Abstract
Abstract A method of preconcentrating cesium-137 from seawater using a resorcinol-formaldehyde resin, which enables one to optimize the ecological monitoring procedure, has been suggested. Studies of sorption of cesium-137 from seawater by resorcinol-formaldehyde resin have been performed, and it has been demonstrated that the cation exchanger is characterized by high selectivity with respect to cesium-137. It was found that the selectivity depended on the temperature of resin solidification and the seawater pH value. The maximal value of the cesium-137 distribution coefficient is equal to 4.1–4.5×103 cm3 g−1. Under dynamic conditions, the ion-exchange resin capacity is 310–910 bed volumes depending on the seawater pH, whereas the efficiency of cesium removal exceeds 95%. The removal of more than 95% of cesium-137 has been attained using 1–3 M solutions of nitric acid: here, the eluate volume was 8–8.4 bed volumes. Application of 3 M solution of nitric acid results in resin degradation with the release of gaseous products.
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