To clarify the effect of chemical form on the accumulation of Co by organisms, a rearing experiment was performed, using
60 Co (CoCl
2) as an inorganic compound and
57 Co cyanocobalamin as an organic one. The concentration factor of inorganin
60 Co for
Gomphina melanaegis was calculated to be 360 and that of organic
57 Co was 650. The effect of the difference of chemical form was not large in the accumulation of Co by bivalves. The excretion curveof
60 Co consisted of one component, while that of
57 Co by bivalves. The effective half of
60 Co was 31 days and that fo the longer component of
57 Co in the body of
G. melanegis was 98 days. A remarkably different distribution of Co was observed in the gills, liver, and kidney, suggesting different metabolism processes dus to the chemical forms in the organs of the bivalves.
On the gel filtration profile of Co in the liver of
G. melanaegis, inorganic
60 Co was incorporated in two constituents and organic
57 Co was in one compounent. Four species of bivalves
G. melanaegis, Tridacna crocea, Spisula sachalinensis and
Patinopecten yessoensis showed two peaks of
60 Co in the gel filtration profiles of their livers, while
Anadara broughtonii and
japonica showed three peaks.
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