SOLVENT IMPREGNATED RESINS CONTAINING DI-(2-ETHYLHEXYL) PHOSPHORIC-ACID .1. PREPARATION AND STUDY OF THE RETENTION AND DISTRIBUTION OF THE EXTRACTANT ON THE RESIN

Solvent impregnated resins (SIR) containing di-(2-ethylhexyl)-phosphoric acid (DEHPA) were prepared by adsorption of the organophosphorous extractant into Amberlite XAD2 polymeric macroporous adsorbent. Extractant adsorption on the polymer was studied as a function of both the nature of the organic solution and the extractant concentration used. The retention and interactions of the extractant on the polymeric matrix was studied by FTIR spectroscopy. The distribution of DEHPA between the aqueous phase and resin phase was determined as a function of both pH and loading of the organophosphorous extractant on the resin. The distribution ratio of the organophosphorous compound was obtained after determining phosphorous by coupled plasma atomic emission spectroscopy. The data have been analyzed numerically by the program LETAGROP-DISTR, in order to determine the distribution constant K(D), the aggregation constant K(n) and the acidity constant K(a).