lastname: Srivastava
authors.forename: S
authors.initials: S
authors.lastname: Kumar