Comparative Uptake and Elimination of Radiocobalt in Organic Complexed and lonic Forms by Mussel, Mytilisepta virgatus
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The uptake and elimination of radiocobalt in organic complexed and ionic forms by mussel, Mytilisepta virgatus were studied under laboratory conditions. The ^<57>Co-trisglycinato complex and ^<60>Co in CoCl_2 were used as tracers for organic complexed and ionic cobalt, respectively. The physico-chemical characteristics of both the radiocobalt in rearing waters were also investigated. Most of the cobalt, not only ionic but also organic complexed are of quite soluble form in seawater. The dominant species in ionic ^<60>Co was cationic, while that in ^<57>Co-trisglycinato complex was almost neutral. Neither ^<57>Co-trisglycinato complex nor ionic ^<60>Co in seawater was adsorbed on Amberlite XAD-2 resin, however, ionic ^<60>Co was adsorbed slightly on activated carbon and much more adsorption was observed for ^<57>Co-trisglycinato complex. The rates of uptake, the turnover rates and the concentration factors for ^<57>Co-trisglycinato complex in both the soft parts and the shell of mussel were smaller than those in ionic ^<60>Co from the analysis based on an exponential model. In the uptake experiments, the exchanged cobalt in the soft parts of mussel could be calculated to be 0.26% for ^<57>Co-trisglycinato complex and 1.93% for ionic ^<60>Co at the equilibrium state, respectively. The whole-body elimina-tion curves of both the radiocobalt at least consisted of the initial short component and the following long one. The elimination of ^<57>Co-trisglycinato complex was larger than that of ionic ^<60>Co. Mass balance calculations at the conclusion of the uptake experiments showed a remarkable difference in the distribution between the radiocobalt in ^<57>Co-trisglycinato complex and ionic ^<60>Co in the systems.
- 日本放射線影響学会の論文
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