Study on the chemical forms of radionuclides in seawater—I |
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| Authors: | Shigeki Hirano Taku Koyanagi |
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| Institution: | (1) Division of Marine Radioecology, Nakaminato Laboratory, National Institute of Radiological Sciences, Isozaki, Nakaminato, 311-12 Ibaraki, Japan |
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| Abstract: | The stability constants for sulfate, chloride and hydroxide ions with cerium (III) in the solution at ionic strength of 0.67 have been determined by cation exchange method, the values of
1 and
2 for sulfate complexes of cerium being 40±13 and 453±140, respectively and those for chloride complexes being 1.28±0.23 and 0.56±0.076, respectively. The values of
1,
2 and
3 for hydroxide complexes of cerium were (4.5±0.9)×107, (3.3±0.7)×1014 and (1.8±0.7)×1023, respectively.Using the above constants the ratios of individual chemical species of144Ce were calculated in a solution at ionic strength of 0.67 containing sulfate and chloride ions approximately the same as in seawater of 35 %. The result of calculation indicates that the dominant species of144Ce in this solution is Ce(OH)3
0 at pH 8. |
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