The Occurrence of Tantalum in Some Marine Organisms

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Abstract
Determinations have been made, by neutron activation analysis, of the concentrations of tantalum in the tissues of some common crustaceans, molluscs, echinoderms and tunicates of coastal waters of southern England. The concentrations ranged from less than 0·01 ppm dry weight in the muscle of Mytilus edulis to 2 ppm dry weight in Neomysis integer. Two ascidian species showed concentrations of about 0·2 ppm dry weight in the whole organism. The measurements support the generalised concentration factors which have previously been assumed in assessing the radiobiological significance of discharges of radioactive tantalum to the marine environment.