アワビのコバルト蓄積に及ぼす化学形・蓄積経路の影響〔英文〕

概要

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Although contamination of the abalone by radioactive cobalt is caused by its accumulation througy the 2 intake pathways (from sea water and from food algae), the contribution of each pathway to the total accumulation of the element remains unknown. While, the effect of chemical forms of the element is not solved yet. Therefore, we examined the uptake of cyanocobalamin (57Co) or ionic cobalt (60Co) by the abalone from sea water and from 3 species of marine algae Ulva pertusa, Eisenia bicyclis and Chondrus ocellatus. The excretion was also examined. The abalone accumulated cyanocobalamin (57Co) from sea water approximately 5 times more than ionic cobalt (60Co) at the equilibrium and also it absorbed cyanocobalamin (57Co) 6-16 times more than ionic cobalt (60Co) from the food algae. Cyanocobalamin (57Co) stayed in the abalone a bount 2 times longer than ionic cobalt (60Co). Whereas, the abalone accumulated much more cobalt in both chemical forms from sea water than from food algae except Ulva pertusa. Therefore, it was concluded that when the abalone lived mainly on Eisenia bicyclis which was its favorite food, the influence of food on the accumulation of radioactive cobalt by the abalone coule be negligible.
日本水産學會の論文