摘要：An analytical method for radioactive cobalt and iron in marine organisms was developed by the use of ion exchange separation and electrodeposition. The radioactive cobalt and iron were adsorbed on an anion exchange resin and eluted, the former with 4 N HCl, and the latter with 0.6 N HCl. Each of these effluents was evaporated to dryness. The residue containing radioactive cobalt was dissolved in ammonium water containing ammonium chloride and sodium bisulfite, and radioactive cobalt was electrodeposited on a copper plate at 0.5 A/cm2, in order to measure the radioactivity. The other residue containing radioactive iron was dissolved in a solution of ammonium oxalate plus citric acid, and radioactive iron was electrodeposited on a copper plate at 0.2 A/cm2. The radiochemical recovery of both nuclides by this method was more than 97%. Using this method analysis of radioactive cobalt and iron in seaweed obtained at the Tsuruga coast near the atomic power plant was carried out. From the result of the measurement of radioactivities, it was found that the concentrations of radioactive cobalt and iron were lower than 2 pCi/g ash.
