THERMOCHEMICAL STUDY OF COMPLEX-FORMATION IN CHELATING ION-EXCHANGE RESINS

The process of sorption of transition metal ions from nitrate solution s onto chelating ion-exchange resins containing amino, phosphonic and aminophosphonic acid groups has been studied with the help of a Calvet microcalorimeter. Direct calorimetric measurements were performed at different degrees of exchange and the enthalpy variations for the syst em were obtained. In this work it is shown what the Irving-Williams ru le holds for amino groups containing AS resin. In the case of phosphon ic acid groups containing KRF resin, the Delta H of sorption of the tr ansition metal ions depends on the Cartledge ionic potential.