Ion exchange of ~90Sr and ~137Cs into l-vinyl-2-pyrrolidone - divinylbenzene cation-exchange resin

摘要

Radiotracer batch ion-exchange experiments were employed to investigate the uptake of ~90Sr and ~137Cs radioisotopes by various cation-exchanged forms of a 30% cross-linked macroporous 1-vinyl-2-pyrrolidone-divinylbenzene cation-exchange resin with 1.37 ml g~(-1)pore volume,0.0232 mum pore diameter and 271.2 m~2 g~(-1)surface area.The uptake of ~90Sr and ~137Cs was determined by taking liquid aliquots at various time intervals from solutions over solids.The volume-to-solid ratio was kept at 200.The results of kinetic experiments for the carrier-free ~90Sr and ~137Cs were evident in all cationic forms of the resin.The percentage uptake and distribution coefficient K_d values with carrier(0.005 M SrCl_2 and 0.01 M CsCl)concentrations were also determined,and the best results were obtained from the Li~+ and H~+ forms of the resin.Cerenkov counting(beta~--counting)was used to observe the initial and final radioactivity in the liquid phase.All the experiments were carried out at room temperature and the radioactivity in each case was corrected for the background counts.