Study on the chemical forms of radionuclides in seawater-III complexes of60Co with amino acids
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Stability constants were determined for60Co (II)-amino acid complexes in sodium perchlorate media at an ionic strengthμ=0.67, using cation exchange resins. Stability constants were, for Co(II)-phenylalanine, logβ1=4.4, logβ2=8.2, logβ3=11.7, for Co(II)-histidine, logβ1=7.4. for Co(II)-valine, logβ1=4.3, logβ2=8.5, for Co(II)-proline, logβ1=4.1, and for Co(II)-tyrosine, logβ1=7.2, respectively. The abundance of Co(II)-amino acid complexes in seawater was calculated from these stability constants on the basis of chemical equilibrium, assuming the concentration of individual amino acid to be 10−7 to 10−8 mol l−1. It was inferred that the Co(II)-amino acid complexes are probably not formed abundantly in seawater while inorganic species of60Co(II) may still be dominant for a short period of time after discharge into seawater as liquid waste.
KeywordsSodium Tyrosine Proline Radionuclide Histidine
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