Study on the chemical forms of radionuclides in seawater. I. Chloride, sulfate and hydroxide complexes of 144Ce.:Chloride, Sulfate and Hydroxide Complexes of 144Ce

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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 ofβ1, andβ2 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 β1, β2 andβ3 for hydroxide complexes of cerium were (4.5± 0.9)×107, (3.3±0.7)×1014and (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)30at pH 8.
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