Abstract
ABSTRACT The Reillex™-HPQ anion exchange resin has a good potential toward the pretreatment of liquid nuclear wastes. In this work, a short procedure was devised to convert 99.997% of the resin from its chloride form to the nitrate form as a foundation of all quantitative measurements. It is determined that the resin can be dried to a constant mass at 60°C in 28 hours and the electrostatic effect during weighings can hence be eliminated. The weight ratio between resins dried at 110°C and 60°C is 0.927±0.005 (one standard deviation). The resin has an apparent pKa of 3.36±0.05. The sorption capacity from primarily the weakly basic ionogenic sites (RNH+) is 1.08±0.04 meq/g for resins dried at 60°C. In highly basic solutions, the resin became unstable and started to release a substantial amount of methanol. In nitric acid solutions, the selectivity sequence of halide ions versus nitrate and pertechnetate ions is: TcO4 − > I− > NO3 − > Br− > Cl− > F−. The HPQ resin showed no sorption of fluoride ions. Although...
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