Accumulation of Co by Abalone I-Effect of chemical form

The appearance of radioactive Co in the liver of abalone from sea water was examined to consider the effect of chemical forms of Co(CoCl2 and cyanocobalamin; vitamin B12) in sea water upon the metabolisms in marine organisms. Organic 57Co(cyanocobalamin) from sea water appeared in the liver of abalone combining with a constituent with a molecular weight of 4 × 104. The constituent had the activity of vitamin B12, while inorganic 60Co(CoCl2) appeared combining with three constituents with molecular weights more than or equal to 1.5 × 106, 7 × 103 and less than or equal to 1.5 × 103 which did not show the activities of vitamin B12. The effect of chemical forms of Co in sea water is significant in its accumulation by some species of marine organisms.