Radioisotope studies of carboxyl sites on strong acid and strong base ion-exchange resins derived from polystyrene.
The pH-dependent distribution of carrier-free radioisotopes between aqueous phases at constant ionic strength and polystyrene-divinylbenzene type exchangers reveals the presence of a secondary exchange function attributable to carboxyl groups. Cation- and anion-exchangers of the sulphonate and quaternary ammonium types possess this additional cation-exchange capacity which is, however, relatively very low in currently available commercial resins. Its influence on separations involving radioisotopes of high specific activity is discussed.
Armitage
G M
GM
Chemical Laboratory, University of Kent at Canterbury, Canterbury, Kent, U.K.
Lyle
S J
SJ
Nair
V C
VC