UPTAKE OF METAL-IONS BY A NEW CHELATING ION-EXCHANGE RESIN .8. SIMULTANEOUS UPTAKE OF CATIONIC AND ANIONIC SPECIES

The uptake of tri-, tetra- and hexa-valent actinides as well as of per technetate actions by some new multifunctional ion exchange resins has been investigated. The new resins, identified as Diphonix A, for anio nic Diphonix, contain the same geminally substituted diphosphonic acid groups bonded to a styrenic-based polymer matrix as the regular Dipho nix resin, plus strong base anion exchange groups such as the tetraalk ylammonium (Diphonix A - Type 1 resins) or the quaternized pyridinium (Diphonix A - Type 2 resins) groups. Our uptake measurements have show n that the Type 2 Diphonix A resins are as effective as the regular Di phonix resin in the rapid uptake of actinides from acidic solutions, w hile at the same time sorbing pertechnetate anions in a manner compara ble to existing commercial anion exchange resins. The failure of the T ype 1 Diphonix A resins to perform equally well has been explained as a consequence of the mutual interaction of adjacent diphosphonic acid groups and tetraalkylammonium groups. Uptake data have also been obtai ned with Se(IV). The behavior of the Diphonix A resins toward Se(IV) u ptake in acidic solutions is comparable to that of commercial anion ex change resins.