Contribution de la chromatographie en phase liquide à haute performance à la séparation des lanthanides trivalents sur résine cationique en présence d'edta : I. Synthèse et propriétés générales des résines pelliculaires polystyrène-divinylbenzǹe sulfonates

Abstract

High-performance liquid chromatographic separation of trivalent lanthanides on cationic exchanger with EDTA. I. Synthesis and general properties of polystyrene-divinylbenzene sulphonate pellicular ion exchangers The synthesis of pellicular ion exchangers by incomplete sulphonation of a styrene—divinylbenzene polymer following the method described by Hansen and Gilbert is controlled by scanning electron microscopy. The thickness of the ion-exchange shell is obtained by measuring the exchange capacity and the swelling due to the sulphonation. The exchange properties of homogeneous and thick-shell ion exchangers are similar if referred to the weight of exchanger. On the contrary, for thin shells, the behaviour seems to be that of a homogeneous ion exchanger of higher crosslinking.