SORPTION BEHAVIOR OF PERTECHNETATE ON REILLEXTM-HPQ ANION-EXCHANGE RESIN FROM NITRIC-ACID SOLUTION

The distribution coefficients are reported for (TcO4-)-Tc-99 on the nitrate form of Reillex(TM)-HPQ anion exchange resin. The nitric acid concentration was varied from 10.0 M to 9.80 x 10(-4) M at 20-degrees-C with a nominal pertechnetate loading of <0.03 mole % resin. Equilibrium was attained in 30 minutes or less. K(d)' is defined as: [GRAPHICS] The values at 10.0, 5.00, and 1.00 M HNO3 are 11.5, 55.7, and 415 ml/g dry resin, respectively. The corresponding values reported for Dowex(TM)-1 x 8 are 4.98, 15.4, and 135 ml/g dry resin, respectively. Reillex(TM)-HPQ is superior for TcO4- separation under these conditions. The detailed behavior of the system can be best described by assuming that the acid, HTcO4, is formed with a derived acid dissociation constant (K(a)) of 4.02 M.