Binding and release of various cations by polarization of polypyrrole based
exchange-resins has been studied. The reversibility of the process has bee
n investigated by electrochemical and nuclear techniques. It clearly depend
s on both the exchanged-cation and the sulfonated doping-ion. The selectivi
ty of the process has also been analyzed by binding experiments from a mixt
ure of two cations. (C) 2001 Elsevier Science B.V. All rights reserved.