Abstract
A number of laboratory studies of the bio-availability of sediment-bound metals have been reported. For example, cadmium bound to hydrous iron oxide was available to clams but the presence of organic material on the sediment inhibited cadmium uptake. Similarly the bio-availability of silver, zinc and cobalt bound to a variety of sediments has been studied. Silver was most readily assimilated by clams when the metal was associated with calcium carbonate or manganese oxide. When the metal was bound to biogenic calcium carbonate (crushed clam shells), iron oxides or organic sediments, uptake by the clams was much lower. We now report the bio-availability of cadmium (present as Cd/sup 2/+) to the edible cockle, Cerastoderma edule, from the four sediments: iron oxide, manganese oxide, calcium carbonate and biogenic calcium carbonate.
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