It is generally difficult to concentrate trace amounts of metals present in sea water because of the high salt concentration. Co-precipitation with ferric hydroxide has been commonly used for this purpose.
The method reported here is based on the fact that radionuclides in a solution can be adsorbed on “ferric hydroxide-cation exchange resin”.
The resin was prepared by converting a hydrogen form of Dowex 50 W, X 8, to ferric form, and then transforming it to ferric hydroxide in the resin by adding ammonia water.
Experiments were carried out by batch method: 50 m
l of sea water containing radionuclides were shaken with 0.5 g of air-dried “resin”.
144Ce,
95Zr and
106Ru were quantitatively adsorbed on the “resin”, while
85Sr and
137Cs were adsorbed by about 35 and 15% respectively.
The “resin” could also be applied to the concentration of radionuclides in natural waters.
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